This is an automated email from the ASF dual-hosted git repository.

btellier pushed a commit to branch master
in repository https://gitbox.apache.org/repos/asf/james-project.git

commit 70265a4932ccd15cf22f0a02948442551840ad61
Author: Rene Cordier <rcord...@linagora.com>
AuthorDate: Mon Nov 11 16:23:16 2019 +0700

    [Refactoring] Moving tests in mailbox.model to JUnit 5
---
 .../james/mailbox/model/AttachmentIdTest.java      |  18 +-
 .../apache/james/mailbox/model/AttachmentTest.java |  83 +++---
 .../org/apache/james/mailbox/model/BlobIdTest.java |  16 +-
 .../org/apache/james/mailbox/model/BlobTest.java   |  14 +-
 .../org/apache/james/mailbox/model/CidTest.java    | 130 +++++----
 .../model/ComposedMessageIdWithMetaDataTest.java   |  52 ++--
 .../mailbox/model/MailboxACLEntryKeyTest.java      |  45 ++-
 .../apache/james/mailbox/model/MailboxACLTest.java |  46 +--
 .../mailbox/model/MailboxAnnotationKeyTest.java    | 128 +++++----
 .../james/mailbox/model/MailboxAnnotationTest.java |  36 ++-
 .../james/mailbox/model/MailboxAssertTests.java    |  49 ++--
 .../james/mailbox/model/MailboxCountersTest.java   |   6 +-
 .../james/mailbox/model/MailboxPathTest.java       |  50 ++--
 .../james/mailbox/model/MessageAttachmentTest.java |  35 +--
 .../james/mailbox/model/MessageIdDtoTest.java      |  17 +-
 .../james/mailbox/model/MessageRangeTest.java      | 309 ++++++++++-----------
 .../model/MultimailboxesSearchQueryTest.java       |  30 +-
 .../org/apache/james/mailbox/model/QuotaTest.java  |  28 +-
 .../james/mailbox/model/Rfc4314RightsTest.java     |  83 +++---
 .../james/mailbox/model/SearchQueryTest.java       |   8 +-
 .../james/mailbox/model/UpdatedFlagsTest.java      |  30 +-
 21 files changed, 628 insertions(+), 585 deletions(-)

diff --git 
a/mailbox/api/src/test/java/org/apache/james/mailbox/model/AttachmentIdTest.java
 
b/mailbox/api/src/test/java/org/apache/james/mailbox/model/AttachmentIdTest.java
index c69e9ce..d6f4565 100644
--- 
a/mailbox/api/src/test/java/org/apache/james/mailbox/model/AttachmentIdTest.java
+++ 
b/mailbox/api/src/test/java/org/apache/james/mailbox/model/AttachmentIdTest.java
@@ -24,50 +24,50 @@ import static 
org.assertj.core.api.Assertions.assertThatThrownBy;
 
 import java.util.UUID;
 
-import org.junit.Test;
+import org.junit.jupiter.api.Test;
 
-public class AttachmentIdTest {
+class AttachmentIdTest {
 
     @Test
-    public void randomShouldGenerateDifferentIds() {
+    void randomShouldGenerateDifferentIds() {
         AttachmentId attachmentId = AttachmentId.random();
         AttachmentId attachmentId2 = AttachmentId.random();
         assertThat(attachmentId.getId()).isNotEqualTo(attachmentId2.getId());
     }
 
     @Test
-    public void fromShouldThrowWhenIdIsNull() {
+    void fromShouldThrowWhenIdIsNull() {
         String value = null;
         assertThatThrownBy(() -> 
AttachmentId.from(value)).isInstanceOf(NullPointerException.class);
     }
 
     @Test
-    public void fromShouldThrowWhenBlobIdIsNull() {
+    void fromShouldThrowWhenBlobIdIsNull() {
         BlobId value = null;
         assertThatThrownBy(() -> 
AttachmentId.from(value)).isInstanceOf(NullPointerException.class);
     }
 
     @Test
-    public void fromShouldThrowWhenIdIsEmpty() {
+    void fromShouldThrowWhenIdIsEmpty() {
         assertThatThrownBy(() -> 
AttachmentId.from("")).isInstanceOf(IllegalArgumentException.class);
     }
 
     @Test
-    public void fromStringShouldWork() {
+    void fromStringShouldWork() {
         String expectedId = "f07e5a815613c5abeddc4b682247a4c42d8a95df";
         AttachmentId attachmentId = AttachmentId.from(expectedId);
         assertThat(attachmentId.getId()).isEqualTo(expectedId);
     }
 
     @Test
-    public void fromBlobIdShouldWork() {
+    void fromBlobIdShouldWork() {
         String expectedId = "f07e5a815613c5abeddc4b682247a4c42d8a95df";
         AttachmentId attachmentId = 
AttachmentId.from(BlobId.fromString(expectedId));
         assertThat(attachmentId.getId()).isEqualTo(expectedId);
     }
 
     @Test
-    public void asUUIDShouldReturnAValidUUID() {
+    void asUUIDShouldReturnAValidUUID() {
         AttachmentId attachmentId = AttachmentId.from("magic");
 
         assertThat(attachmentId.asUUID())
diff --git 
a/mailbox/api/src/test/java/org/apache/james/mailbox/model/AttachmentTest.java 
b/mailbox/api/src/test/java/org/apache/james/mailbox/model/AttachmentTest.java
index d73e073..69c5636 100644
--- 
a/mailbox/api/src/test/java/org/apache/james/mailbox/model/AttachmentTest.java
+++ 
b/mailbox/api/src/test/java/org/apache/james/mailbox/model/AttachmentTest.java
@@ -21,20 +21,21 @@
 package org.apache.james.mailbox.model;
 
 import static org.assertj.core.api.Assertions.assertThat;
+import static org.assertj.core.api.Assertions.assertThatThrownBy;
 
 import java.io.InputStream;
 import java.nio.charset.Charset;
 import java.nio.charset.StandardCharsets;
 
 import org.apache.commons.io.IOUtils;
-import org.junit.Test;
+import org.junit.jupiter.api.Test;
 
-public class AttachmentTest {
+class AttachmentTest {
 
     private static Charset CHARSET = StandardCharsets.UTF_8;
 
     @Test
-    public void streamShouldBeConsumedOneTime() throws Exception {
+    void streamShouldBeConsumedOneTime() throws Exception {
         String input = "mystream";
         Attachment attachment = Attachment.builder()
                 .bytes(input.getBytes(CHARSET))
@@ -47,7 +48,7 @@ public class AttachmentTest {
     }
 
     @Test
-    public void getByteShouldReturnByteArrayRepresentingTheAttachment() {
+    void getByteShouldReturnByteArrayRepresentingTheAttachment() {
         String input = "mystream";
         Attachment attachment = Attachment.builder()
             .bytes(input.getBytes(CHARSET))
@@ -59,7 +60,7 @@ public class AttachmentTest {
     }
 
     @Test
-    public void streamShouldBeConsumedMoreThanOneTime() throws Exception {
+    void streamShouldBeConsumedMoreThanOneTime() throws Exception {
         String input = "mystream";
         Attachment attachment = Attachment.builder()
                 .bytes(input.getBytes(CHARSET))
@@ -72,52 +73,60 @@ public class AttachmentTest {
         assertThat(IOUtils.toString(stream, CHARSET)).isEqualTo(input);
     }
 
-    @Test (expected = IllegalArgumentException.class)
-    public void builderShouldThrowWhenAttachmentIdIsNull() {
-        Attachment.builder()
-            .attachmentId(null);
+    @Test
+    void builderShouldThrowWhenAttachmentIdIsNull() {
+        assertThatThrownBy(() -> Attachment.builder()
+                .attachmentId(null))
+            .isInstanceOf(IllegalArgumentException.class);
     }
 
-    @Test (expected = IllegalArgumentException.class)
-    public void builderShouldThrowWhenBytesIsNull() {
-        Attachment.builder()
-            .bytes(null);
+    @Test
+    void builderShouldThrowWhenBytesIsNull() {
+        assertThatThrownBy(() -> Attachment.builder()
+                .bytes(null))
+            .isInstanceOf(IllegalArgumentException.class);
     }
 
-    @Test (expected = IllegalArgumentException.class)
-    public void builderShouldThrowWhenTypeIsNull() {
-        Attachment.builder()
-            .type(null);
+    @Test
+    void builderShouldThrowWhenTypeIsNull() {
+        assertThatThrownBy(() -> Attachment.builder()
+                .type(null))
+            .isInstanceOf(IllegalArgumentException.class);
     }
 
-    @Test (expected = IllegalArgumentException.class)
-    public void builderShouldThrowWhenTypeIsEmpty() {
-        Attachment.builder()
-            .type("");
+    @Test
+    void builderShouldThrowWhenTypeIsEmpty() {
+        assertThatThrownBy(() -> Attachment.builder()
+                .type(""))
+            .isInstanceOf(IllegalArgumentException.class);
     }
 
-    @Test (expected = IllegalStateException.class)
-    public void buildShouldThrowWhenAttachmentIdIsNotProvided() {
-        Attachment.builder().build();
+    @Test
+    void buildShouldThrowWhenAttachmentIdIsNotProvided() {
+        assertThatThrownBy(() -> Attachment.builder()
+                .build())
+            .isInstanceOf(IllegalStateException.class);
     }
 
-    @Test (expected = IllegalStateException.class)
-    public void buildShouldThrowWhenBytesIsNotProvided() {
-        Attachment.builder()
-            .attachmentId(AttachmentId.random())
-            .build();
+    @Test
+    void buildShouldThrowWhenBytesIsNotProvided() {
+        assertThatThrownBy(() -> Attachment.builder()
+                .attachmentId(AttachmentId.random())
+                .build())
+            .isInstanceOf(IllegalStateException.class);
     }
 
-    @Test (expected = IllegalStateException.class)
-    public void buildShouldThrowWhenTypeIsNotProvided() {
-        Attachment.builder()
-            .attachmentId(AttachmentId.random())
-            .bytes("mystream".getBytes(CHARSET))
-            .build();
+    @Test
+    void buildShouldThrowWhenTypeIsNotProvided() {
+        assertThatThrownBy(() -> Attachment.builder()
+                .attachmentId(AttachmentId.random())
+                .bytes("mystream".getBytes(CHARSET))
+                .build())
+            .isInstanceOf(IllegalStateException.class);
     }
 
     @Test
-    public void buildShouldSetTheSize() {
+    void buildShouldSetTheSize() {
         String input = "mystream";
         Attachment attachment = Attachment.builder()
                 .bytes(input.getBytes(CHARSET))
@@ -128,7 +137,7 @@ public class AttachmentTest {
     }
 
     @Test
-    public void toBlobShouldGenerateTheAttachmentBlob() {
+    void toBlobShouldGenerateTheAttachmentBlob() {
         byte[] bytes = "mystream".getBytes(CHARSET);
         String content = "content";
         Attachment attachment = Attachment.builder()
diff --git 
a/mailbox/api/src/test/java/org/apache/james/mailbox/model/BlobIdTest.java 
b/mailbox/api/src/test/java/org/apache/james/mailbox/model/BlobIdTest.java
index f91b9c7..1d4e3b2 100644
--- a/mailbox/api/src/test/java/org/apache/james/mailbox/model/BlobIdTest.java
+++ b/mailbox/api/src/test/java/org/apache/james/mailbox/model/BlobIdTest.java
@@ -24,44 +24,44 @@ import static 
org.assertj.core.api.Assertions.assertThatThrownBy;
 
 import java.nio.charset.StandardCharsets;
 
-import org.junit.Test;
+import org.junit.jupiter.api.Test;
 
 import nl.jqno.equalsverifier.EqualsVerifier;
 
-public class BlobIdTest {
+class BlobIdTest {
 
     @Test
-    public void shouldMatchBeanContact() {
+    void shouldMatchBeanContact() {
         EqualsVerifier.forClass(BlobId.class)
             .verify();
     }
 
     @Test
-    public void fromStringShouldThrowOnNull() {
+    void fromStringShouldThrowOnNull() {
         assertThatThrownBy(() -> BlobId.fromString(null))
             .isInstanceOf(IllegalArgumentException.class);
     }
 
     @Test
-    public void fromStringShouldThrowOnEmpty() {
+    void fromStringShouldThrowOnEmpty() {
         assertThatThrownBy(() -> BlobId.fromString(""))
             .isInstanceOf(IllegalArgumentException.class);
     }
 
     @Test
-    public void asStringShouldReturnUnderlyingId() {
+    void asStringShouldReturnUnderlyingId() {
         assertThat(BlobId.fromString("abc").asString())
             .isEqualTo("abc");
     }
 
     @Test
-    public void fromBytesShouldProduceASHA256() {
+    void fromBytesShouldProduceASHA256() {
         
assertThat(BlobId.fromBytes("abc".getBytes(StandardCharsets.UTF_8)).asString())
             
.isEqualTo("ba7816bf8f01cfea414140de5dae2223b00361a396177a9cb410ff61f20015ad");
     }
 
     @Test
-    public void fromBytesShouldCalculateSameSha256() {
+    void fromBytesShouldCalculateSameSha256() {
         byte[] bytes = "abc".getBytes(StandardCharsets.UTF_8);
 
         assertThat(BlobId.fromBytes(bytes))
diff --git 
a/mailbox/api/src/test/java/org/apache/james/mailbox/model/BlobTest.java 
b/mailbox/api/src/test/java/org/apache/james/mailbox/model/BlobTest.java
index 0c306d4..b19219d 100644
--- a/mailbox/api/src/test/java/org/apache/james/mailbox/model/BlobTest.java
+++ b/mailbox/api/src/test/java/org/apache/james/mailbox/model/BlobTest.java
@@ -24,25 +24,25 @@ import static 
org.assertj.core.api.Assertions.assertThatThrownBy;
 
 import java.nio.charset.StandardCharsets;
 
-import org.junit.Test;
+import org.junit.jupiter.api.Test;
 
 import nl.jqno.equalsverifier.EqualsVerifier;
 
-public class BlobTest {
+class BlobTest {
 
     public static final BlobId ID = BlobId.fromString("123");
     public static final String CONTENT_TYPE = "text/plain";
     public static final byte[] PAYLOAD = 
"abc".getBytes(StandardCharsets.UTF_8);
 
     @Test
-    public void shouldMatchBeanContract() {
+    void shouldMatchBeanContract() {
         EqualsVerifier.forClass(Blob.class)
             .withIgnoredFields("payload", "size")
             .verify();
     }
 
     @Test
-    public void buildShouldConstructValidBlob() {
+    void buildShouldConstructValidBlob() {
         assertThat(
             Blob.builder()
                 .id(ID)
@@ -54,7 +54,7 @@ public class BlobTest {
     }
 
     @Test
-    public void buildShouldThrowOnMissingBlobId() {
+    void buildShouldThrowOnMissingBlobId() {
         assertThatThrownBy(() ->
             Blob.builder()
                 .contentType(CONTENT_TYPE)
@@ -64,7 +64,7 @@ public class BlobTest {
     }
 
     @Test
-    public void buildShouldThrowOnMissingContentType() {
+    void buildShouldThrowOnMissingContentType() {
         assertThatThrownBy(() ->
             Blob.builder()
                 .id(ID)
@@ -74,7 +74,7 @@ public class BlobTest {
     }
 
     @Test
-    public void buildShouldThrowOnMissingPayload() {
+    void buildShouldThrowOnMissingPayload() {
         assertThatThrownBy(() ->
             Blob.builder()
                 .id(ID)
diff --git 
a/mailbox/api/src/test/java/org/apache/james/mailbox/model/CidTest.java 
b/mailbox/api/src/test/java/org/apache/james/mailbox/model/CidTest.java
index 3939a39..1e1c59b 100644
--- a/mailbox/api/src/test/java/org/apache/james/mailbox/model/CidTest.java
+++ b/mailbox/api/src/test/java/org/apache/james/mailbox/model/CidTest.java
@@ -20,75 +20,72 @@
 package org.apache.james.mailbox.model;
 
 import static org.assertj.core.api.Assertions.assertThat;
+import static org.assertj.core.api.Assertions.assertThatThrownBy;
 
 import java.util.Optional;
 
-import org.junit.Rule;
-import org.junit.Test;
-import org.junit.rules.ExpectedException;
+import org.junit.jupiter.api.Test;
 
 import nl.jqno.equalsverifier.EqualsVerifier;
 
-public class CidTest {
-
-    @Rule public ExpectedException expectedException = 
ExpectedException.none();
+class CidTest {
 
     @Test
-    public void fromShouldThrowWhenNull() {
-        expectedException.expect(IllegalArgumentException.class);
-        Cid.from(null);
+    void fromShouldThrowWhenNull() {
+        assertThatThrownBy(() -> Cid.from(null))
+            .isInstanceOf(IllegalArgumentException.class);
     }
 
     @Test
-    public void fromShouldThrowWhenEmpty() {
-        expectedException.expect(IllegalArgumentException.class);
-        Cid.from("");
+    void fromShouldThrowWhenEmpty() {
+        assertThatThrownBy(() -> Cid.from(""))
+            .isInstanceOf(IllegalArgumentException.class);
     }
 
     @Test
-    public void fromShouldThrowWhenBlank() {
-        expectedException.expect(IllegalArgumentException.class);
-        Cid.from("    ");
+    void fromShouldThrowWhenBlank() {
+        assertThatThrownBy(() -> Cid.from("    "))
+            .isInstanceOf(IllegalArgumentException.class);
     }
 
     @Test
-    public void fromShouldThrowWhenEmptyAfterRemoveTags() {
-        expectedException.expect(IllegalArgumentException.class);
-        Cid.from("<>");
+    void fromShouldThrowWhenEmptyAfterRemoveTags() {
+        assertThatThrownBy(() -> Cid.from("<>"))
+            .isInstanceOf(IllegalArgumentException.class);
     }
 
     @Test
-    public void fromShouldThrowWhenBlankAfterRemoveTags() {
-        expectedException.expect(IllegalArgumentException.class);
-        Cid.from("<   >");
+    void fromShouldThrowWhenBlankAfterRemoveTags() {
+        assertThatThrownBy(() -> Cid.from("<   >"))
+            .isInstanceOf(IllegalArgumentException.class);
     }
 
     @Test
-    public void fromShouldRemoveTagsWhenExists() {
+    void fromShouldRemoveTagsWhenExists() {
         Cid cid = Cid.from("<123>");
         assertThat(cid.getValue()).isEqualTo("123");
     }
 
     @Test
-    public void fromShouldNotRemoveTagsWhenNone() {
+    void fromShouldNotRemoveTagsWhenNone() {
         Cid cid = Cid.from("123");
         assertThat(cid.getValue()).isEqualTo("123");
     }
 
     @Test
-    public void fromShouldNotRemoveTagsWhenNotEndTag() {
+    void fromShouldNotRemoveTagsWhenNotEndTag() {
         Cid cid = Cid.from("<123");
         assertThat(cid.getValue()).isEqualTo("<123");
     }
 
     @Test
-    public void fromShouldNotRemoveTagsWhenNotStartTag() {
+    void fromShouldNotRemoveTagsWhenNotStartTag() {
         Cid cid = Cid.from("123>");
         assertThat(cid.getValue()).isEqualTo("123>");
     }
 
     @Test
-    public void fromRelaxedNoUnwrapShouldReturnAbsentWhenNull() {
+    void fromRelaxedNoUnwrapShouldReturnAbsentWhenNull() {
         assertThat(Cid.parser()
             .relaxed()
             .parse(null))
@@ -96,7 +93,7 @@ public class CidTest {
     }
 
     @Test
-    public void fromRelaxedNoUnwrapShouldReturnAbsentWhenEmpty() {
+    void fromRelaxedNoUnwrapShouldReturnAbsentWhenEmpty() {
         assertThat(Cid.parser()
             .relaxed()
             .parse(""))
@@ -104,7 +101,7 @@ public class CidTest {
     }
 
     @Test
-    public void fromRelaxedNoUnwrapShouldReturnAbsentWhenBlank() {
+    void fromRelaxedNoUnwrapShouldReturnAbsentWhenBlank() {
         assertThat(Cid.parser()
             .relaxed()
             .parse("     "))
@@ -112,7 +109,7 @@ public class CidTest {
     }
 
     @Test
-    public void fromRelaxedNoUnwrapShouldReturnCidWhenEmptyAfterRemoveTags() {
+    void fromRelaxedNoUnwrapShouldReturnCidWhenEmptyAfterRemoveTags() {
         Optional<Cid> actual = Cid.parser()
             .relaxed()
             .parse("<>");
@@ -121,7 +118,7 @@ public class CidTest {
     }
 
     @Test
-    public void fromRelaxedNoUnwrapShouldReturnCidWhenBlankAfterRemoveTags() {
+    void fromRelaxedNoUnwrapShouldReturnCidWhenBlankAfterRemoveTags() {
         Optional<Cid> actual = Cid.parser()
             .relaxed()
             .parse("<   >");
@@ -130,7 +127,7 @@ public class CidTest {
     }
 
     @Test
-    public void fromRelaxedNoUnwrapShouldNotRemoveTagsWhenExists() {
+    void fromRelaxedNoUnwrapShouldNotRemoveTagsWhenExists() {
         Optional<Cid> actual = Cid.parser()
             .relaxed()
             .parse("<123>");
@@ -139,7 +136,7 @@ public class CidTest {
     }
 
     @Test
-    public void fromRelaxedNoUnwrapShouldNotRemoveTagsWhenNone() {
+    void fromRelaxedNoUnwrapShouldNotRemoveTagsWhenNone() {
         assertThat(Cid.parser()
             .relaxed()
             .parse("123"))
@@ -147,7 +144,7 @@ public class CidTest {
     }
 
     @Test
-    public void fromRelaxedNoUnwrapShouldNotRemoveTagsWhenNotEndTag() {
+    void fromRelaxedNoUnwrapShouldNotRemoveTagsWhenNotEndTag() {
         assertThat(Cid.parser()
             .relaxed()
             .parse("<123"))
@@ -155,7 +152,7 @@ public class CidTest {
     }
 
     @Test
-    public void fromRelaxedNoUnwrapShouldNotRemoveTagsWhenNotStartTag() {
+    void fromRelaxedNoUnwrapShouldNotRemoveTagsWhenNotStartTag() {
         assertThat(Cid.parser()
             .relaxed()
             .parse("123>"))
@@ -164,7 +161,7 @@ public class CidTest {
 
 
     @Test
-    public void fromRelaxedUnwrapShouldReturnAbsentWhenNull() {
+    void fromRelaxedUnwrapShouldReturnAbsentWhenNull() {
         assertThat(Cid.parser()
             .relaxed()
             .unwrap()
@@ -173,7 +170,7 @@ public class CidTest {
     }
 
     @Test
-    public void fromRelaxedUnwrapShouldReturnAbsentWhenEmpty() {
+    void fromRelaxedUnwrapShouldReturnAbsentWhenEmpty() {
         assertThat(Cid.parser()
             .relaxed()
             .unwrap()
@@ -182,7 +179,7 @@ public class CidTest {
     }
 
     @Test
-    public void fromRelaxedUnwrapShouldReturnAbsentWhenBlank() {
+    void fromRelaxedUnwrapShouldReturnAbsentWhenBlank() {
         assertThat(Cid.parser()
             .relaxed()
             .unwrap()
@@ -191,7 +188,7 @@ public class CidTest {
     }
 
     @Test
-    public void fromRelaxedUnwrapShouldReturnAbsentWhenEmptyAfterRemoveTags() {
+    void fromRelaxedUnwrapShouldReturnAbsentWhenEmptyAfterRemoveTags() {
         assertThat(Cid.parser()
             .relaxed()
             .unwrap()
@@ -200,7 +197,7 @@ public class CidTest {
     }
 
     @Test
-    public void fromRelaxedUnwrapShouldReturnAbsentWhenBlankAfterRemoveTags() {
+    void fromRelaxedUnwrapShouldReturnAbsentWhenBlankAfterRemoveTags() {
         assertThat(Cid.parser()
             .relaxed()
             .unwrap()
@@ -209,7 +206,7 @@ public class CidTest {
     }
 
     @Test
-    public void fromRelaxedUnwrapShouldRemoveTagsWhenExists() {
+    void fromRelaxedUnwrapShouldRemoveTagsWhenExists() {
         Optional<Cid> actual = Cid.parser()
             .relaxed()
             .unwrap()
@@ -219,7 +216,7 @@ public class CidTest {
     }
 
     @Test
-    public void fromRelaxedUnwrapShouldNotRemoveTagsWhenNone() {
+    void fromRelaxedUnwrapShouldNotRemoveTagsWhenNone() {
         assertThat(Cid.parser()
             .relaxed()
             .unwrap()
@@ -228,7 +225,7 @@ public class CidTest {
     }
 
     @Test
-    public void fromRelaxedUnwrapShouldNotRemoveTagsWhenNotEndTag() {
+    void fromRelaxedUnwrapShouldNotRemoveTagsWhenNotEndTag() {
         assertThat(Cid.parser()
             .relaxed()
             .unwrap()
@@ -237,7 +234,7 @@ public class CidTest {
     }
 
     @Test
-    public void fromRelaxedUnwrapShouldNotRemoveTagsWhenNotStartTag() {
+    void fromRelaxedUnwrapShouldNotRemoveTagsWhenNotStartTag() {
         assertThat(Cid.parser()
             .relaxed()
             .unwrap()
@@ -246,34 +243,31 @@ public class CidTest {
     }
 
     @Test
-    public void fromStrictNoUnwrapShouldThrowWhenNull() {
-        expectedException.expect(IllegalArgumentException.class);
-
-        Cid.parser()
-            .strict()
-            .parse(null);
+    void fromStrictNoUnwrapShouldThrowWhenNull() {
+        assertThatThrownBy(() -> Cid.parser()
+                .strict()
+                .parse(null))
+            .isInstanceOf(IllegalArgumentException.class);
     }
 
     @Test
-    public void fromStrictNoUnwrapShouldThrowWhenEmpty() {
-        expectedException.expect(IllegalArgumentException.class);
-
-        Cid.parser()
-            .strict()
-            .parse("");
+    void fromStrictNoUnwrapShouldThrowWhenEmpty() {
+        assertThatThrownBy(() -> Cid.parser()
+                .strict()
+                .parse(""))
+            .isInstanceOf(IllegalArgumentException.class);
     }
 
     @Test
-    public void fromStrinctNoUnwrapShouldThrowWhenBlank() {
-        expectedException.expect(IllegalArgumentException.class);
-
-        Cid.parser()
-            .strict()
-            .parse("   ");
+    void fromStrinctNoUnwrapShouldThrowWhenBlank() {
+        assertThatThrownBy(() -> Cid.parser()
+                .strict()
+                .parse("   "))
+            .isInstanceOf(IllegalArgumentException.class);
     }
 
     @Test
-    public void fromStrictNoUnwrapShouldNotRemoveTagWhenEmptyAfterRemoveTags() 
{
+    void fromStrictNoUnwrapShouldNotRemoveTagWhenEmptyAfterRemoveTags() {
         Optional<Cid> actual = Cid.parser()
             .strict()
             .parse("<>");
@@ -282,7 +276,7 @@ public class CidTest {
     }
 
     @Test
-    public void fromStrictNoUnwrapShouldNotRemoveTagWhenBlankAfterRemoveTags() 
{
+    void fromStrictNoUnwrapShouldNotRemoveTagWhenBlankAfterRemoveTags() {
         Optional<Cid> actual = Cid.parser()
             .strict()
             .parse("<   >");
@@ -291,7 +285,7 @@ public class CidTest {
     }
 
     @Test
-    public void fromStrictNoUnwrapShouldNotRemoveTagsWhenExists() {
+    void fromStrictNoUnwrapShouldNotRemoveTagsWhenExists() {
         Optional<Cid> actual = Cid.parser()
             .strict()
             .parse("<123>");
@@ -300,7 +294,7 @@ public class CidTest {
     }
 
     @Test
-    public void fromStrictNoUnwrapShouldNotRemoveTagsWhenNone() {
+    void fromStrictNoUnwrapShouldNotRemoveTagsWhenNone() {
         assertThat(Cid.parser()
             .strict()
             .parse("123"))
@@ -308,7 +302,7 @@ public class CidTest {
     }
 
     @Test
-    public void fromStrictNoUnwrapShouldNotRemoveTagsWhenNotEndTag() {
+    void fromStrictNoUnwrapShouldNotRemoveTagsWhenNotEndTag() {
         assertThat(Cid.parser()
             .strict()
             .parse("<123"))
@@ -316,7 +310,7 @@ public class CidTest {
     }
 
     @Test
-    public void fromStrictNoUnwrapShouldNotRemoveTagsWhenNotStartTag() {
+    void fromStrictNoUnwrapShouldNotRemoveTagsWhenNotStartTag() {
         assertThat(Cid.parser()
             .strict()
             .parse("123>"))
@@ -324,7 +318,7 @@ public class CidTest {
     }
 
     @Test
-    public void shouldRespectJavaBeanContract() {
+    void shouldRespectJavaBeanContract() {
         EqualsVerifier.forClass(Cid.class).verify();
     }
 }
diff --git 
a/mailbox/api/src/test/java/org/apache/james/mailbox/model/ComposedMessageIdWithMetaDataTest.java
 
b/mailbox/api/src/test/java/org/apache/james/mailbox/model/ComposedMessageIdWithMetaDataTest.java
index 8df2ba4..b120c87 100644
--- 
a/mailbox/api/src/test/java/org/apache/james/mailbox/model/ComposedMessageIdWithMetaDataTest.java
+++ 
b/mailbox/api/src/test/java/org/apache/james/mailbox/model/ComposedMessageIdWithMetaDataTest.java
@@ -19,44 +19,48 @@
 package org.apache.james.mailbox.model;
 
 import static org.assertj.core.api.Assertions.assertThat;
+import static org.assertj.core.api.Assertions.assertThatThrownBy;
 
 import javax.mail.Flags;
 import javax.mail.Flags.Flag;
 
 import org.apache.james.mailbox.MessageUid;
-import org.junit.Test;
+import org.junit.jupiter.api.Test;
 
 import nl.jqno.equalsverifier.EqualsVerifier;
 
-public class ComposedMessageIdWithMetaDataTest {
+class ComposedMessageIdWithMetaDataTest {
 
-    public static final TestId TEST_ID = TestId.of(1L);
-    public static final TestMessageId TEST_MESSAGE_ID = new TestMessageId("2");
-    public static final MessageUid MESSAGE_UID = MessageUid.of(3);
-    public static final ComposedMessageId COMPOSED_MESSAGE_ID = new 
ComposedMessageId(TEST_ID, TEST_MESSAGE_ID, MESSAGE_UID);
+    private static final TestId TEST_ID = TestId.of(1L);
+    private static final TestMessageId TEST_MESSAGE_ID = new 
TestMessageId("2");
+    private static final MessageUid MESSAGE_UID = MessageUid.of(3);
+    private static final ComposedMessageId COMPOSED_MESSAGE_ID = new 
ComposedMessageId(TEST_ID, TEST_MESSAGE_ID, MESSAGE_UID);
 
-    @Test(expected = NullPointerException.class)
-    public void buildShoudThrownWhenComposedMessageIdIsNull() {
-        ComposedMessageIdWithMetaData.builder().build();
+    @Test
+    void buildShoudThrownWhenComposedMessageIdIsNull() {
+        assertThatThrownBy(() -> 
ComposedMessageIdWithMetaData.builder().build())
+            .isInstanceOf(NullPointerException.class);
     }
 
-    @Test(expected = NullPointerException.class)
-    public void buildShoudThrownWhenFlagsIsNull() {
-        ComposedMessageIdWithMetaData.builder()
-            .composedMessageId(COMPOSED_MESSAGE_ID)
-            .build();
+    @Test
+    void buildShoudThrownWhenFlagsIsNull() {
+        assertThatThrownBy(() -> ComposedMessageIdWithMetaData.builder()
+                .composedMessageId(COMPOSED_MESSAGE_ID)
+                .build())
+            .isInstanceOf(NullPointerException.class);
     }
 
-    @Test(expected = NullPointerException.class)
-    public void buildShoudThrownWhenModSeqIsNull() {
-        ComposedMessageIdWithMetaData.builder()
-            .composedMessageId(COMPOSED_MESSAGE_ID)
-            .flags(new Flags())
-            .build();
+    @Test
+    void buildShoudThrownWhenModSeqIsNull() {
+        assertThatThrownBy(() -> ComposedMessageIdWithMetaData.builder()
+                .composedMessageId(COMPOSED_MESSAGE_ID)
+                .flags(new Flags())
+                .build())
+            .isInstanceOf(NullPointerException.class);
     }
 
     @Test
-    public void buildShoudWork() {
+    void buildShoudWork() {
         Flags flags = new Flags(Flag.RECENT);
         long modSeq = 1;
 
@@ -72,7 +76,7 @@ public class ComposedMessageIdWithMetaDataTest {
     }
 
     @Test
-    public void isMatchingShouldReturnTrueWhenSameMessageId() {
+    void isMatchingShouldReturnTrueWhenSameMessageId() {
         ComposedMessageIdWithMetaData composedMessageIdWithMetaData = 
ComposedMessageIdWithMetaData.builder()
                 .composedMessageId(new ComposedMessageId(TEST_ID, 
TEST_MESSAGE_ID, MESSAGE_UID))
                 .flags(new Flags(Flag.RECENT))
@@ -83,7 +87,7 @@ public class ComposedMessageIdWithMetaDataTest {
     }
 
     @Test
-    public void isMatchingShouldReturnFalseWhenOtherMessageId() {
+    void isMatchingShouldReturnFalseWhenOtherMessageId() {
         ComposedMessageIdWithMetaData composedMessageIdWithMetaData = 
ComposedMessageIdWithMetaData.builder()
                 .composedMessageId(COMPOSED_MESSAGE_ID)
                 .flags(new Flags(Flag.RECENT))
@@ -94,7 +98,7 @@ public class ComposedMessageIdWithMetaDataTest {
     }
 
     @Test
-    public void shouldRespectJavaBeanContract() {
+    void shouldRespectJavaBeanContract() {
         EqualsVerifier.forClass(ComposedMessageIdWithMetaData.class)
             .verify();
     }
diff --git 
a/mailbox/api/src/test/java/org/apache/james/mailbox/model/MailboxACLEntryKeyTest.java
 
b/mailbox/api/src/test/java/org/apache/james/mailbox/model/MailboxACLEntryKeyTest.java
index 8617f55..0e0307b 100644
--- 
a/mailbox/api/src/test/java/org/apache/james/mailbox/model/MailboxACLEntryKeyTest.java
+++ 
b/mailbox/api/src/test/java/org/apache/james/mailbox/model/MailboxACLEntryKeyTest.java
@@ -22,132 +22,131 @@ package org.apache.james.mailbox.model;
 
 import static org.assertj.core.api.Assertions.assertThat;
 
-import org.apache.james.mailbox.exception.UnsupportedRightException;
 import org.apache.james.mailbox.model.MailboxACL.EntryKey;
 import org.apache.james.mailbox.model.MailboxACL.NameType;
 import org.apache.james.mailbox.model.MailboxACL.SpecialName;
-import org.junit.Test;
+import org.junit.jupiter.api.Test;
 
-public class MailboxACLEntryKeyTest {
+class MailboxACLEntryKeyTest {
     private static final String GROUP_1 = "group1";
     private static final String USER_1 = "user1";
 
     @Test
-    public void testUser() throws UnsupportedRightException {
+    void testUser() {
         assertThat(EntryKey.deserialize(USER_1))
             .isEqualTo(new EntryKey(USER_1, NameType.user, false));
     }
 
     @Test
-    public void testNegativeUser() throws UnsupportedRightException {
+    void testNegativeUser() {
         assertThat(EntryKey.deserialize(MailboxACL.DEFAULT_NEGATIVE_MARKER + 
USER_1))
             .isEqualTo(new EntryKey(USER_1, NameType.user, true));
     }
 
     @Test
-    public void testGroup() throws UnsupportedRightException {
+    void testGroup() {
         assertThat(EntryKey.deserialize(MailboxACL.DEFAULT_GROUP_MARKER + 
GROUP_1))
             .isEqualTo(new EntryKey(GROUP_1, NameType.group, false));
     }
 
     @Test
-    public void testNegativeGroup() throws UnsupportedRightException {
+    void testNegativeGroup() {
         
assertThat(EntryKey.deserialize(String.valueOf(MailboxACL.DEFAULT_NEGATIVE_MARKER)
 + MailboxACL.DEFAULT_GROUP_MARKER + GROUP_1))
             .isEqualTo(new EntryKey(GROUP_1, NameType.group, true));
     }
 
     @Test
-    public void testOwner() throws UnsupportedRightException {
+    void testOwner() {
         assertThat(EntryKey.deserialize(SpecialName.owner.toString()))
             .isEqualTo(new EntryKey(SpecialName.owner.toString(), 
NameType.special, false));
     }
 
     @Test
-    public void testNegativeOwner() throws UnsupportedRightException {
+    void testNegativeOwner() {
         assertThat(EntryKey.deserialize(MailboxACL.DEFAULT_NEGATIVE_MARKER + 
SpecialName.owner.toString()))
             .isEqualTo(new EntryKey(SpecialName.owner.toString(), 
NameType.special, true));
     }
 
     @Test
-    public void testAnybody() throws UnsupportedRightException {
+    void testAnybody() {
         assertThat(EntryKey.deserialize(SpecialName.anybody.toString()))
             .isEqualTo(new EntryKey(SpecialName.anybody.toString(), 
NameType.special, false));
     }
 
     @Test
-    public void testNegativeAnybody() throws UnsupportedRightException {
+    void testNegativeAnybody() {
         assertThat(EntryKey.deserialize(MailboxACL.DEFAULT_NEGATIVE_MARKER + 
SpecialName.anybody.toString()))
             .isEqualTo(new EntryKey(SpecialName.anybody.toString(), 
NameType.special, true));
     }
 
     @Test
-    public void testAuthenticated() throws UnsupportedRightException {
+    void testAuthenticated() {
         assertThat(EntryKey.deserialize(SpecialName.authenticated.toString()))
             .isEqualTo(new EntryKey(SpecialName.authenticated.toString(), 
NameType.special, false));
     }
 
     @Test
-    public void testNegativeAuthenticated() throws UnsupportedRightException {
+    void testNegativeAuthenticated() {
         assertThat(EntryKey.deserialize(MailboxACL.DEFAULT_NEGATIVE_MARKER + 
SpecialName.authenticated.toString()))
             .isEqualTo(new EntryKey(SpecialName.authenticated.toString(), 
NameType.special, true));
     }
 
     @Test
-    public void testSerializeUser() throws UnsupportedRightException {
+    void testSerializeUser() {
         assertThat(new EntryKey(USER_1, NameType.user, false).serialize())
             .isEqualTo(USER_1);
     }
 
     @Test
-    public void testSerializeNegativeUser() throws UnsupportedRightException {
+    void testSerializeNegativeUser() {
         assertThat(new EntryKey(USER_1, NameType.user, true).serialize())
             .isEqualTo(MailboxACL.DEFAULT_NEGATIVE_MARKER + USER_1);
     }
 
     @Test
-    public void testSerializeGroup() throws UnsupportedRightException {
+    void testSerializeGroup() {
         assertThat(new EntryKey(GROUP_1, NameType.group, false).serialize())
             .isEqualTo(MailboxACL.DEFAULT_GROUP_MARKER + GROUP_1);
     }
 
     @Test
-    public void testSerializeNegativeGroup() throws UnsupportedRightException {
+    void testSerializeNegativeGroup() {
         assertThat(new EntryKey(GROUP_1, NameType.group, true).serialize())
             .isEqualTo(String.valueOf(MailboxACL.DEFAULT_NEGATIVE_MARKER) + 
MailboxACL.DEFAULT_GROUP_MARKER + GROUP_1);
     }
 
     @Test
-    public void testSerializeOwner() throws UnsupportedRightException {
+    void testSerializeOwner() {
         assertThat(new EntryKey(SpecialName.owner.toString(), 
NameType.special, false).serialize())
             .isEqualTo(SpecialName.owner.toString());
     }
 
     @Test
-    public void testSerializeNegativeOwner() throws UnsupportedRightException {
+    void testSerializeNegativeOwner() {
         assertThat(new EntryKey(SpecialName.owner.toString(), 
NameType.special, true).serialize())
             .isEqualTo(MailboxACL.DEFAULT_NEGATIVE_MARKER + 
SpecialName.owner.toString());
     }
 
     @Test
-    public void testSerializeAnybody() throws UnsupportedRightException {
+    void testSerializeAnybody() {
         assertThat(new EntryKey(SpecialName.anybody.toString(), 
NameType.special, false).serialize())
             .isEqualTo(SpecialName.anybody.toString());
     }
 
     @Test
-    public void testSerializeNegativeAnybody() throws 
UnsupportedRightException {
+    void testSerializeNegativeAnybody() {
         assertThat(new EntryKey(SpecialName.anybody.toString(), 
NameType.special, true).serialize())
             .isEqualTo(MailboxACL.DEFAULT_NEGATIVE_MARKER + 
SpecialName.anybody.toString());
     }
 
     @Test
-    public void testSerializeAuthenticated() throws UnsupportedRightException {
+    void testSerializeAuthenticated() {
         assertThat(new EntryKey(SpecialName.authenticated.toString(), 
NameType.special, false).serialize())
             .isEqualTo(SpecialName.authenticated.toString());
     }
 
     @Test
-    public void testSerializeNegativeAuthenticated() throws 
UnsupportedRightException {
+    void testSerializeNegativeAuthenticated() {
         assertThat(new EntryKey(SpecialName.authenticated.toString(), 
NameType.special, true).serialize())
             .isEqualTo(MailboxACL.DEFAULT_NEGATIVE_MARKER + 
SpecialName.authenticated.toString());
     }
diff --git 
a/mailbox/api/src/test/java/org/apache/james/mailbox/model/MailboxACLTest.java 
b/mailbox/api/src/test/java/org/apache/james/mailbox/model/MailboxACLTest.java
index fd0e05d..8282c9d 100644
--- 
a/mailbox/api/src/test/java/org/apache/james/mailbox/model/MailboxACLTest.java
+++ 
b/mailbox/api/src/test/java/org/apache/james/mailbox/model/MailboxACLTest.java
@@ -32,12 +32,12 @@ import org.apache.james.mailbox.model.MailboxACL.EntryKey;
 import org.apache.james.mailbox.model.MailboxACL.NameType;
 import org.apache.james.mailbox.model.MailboxACL.Rfc4314Rights;
 import org.assertj.core.data.MapEntry;
-import org.junit.Before;
-import org.junit.Test;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
 
 import com.google.common.collect.ImmutableMap;
 
-public class MailboxACLTest {
+class MailboxACLTest {
 
     private static final String USER_1 = "user1";
     private static final String USER_2 = "user2";
@@ -53,8 +53,8 @@ public class MailboxACLTest {
 
     private MailboxACL u1u2g1g2ACL;
 
-    @Before
-    public void setUp() throws Exception {
+    @BeforeEach
+    void setUp() throws Exception {
 
         u1u2g1g2Properties = new Properties();
 
@@ -68,7 +68,7 @@ public class MailboxACLTest {
     }
 
     @Test
-    public void testUnionACLNew() throws UnsupportedRightException {
+    void testUnionACLNew() throws UnsupportedRightException {
 
         Map<EntryKey, Rfc4314Rights> expectedEntries = new 
HashMap<>(u1u2g1g2ACL.getEntries());
         expectedEntries.put(MailboxACL.OWNER_KEY, MailboxACL.FULL_RIGHTS);
@@ -82,7 +82,7 @@ public class MailboxACLTest {
     }
 
     @Test
-    public void testUnionEntryNew() throws UnsupportedRightException {
+    void testUnionEntryNew() throws UnsupportedRightException {
 
         Map<EntryKey, Rfc4314Rights> expectedEntries = new 
HashMap<>(u1u2g1g2ACL.getEntries());
         expectedEntries.put(MailboxACL.OWNER_KEY, MailboxACL.FULL_RIGHTS);
@@ -95,7 +95,7 @@ public class MailboxACLTest {
     }
 
     @Test
-    public void testUnionACLExisting() throws UnsupportedRightException {
+    void testUnionACLExisting() throws UnsupportedRightException {
 
         Map<EntryKey, Rfc4314Rights> expectedEntries = new 
HashMap<>(u1u2g1g2ACL.getEntries());
         expectedEntries.put(EntryKey.deserialize(USER_1), 
Rfc4314Rights.fromSerializedRfc4314Rights(aeik + lprs));
@@ -109,7 +109,7 @@ public class MailboxACLTest {
     }
 
     @Test
-    public void testUnionEntryExisting() throws UnsupportedRightException {
+    void testUnionEntryExisting() throws UnsupportedRightException {
 
         Map<EntryKey, Rfc4314Rights> expectedEntries = new 
HashMap<>(u1u2g1g2ACL.getEntries());
         expectedEntries.put(EntryKey.deserialize(USER_1), 
Rfc4314Rights.fromSerializedRfc4314Rights(aeik + lprs));
@@ -122,17 +122,17 @@ public class MailboxACLTest {
     }
 
     @Test
-    public void testUnionACLZero() throws UnsupportedRightException {
+    void testUnionACLZero() throws UnsupportedRightException {
 
     }
 
     @Test
-    public void testUnionEntryZero() throws UnsupportedRightException {
+    void testUnionEntryZero() throws UnsupportedRightException {
 
     }
 
     @Test
-    public void testExceptACLNew() throws UnsupportedRightException {
+    void testExceptACLNew() throws UnsupportedRightException {
 
         /* actually no change expected */
         Map<EntryKey, Rfc4314Rights> expectedEntries = new 
HashMap<>(u1u2g1g2ACL.getEntries());
@@ -146,7 +146,7 @@ public class MailboxACLTest {
     }
 
     @Test
-    public void testExceptEntryNew() throws UnsupportedRightException {
+    void testExceptEntryNew() throws UnsupportedRightException {
 
         /* actually no change expected */
         Map<EntryKey, Rfc4314Rights> expectedEntries = new 
HashMap<>(u1u2g1g2ACL.getEntries());
@@ -159,7 +159,7 @@ public class MailboxACLTest {
     }
 
     @Test
-    public void testExceptACLExisting() throws UnsupportedRightException {
+    void testExceptACLExisting() throws UnsupportedRightException {
 
         Map<EntryKey, Rfc4314Rights> expectedEntries = new 
HashMap<>(u1u2g1g2ACL.getEntries());
         expectedEntries.put(EntryKey.deserialize(USER_1), 
Rfc4314Rights.fromSerializedRfc4314Rights(ik));
@@ -173,7 +173,7 @@ public class MailboxACLTest {
     }
 
     @Test
-    public void testExceptEntryExisting() throws UnsupportedRightException {
+    void testExceptEntryExisting() throws UnsupportedRightException {
 
         Map<EntryKey, Rfc4314Rights> expectedEntries = new 
HashMap<>(u1u2g1g2ACL.getEntries());
         expectedEntries.put(EntryKey.deserialize(USER_1), 
Rfc4314Rights.fromSerializedRfc4314Rights(ik));
@@ -186,7 +186,7 @@ public class MailboxACLTest {
     }
 
     @Test
-    public void testExceptACLFull() throws UnsupportedRightException {
+    void testExceptACLFull() throws UnsupportedRightException {
 
         Map<EntryKey, Rfc4314Rights> expectedEntries = new 
HashMap<>(u1u2g1g2ACL.getEntries());
         expectedEntries.remove(EntryKey.deserialize(USER_1));
@@ -200,7 +200,7 @@ public class MailboxACLTest {
     }
 
     @Test
-    public void testExceptEntryFull() throws UnsupportedRightException {
+    void testExceptEntryFull() throws UnsupportedRightException {
 
         Map<EntryKey, Rfc4314Rights> expectedEntries = new 
HashMap<>(u1u2g1g2ACL.getEntries());
         expectedEntries.remove(EntryKey.deserialize(USER_1));
@@ -213,26 +213,26 @@ public class MailboxACLTest {
     }
 
     @Test
-    public void propertiesConstructorShouldAcceptNullValues() throws Exception 
{
+    void propertiesConstructorShouldAcceptNullValues() throws Exception {
         assertThat(new MailboxACL((Properties) null))
             .isEqualTo(MailboxACL.EMPTY);
     }
 
     @Test
-    public void applyShouldNotThrowWhenRemovingANonExistingEntry() throws 
Exception {
+    void applyShouldNotThrowWhenRemovingANonExistingEntry() throws Exception {
         assertThat(MailboxACL.EMPTY
             
.apply(MailboxACL.command().forUser("bob").noRights().asReplacement()))
             .isEqualTo(MailboxACL.EMPTY);
     }
 
     @Test
-    public void usersACLShouldReturnEmptyMapWhenEmpty() {
+    void usersACLShouldReturnEmptyMapWhenEmpty() {
         assertThat(MailboxACL.EMPTY.ofPositiveNameType(NameType.user))
             .isEmpty();
     }
 
     @Test
-    public void usersACLShouldReturnEmptyMapWhenNoUserEntry() {
+    void usersACLShouldReturnEmptyMapWhenNoUserEntry() {
         MailboxACL mailboxACL = new MailboxACL(
                 ImmutableMap.of(EntryKey.createGroupEntryKey("group"), 
MailboxACL.FULL_RIGHTS,
                     EntryKey.createGroupEntryKey("group2"), 
MailboxACL.NO_RIGHTS));
@@ -241,7 +241,7 @@ public class MailboxACLTest {
     }
 
     @Test
-    public void usersACLShouldReturnOnlyUsersMapWhenSomeUserEntries() throws 
Exception {
+    void usersACLShouldReturnOnlyUsersMapWhenSomeUserEntries() throws 
Exception {
         MailboxACL.Rfc4314Rights rights = 
MailboxACL.Rfc4314Rights.fromSerializedRfc4314Rights("aei");
         MailboxACL mailboxACL = new MailboxACL(
             ImmutableMap.of(EntryKey.createUserEntryKey("user1"), 
MailboxACL.FULL_RIGHTS,
@@ -255,7 +255,7 @@ public class MailboxACLTest {
     }
 
     @Test
-    public void ofPositiveNameTypeShouldFilterOutNegativeEntries() throws 
Exception {
+    void ofPositiveNameTypeShouldFilterOutNegativeEntries() throws Exception {
         MailboxACL mailboxACL = new MailboxACL(
             ImmutableMap.of(EntryKey.createUserEntryKey("user1", NEGATIVE), 
MailboxACL.FULL_RIGHTS));
         assertThat(mailboxACL.ofPositiveNameType(NameType.user))
diff --git 
a/mailbox/api/src/test/java/org/apache/james/mailbox/model/MailboxAnnotationKeyTest.java
 
b/mailbox/api/src/test/java/org/apache/james/mailbox/model/MailboxAnnotationKeyTest.java
index 4b5986e..d9dfd82 100644
--- 
a/mailbox/api/src/test/java/org/apache/james/mailbox/model/MailboxAnnotationKeyTest.java
+++ 
b/mailbox/api/src/test/java/org/apache/james/mailbox/model/MailboxAnnotationKeyTest.java
@@ -20,109 +20,123 @@
 package org.apache.james.mailbox.model;
 
 import static org.assertj.core.api.Assertions.assertThat;
+import static org.assertj.core.api.Assertions.assertThatThrownBy;
 
-import org.junit.Test;
+import org.junit.jupiter.api.Test;
 
-public class MailboxAnnotationKeyTest {
-    @Test(expected = IllegalArgumentException.class)
-    public void newInstanceShouldThrowsExceptionWhenKeyDoesNotStartWithSlash() 
throws Exception {
-        new MailboxAnnotationKey("shared");
+class MailboxAnnotationKeyTest {
+    @Test
+    void newInstanceShouldThrowsExceptionWhenKeyDoesNotStartWithSlash() {
+        assertThatThrownBy(() -> new MailboxAnnotationKey("shared"))
+            .isInstanceOf(IllegalArgumentException.class);
     }
 
-    @Test(expected = IllegalArgumentException.class)
-    public void newInstanceShouldThrowsExceptionWhenKeyContainsAsterisk() 
throws Exception {
-        new MailboxAnnotationKey("/private/key*comment");
+    @Test
+    void newInstanceShouldThrowsExceptionWhenKeyContainsAsterisk() {
+        assertThatThrownBy(() -> new 
MailboxAnnotationKey("/private/key*comment"))
+            .isInstanceOf(IllegalArgumentException.class);
     }
 
-    @Test(expected = IllegalArgumentException.class)
-    public void newInstanceShouldThrowsExceptionWhenKeyContainsPercent() 
throws Exception {
-        new MailboxAnnotationKey("/private/key%comment");
+    @Test
+    void newInstanceShouldThrowsExceptionWhenKeyContainsPercent() {
+        assertThatThrownBy(() -> new 
MailboxAnnotationKey("/private/key%comment"))
+            .isInstanceOf(IllegalArgumentException.class);
     }
 
-    @Test(expected = IllegalArgumentException.class)
-    public void 
validKeyShouldThrowsExceptionWhenKeyContainsTwoConsecutiveSlash() throws 
Exception {
-        new MailboxAnnotationKey("/private//keycomment");
+    @Test
+    void validKeyShouldThrowsExceptionWhenKeyContainsTwoConsecutiveSlash() {
+        assertThatThrownBy(() -> new 
MailboxAnnotationKey("/private//keycomment"))
+            .isInstanceOf(IllegalArgumentException.class);
     }
 
-    @Test(expected = IllegalArgumentException.class)
-    public void validKeyShouldThrowsExceptionWhenKeyEndsWithSlash() throws 
Exception {
-        new MailboxAnnotationKey("/private/keycomment/");
+    @Test
+    void validKeyShouldThrowsExceptionWhenKeyEndsWithSlash() {
+        assertThatThrownBy(() -> new 
MailboxAnnotationKey("/private/keycomment/"))
+            .isInstanceOf(IllegalArgumentException.class);
     }
 
-    @Test(expected = IllegalArgumentException.class)
-    public void validKeyShouldThrowsExceptionWhenKeyContainsNonASCII() throws 
Exception {
-        new MailboxAnnotationKey("/private/key comment");
+    @Test
+    void validKeyShouldThrowsExceptionWhenKeyContainsNonASCII() {
+        assertThatThrownBy(() -> new 
MailboxAnnotationKey("/private/key comment"))
+            .isInstanceOf(IllegalArgumentException.class);
     }
 
-    @Test(expected = IllegalArgumentException.class)
-    public void validKeyShouldThrowsExceptionWhenKeyContainsTabCharacter() 
throws Exception {
-        new MailboxAnnotationKey("/private/key\tcomment");
+    @Test
+    void validKeyShouldThrowsExceptionWhenKeyContainsTabCharacter() {
+        assertThatThrownBy(() -> new 
MailboxAnnotationKey("/private/key\tcomment"))
+            .isInstanceOf(IllegalArgumentException.class);
     }
 
-    @Test(expected = IllegalArgumentException.class)
-    public void newInstanceShouldThrowsExceptionWithEmptyKey() throws 
Exception {
-        new MailboxAnnotationKey("");
+    @Test
+    void newInstanceShouldThrowsExceptionWithEmptyKey() {
+        assertThatThrownBy(() -> new MailboxAnnotationKey(""))
+            .isInstanceOf(IllegalArgumentException.class);
     }
 
-    @Test(expected = IllegalArgumentException.class)
-    public void newInstanceShouldThrowsExceptionWithBlankKey() throws 
Exception {
-        new MailboxAnnotationKey("    ");
+    @Test
+    void newInstanceShouldThrowsExceptionWithBlankKey() {
+        assertThatThrownBy(() -> new MailboxAnnotationKey("    "))
+            .isInstanceOf(IllegalArgumentException.class);
     }
 
     @Test
-    public void newInstanceShouldReturnRightKeyValue() throws Exception {
+    void newInstanceShouldReturnRightKeyValue() {
         MailboxAnnotationKey annotationKey = new 
MailboxAnnotationKey("/private/comment");
         assertThat(annotationKey.asString()).isEqualTo("/private/comment");
     }
 
     @Test
-    public void keyValueShouldBeCaseInsensitive() throws Exception {
+    void keyValueShouldBeCaseInsensitive() {
         MailboxAnnotationKey annotationKey = new 
MailboxAnnotationKey("/private/comment");
         MailboxAnnotationKey anotherAnnotationKey = new 
MailboxAnnotationKey("/PRIVATE/COMMENT");
 
         assertThat(annotationKey).isEqualTo(anotherAnnotationKey);
     }
 
-    @Test(expected = IllegalArgumentException.class)
-    public void 
newInstanceShouldThrowsExceptionWhenKeyContainsPunctuationCharacters() throws 
Exception {
-        new MailboxAnnotationKey("/private/+comment");
+    @Test
+    void 
newInstanceShouldThrowsExceptionWhenKeyContainsPunctuationCharacters() {
+        assertThatThrownBy(() -> new MailboxAnnotationKey("/private/+comment"))
+            .isInstanceOf(IllegalArgumentException.class);
     }
 
     @Test
-    public void countSlashShouldReturnRightNumberOfSlash() throws Exception {
+    void countSlashShouldReturnRightNumberOfSlash() {
         MailboxAnnotationKey annotationKey = new 
MailboxAnnotationKey("/private/comment/user/name");
         assertThat(annotationKey.countComponents()).isEqualTo(4);
     }
 
-    @Test(expected = IllegalArgumentException.class)
-    public void keyMustContainAtLeastTwoComponents() throws Exception {
-        new MailboxAnnotationKey("/private");
+    @Test
+    void keyMustContainAtLeastTwoComponents() {
+        assertThatThrownBy(() -> new MailboxAnnotationKey("/private"))
+            .isInstanceOf(IllegalArgumentException.class);
     }
 
-    @Test(expected = IllegalArgumentException.class)
-    public void keyVendorShouldThrowsExceptionWithTwoComponents() throws 
Exception {
-        new MailboxAnnotationKey("/private/vendor");
+    @Test
+    void keyVendorShouldThrowsExceptionWithTwoComponents() {
+        assertThatThrownBy(() -> new MailboxAnnotationKey("/private/vendor"))
+            .isInstanceOf(IllegalArgumentException.class);
     }
 
-    @Test(expected = IllegalArgumentException.class)
-    public void keyVendorShouldThrowsExceptionWithThreeComponents() throws 
Exception {
-        new MailboxAnnotationKey("/shared/vendor/token");
+    @Test
+    void keyVendorShouldThrowsExceptionWithThreeComponents() {
+        assertThatThrownBy(() -> new 
MailboxAnnotationKey("/shared/vendor/token"))
+            .isInstanceOf(IllegalArgumentException.class);
     }
 
     @Test
-    public void keyVendorShouldOKWithFourComponents() throws Exception {
+    void keyVendorShouldOKWithFourComponents() {
         new MailboxAnnotationKey("/shared/vendor/token/comment");
     }
 
     @Test
-    public void isParentOrIsEqualShouldReturnTrueWhenSameKey() {
+    void isParentOrIsEqualShouldReturnTrueWhenSameKey() {
         MailboxAnnotationKey key1 = new 
MailboxAnnotationKey("/private/comment");
 
         assertThat(key1.isParentOrIsEqual(key1)).isTrue();
     }
 
     @Test
-    public void isParentOrIsEqualShouldReturnTrueWhenParent() {
+    void isParentOrIsEqualShouldReturnTrueWhenParent() {
         MailboxAnnotationKey key1 = new 
MailboxAnnotationKey("/private/comment");
         MailboxAnnotationKey key2 = new 
MailboxAnnotationKey("/private/comment/toto");
 
@@ -130,7 +144,7 @@ public class MailboxAnnotationKeyTest {
     }
 
     @Test
-    public void isParentOrIsEqualShouldReturnFalseWhenChild() {
+    void isParentOrIsEqualShouldReturnFalseWhenChild() {
         MailboxAnnotationKey key1 = new 
MailboxAnnotationKey("/private/comment");
         MailboxAnnotationKey key2 = new 
MailboxAnnotationKey("/private/comment/toto");
 
@@ -138,7 +152,7 @@ public class MailboxAnnotationKeyTest {
     }
 
     @Test
-    public void isParentOrIsEqualShouldReturnFalseWhenGrandParent() {
+    void isParentOrIsEqualShouldReturnFalseWhenGrandParent() {
         MailboxAnnotationKey key1 = new 
MailboxAnnotationKey("/private/comment");
         MailboxAnnotationKey key2 = new 
MailboxAnnotationKey("/private/comment/toto/tata");
 
@@ -146,7 +160,7 @@ public class MailboxAnnotationKeyTest {
     }
 
     @Test
-    public void isParentOrIsEqualShouldReturnFalseWhenCousin() {
+    void isParentOrIsEqualShouldReturnFalseWhenCousin() {
         MailboxAnnotationKey key1 = new 
MailboxAnnotationKey("/private/comment/tutu");
         MailboxAnnotationKey key2 = new 
MailboxAnnotationKey("/private/comment/toto/tata");
 
@@ -155,14 +169,14 @@ public class MailboxAnnotationKeyTest {
 
 
     @Test
-    public void isAncestorOrIsEqualShouldReturnTrueWhenSameKey() {
+    void isAncestorOrIsEqualShouldReturnTrueWhenSameKey() {
         MailboxAnnotationKey key1 = new 
MailboxAnnotationKey("/private/comment");
 
         assertThat(key1.isAncestorOrIsEqual(key1)).isTrue();
     }
 
     @Test
-    public void isAncestorOrIsEqualShouldReturnTrueWhenParent() {
+    void isAncestorOrIsEqualShouldReturnTrueWhenParent() {
         MailboxAnnotationKey key1 = new 
MailboxAnnotationKey("/private/comment");
         MailboxAnnotationKey key2 = new 
MailboxAnnotationKey("/private/comment/toto");
 
@@ -170,7 +184,7 @@ public class MailboxAnnotationKeyTest {
     }
 
     @Test
-    public void isAncestorOrIsEqualShouldReturnFalseWhenChild() {
+    void isAncestorOrIsEqualShouldReturnFalseWhenChild() {
         MailboxAnnotationKey key1 = new 
MailboxAnnotationKey("/private/comment");
         MailboxAnnotationKey key2 = new 
MailboxAnnotationKey("/private/comment/toto");
 
@@ -178,7 +192,7 @@ public class MailboxAnnotationKeyTest {
     }
 
     @Test
-    public void isAncestorOrIsEqualShouldReturnTrueWhenGrandParent() {
+    void isAncestorOrIsEqualShouldReturnTrueWhenGrandParent() {
         MailboxAnnotationKey key1 = new 
MailboxAnnotationKey("/private/comment");
         MailboxAnnotationKey key2 = new 
MailboxAnnotationKey("/private/comment/toto/tata");
 
@@ -186,7 +200,7 @@ public class MailboxAnnotationKeyTest {
     }
 
     @Test
-    public void isAncestorOrIsEqualShouldReturnFalseWhenCousin() {
+    void isAncestorOrIsEqualShouldReturnFalseWhenCousin() {
         MailboxAnnotationKey key1 = new 
MailboxAnnotationKey("/private/comment/tutu");
         MailboxAnnotationKey key2 = new 
MailboxAnnotationKey("/private/comment/toto/tata");
 
@@ -194,7 +208,7 @@ public class MailboxAnnotationKeyTest {
     }
 
     @Test
-    public void isAncestorOrIsEqualShouldWorkOnCousinKeyUsingKeyAsAPrefix() {
+    void isAncestorOrIsEqualShouldWorkOnCousinKeyUsingKeyAsAPrefix() {
         MailboxAnnotationKey key1 = new 
MailboxAnnotationKey("/private/comment/tutu");
         MailboxAnnotationKey key2 = new 
MailboxAnnotationKey("/private/comment/tututata");
 
@@ -202,7 +216,7 @@ public class MailboxAnnotationKeyTest {
     }
 
     @Test
-    public void isParentOrIsEqualShouldWorkOnCousinKeyUsingKeyAsAPrefix() {
+    void isParentOrIsEqualShouldWorkOnCousinKeyUsingKeyAsAPrefix() {
         MailboxAnnotationKey key1 = new 
MailboxAnnotationKey("/private/comment/tutu");
         MailboxAnnotationKey key2 = new 
MailboxAnnotationKey("/private/comment/tututata");
 
diff --git 
a/mailbox/api/src/test/java/org/apache/james/mailbox/model/MailboxAnnotationTest.java
 
b/mailbox/api/src/test/java/org/apache/james/mailbox/model/MailboxAnnotationTest.java
index 583f960..b1d2a81 100644
--- 
a/mailbox/api/src/test/java/org/apache/james/mailbox/model/MailboxAnnotationTest.java
+++ 
b/mailbox/api/src/test/java/org/apache/james/mailbox/model/MailboxAnnotationTest.java
@@ -20,63 +20,61 @@
 package org.apache.james.mailbox.model;
 
 import static org.assertj.core.api.Assertions.assertThat;
+import static org.assertj.core.api.Assertions.assertThatThrownBy;
 
-import org.junit.Test;
+import org.junit.jupiter.api.Test;
 
-public class MailboxAnnotationTest {
+class MailboxAnnotationTest {
     private static final MailboxAnnotationKey ANNOTATION_KEY = new 
MailboxAnnotationKey("/private/comment");
     private static final String ANNOTATION_VALUE = "anyValue";
 
     @Test
-    public void sizeOfAnnotationShouldBeReturnLengthOfValue() throws Exception 
{
+    void sizeOfAnnotationShouldBeReturnLengthOfValue() {
         MailboxAnnotation mailboxAnnotation = 
MailboxAnnotation.newInstance(ANNOTATION_KEY, ANNOTATION_VALUE);
 
         assertThat(mailboxAnnotation.size()).isEqualTo(8);
     }
 
     @Test
-    public void sizeOfNilAnnotationShouldBeZero() throws Exception {
+    void sizeOfNilAnnotationShouldBeZero() {
         MailboxAnnotation mailboxAnnotation = 
MailboxAnnotation.nil(ANNOTATION_KEY);
 
         assertThat(mailboxAnnotation.size()).isEqualTo(0);
     }
     
-    @Test(expected = NullPointerException.class)
-    public void newInstanceShouldThrowsExceptionWithNullKey() throws Exception 
{
-        MailboxAnnotation.newInstance(null, null);
+    @Test
+    void newInstanceShouldThrowsExceptionWithNullKey() {
+        assertThatThrownBy(() -> MailboxAnnotation.newInstance(null, null))
+            .isInstanceOf(NullPointerException.class);
     }
 
-    @Test(expected = NullPointerException.class)
-    public void newInstanceShouldThrowsExceptionWithNullValue() throws 
Exception {
-        MailboxAnnotation.newInstance(ANNOTATION_KEY, null);
+    @Test
+    void newInstanceShouldThrowsExceptionWithNullValue() {
+        assertThatThrownBy(() -> MailboxAnnotation.newInstance(ANNOTATION_KEY, 
null))
+            .isInstanceOf(NullPointerException.class);
     }
 
     @Test
-    public void nilInstanceShouldReturnAbsentValue() throws Exception {
+    void nilInstanceShouldReturnAbsentValue() {
         MailboxAnnotation annotation = MailboxAnnotation.nil(ANNOTATION_KEY);
 
         assertThat(annotation.getValue()).isEmpty();
     }
 
     @Test
-    public void isNilShouldReturnTrueForNilObject() throws Exception {
+    void isNilShouldReturnTrueForNilObject() {
         MailboxAnnotation nilAnnotation = 
MailboxAnnotation.nil(ANNOTATION_KEY);
         assertThat(nilAnnotation.isNil()).isTrue();
     }
 
     @Test
-    public void isNilShouldReturnFalseForNotNilObject() throws Exception {
+    void isNilShouldReturnFalseForNotNilObject() {
         MailboxAnnotation nilAnnotation = 
MailboxAnnotation.newInstance(ANNOTATION_KEY, ANNOTATION_VALUE);
         assertThat(nilAnnotation.isNil()).isFalse();
     }
 
-    @Test(expected = NullPointerException.class)
-    public void 
newInstanceMailboxAnnotationShouldThrowExceptionWithNullValue() throws 
Exception {
-        MailboxAnnotation.newInstance(ANNOTATION_KEY, null);
-    }
-
     @Test
-    public void newInstanceMailboxAnnotationShouldCreateNewInstance() throws 
Exception {
+    void newInstanceMailboxAnnotationShouldCreateNewInstance() {
         MailboxAnnotation annotation = 
MailboxAnnotation.newInstance(ANNOTATION_KEY, ANNOTATION_VALUE);
 
         assertThat(annotation.getKey()).isEqualTo(ANNOTATION_KEY);
diff --git 
a/mailbox/api/src/test/java/org/apache/james/mailbox/model/MailboxAssertTests.java
 
b/mailbox/api/src/test/java/org/apache/james/mailbox/model/MailboxAssertTests.java
index f006308..62f8bae 100644
--- 
a/mailbox/api/src/test/java/org/apache/james/mailbox/model/MailboxAssertTests.java
+++ 
b/mailbox/api/src/test/java/org/apache/james/mailbox/model/MailboxAssertTests.java
@@ -19,64 +19,77 @@
 
 package org.apache.james.mailbox.model;
 
-import org.junit.Test;
+import static org.assertj.core.api.Assertions.assertThatThrownBy;
 
-public class MailboxAssertTests {
+import org.junit.jupiter.api.Test;
+
+class MailboxAssertTests {
 
     private static final long UID_VALIDITY = 42;
     private static final TestId MAILBOX_ID = TestId.of(24);
 
     @Test
-    public void isEqualToShouldNotFailWithEqualMailbox() {
+    void isEqualToShouldNotFailWithEqualMailbox() {
         Mailbox mailbox1 = new Mailbox(MailboxPath.forUser("user", "name"), 
UID_VALIDITY);
         Mailbox mailbox2 = new Mailbox(MailboxPath.forUser("user", "name"), 
UID_VALIDITY);
         mailbox1.setMailboxId(MAILBOX_ID);
         mailbox2.setMailboxId(MAILBOX_ID);
+
         MailboxAssert.assertThat(mailbox1).isEqualTo(mailbox2);
     }
 
-    @Test(expected = AssertionError.class)
-    public void isEqualToShouldFailWithNotEqualNamespace() {
+    @Test
+    void isEqualToShouldFailWithNotEqualNamespace() {
         Mailbox mailbox1 = new Mailbox(MailboxPath.forUser("user", "name"), 
UID_VALIDITY);
         Mailbox mailbox2 = new Mailbox(new MailboxPath("other_namespace", 
"user", "name"), UID_VALIDITY);
         mailbox1.setMailboxId(MAILBOX_ID);
         mailbox2.setMailboxId(MAILBOX_ID);
-        MailboxAssert.assertThat(mailbox1).isEqualTo(mailbox2);
+
+        assertThatThrownBy(() -> 
MailboxAssert.assertThat(mailbox1).isEqualTo(mailbox2))
+            .isInstanceOf(AssertionError.class);
     }
 
-    @Test(expected = AssertionError.class)
-    public void isEqualToShouldFailWithNotEqualUser() {
+    @Test
+    void isEqualToShouldFailWithNotEqualUser() {
         Mailbox mailbox1 = new Mailbox(MailboxPath.forUser("user", "name"), 
UID_VALIDITY);
         Mailbox mailbox2 = new Mailbox(new MailboxPath("namespace", 
"other_user", "name"), UID_VALIDITY);
         mailbox1.setMailboxId(MAILBOX_ID);
         mailbox2.setMailboxId(MAILBOX_ID);
-        MailboxAssert.assertThat(mailbox1).isEqualTo(mailbox2);
+
+        assertThatThrownBy(() -> 
MailboxAssert.assertThat(mailbox1).isEqualTo(mailbox2))
+            .isInstanceOf(AssertionError.class);
     }
 
-    @Test(expected = AssertionError.class)
-    public void isEqualToShouldFailWithNotEqualName() {
+    @Test
+    void isEqualToShouldFailWithNotEqualName() {
         Mailbox mailbox1 = new Mailbox(MailboxPath.forUser("user", "name"), 
UID_VALIDITY);
         Mailbox mailbox2 = new Mailbox(new MailboxPath("namespace", "user", 
"other_name"), UID_VALIDITY);
         mailbox1.setMailboxId(MAILBOX_ID);
         mailbox2.setMailboxId(MAILBOX_ID);
-        MailboxAssert.assertThat(mailbox1).isEqualTo(mailbox2);
+
+        assertThatThrownBy(() -> 
MailboxAssert.assertThat(mailbox1).isEqualTo(mailbox2))
+            .isInstanceOf(AssertionError.class);
     }
 
-    @Test(expected = AssertionError.class)
-    public void isEqualToShouldFailWithNotEqualId() {
+    @Test
+    void isEqualToShouldFailWithNotEqualId() {
         Mailbox mailbox1 = new Mailbox(MailboxPath.forUser("user", "name"), 
UID_VALIDITY);
         Mailbox mailbox2 = new Mailbox(MailboxPath.forUser("user", "name"), 
UID_VALIDITY);
         mailbox1.setMailboxId(MAILBOX_ID);
         mailbox2.setMailboxId(TestId.of(MAILBOX_ID.id + 1));
-        MailboxAssert.assertThat(mailbox1).isEqualTo(mailbox2);
+
+        assertThatThrownBy(() -> 
MailboxAssert.assertThat(mailbox1).isEqualTo(mailbox2))
+            .isInstanceOf(AssertionError.class);
     }
 
-    @Test(expected = AssertionError.class)
-    public void isEqualToShouldFailWithNotEqualUidValidity() {
+    @Test
+    void isEqualToShouldFailWithNotEqualUidValidity() {
         Mailbox mailbox1 = new Mailbox(MailboxPath.forUser("user", "name"), 
UID_VALIDITY);
         Mailbox mailbox2 = new Mailbox(MailboxPath.forUser("user", "name"), 
UID_VALIDITY + 1);
         mailbox1.setMailboxId(MAILBOX_ID);
         mailbox2.setMailboxId(MAILBOX_ID);
-        MailboxAssert.assertThat(mailbox1).isEqualTo(mailbox2);
+
+        assertThatThrownBy(() -> 
MailboxAssert.assertThat(mailbox1).isEqualTo(mailbox2))
+            .isInstanceOf(AssertionError.class);
     }
 }
diff --git 
a/mailbox/api/src/test/java/org/apache/james/mailbox/model/MailboxCountersTest.java
 
b/mailbox/api/src/test/java/org/apache/james/mailbox/model/MailboxCountersTest.java
index e43f2ce..b7efa25 100644
--- 
a/mailbox/api/src/test/java/org/apache/james/mailbox/model/MailboxCountersTest.java
+++ 
b/mailbox/api/src/test/java/org/apache/james/mailbox/model/MailboxCountersTest.java
@@ -20,14 +20,14 @@
 
 package org.apache.james.mailbox.model;
 
-import org.junit.Test;
+import org.junit.jupiter.api.Test;
 
 import nl.jqno.equalsverifier.EqualsVerifier;
 
-public class MailboxCountersTest {
+class MailboxCountersTest {
 
     @Test
-    public void mailboxCountersShouldRespectBeanContract() {
+    void mailboxCountersShouldRespectBeanContract() {
         EqualsVerifier.forClass(MailboxCounters.class).verify();
     }
 }
diff --git 
a/mailbox/api/src/test/java/org/apache/james/mailbox/model/MailboxPathTest.java 
b/mailbox/api/src/test/java/org/apache/james/mailbox/model/MailboxPathTest.java
index d6606cc..b1817cc 100644
--- 
a/mailbox/api/src/test/java/org/apache/james/mailbox/model/MailboxPathTest.java
+++ 
b/mailbox/api/src/test/java/org/apache/james/mailbox/model/MailboxPathTest.java
@@ -23,20 +23,20 @@ package org.apache.james.mailbox.model;
 import static org.assertj.core.api.Assertions.assertThat;
 
 import org.apache.james.mailbox.DefaultMailboxes;
-import org.junit.Test;
+import org.junit.jupiter.api.Test;
 
 import nl.jqno.equalsverifier.EqualsVerifier;
 
-public class MailboxPathTest {
+class MailboxPathTest {
 
     @Test
-    public void shouldMatchBeanContract() {
+    void shouldMatchBeanContract() {
         EqualsVerifier.forClass(MailboxPath.class)
             .verify();
     }
 
     @Test
-    public void getHierarchyLevelsShouldBeOrdered() {
+    void getHierarchyLevelsShouldBeOrdered() {
         assertThat(MailboxPath.forUser("user", "inbox.folder.subfolder")
             .getHierarchyLevels('.'))
             .containsExactly(
@@ -46,7 +46,7 @@ public class MailboxPathTest {
     }
 
     @Test
-    public void getHierarchyLevelsShouldReturnPathWhenOneLevel() {
+    void getHierarchyLevelsShouldReturnPathWhenOneLevel() {
         assertThat(MailboxPath.forUser("user", "inbox")
             .getHierarchyLevels('.'))
             .containsExactly(
@@ -54,7 +54,7 @@ public class MailboxPathTest {
     }
 
     @Test
-    public void getHierarchyLevelsShouldReturnPathWhenEmptyName() {
+    void getHierarchyLevelsShouldReturnPathWhenEmptyName() {
         assertThat(MailboxPath.forUser("user", "")
             .getHierarchyLevels('.'))
             .containsExactly(
@@ -62,7 +62,7 @@ public class MailboxPathTest {
     }
 
     @Test
-    public void getHierarchyLevelsShouldReturnPathWhenNullName() {
+    void getHierarchyLevelsShouldReturnPathWhenNullName() {
         assertThat(MailboxPath.forUser("user", null)
             .getHierarchyLevels('.'))
             .containsExactly(
@@ -70,7 +70,7 @@ public class MailboxPathTest {
     }
 
     @Test
-    public void sanitizeShouldNotThrowOnNullMailboxName() {
+    void sanitizeShouldNotThrowOnNullMailboxName() {
         assertThat(MailboxPath.forUser("user", null)
             .sanitize('.'))
             .isEqualTo(
@@ -78,7 +78,7 @@ public class MailboxPathTest {
     }
 
     @Test
-    public void sanitizeShouldReturnEmptyWhenEmpty() {
+    void sanitizeShouldReturnEmptyWhenEmpty() {
         assertThat(MailboxPath.forUser("user", "")
             .sanitize('.'))
             .isEqualTo(
@@ -86,7 +86,7 @@ public class MailboxPathTest {
     }
 
     @Test
-    public void sanitizeShouldRemoveMaximumOneTrailingDelimiterWhenAlone() {
+    void sanitizeShouldRemoveMaximumOneTrailingDelimiterWhenAlone() {
         assertThat(MailboxPath.forUser("user", ".")
             .sanitize('.'))
             .isEqualTo(
@@ -94,7 +94,7 @@ public class MailboxPathTest {
     }
 
     @Test
-    public void sanitizeShouldPreserveHeadingDelimiter() {
+    void sanitizeShouldPreserveHeadingDelimiter() {
         assertThat(MailboxPath.forUser("user", ".a")
             .sanitize('.'))
             .isEqualTo(
@@ -102,7 +102,7 @@ public class MailboxPathTest {
     }
 
     @Test
-    public void sanitizeShouldRemoveTrailingDelimiter() {
+    void sanitizeShouldRemoveTrailingDelimiter() {
         assertThat(MailboxPath.forUser("user", "a.")
             .sanitize('.'))
             .isEqualTo(
@@ -110,7 +110,7 @@ public class MailboxPathTest {
     }
 
     @Test
-    public void sanitizeShouldRemoveMaximumOneTrailingDelimiter() {
+    void sanitizeShouldRemoveMaximumOneTrailingDelimiter() {
         assertThat(MailboxPath.forUser("user", "a..")
             .sanitize('.'))
             .isEqualTo(
@@ -118,7 +118,7 @@ public class MailboxPathTest {
     }
 
     @Test
-    public void sanitizeShouldPreserveRedundantDelimiters() {
+    void sanitizeShouldPreserveRedundantDelimiters() {
         assertThat(MailboxPath.forUser("user", "a..a")
             .sanitize('.'))
             .isEqualTo(
@@ -126,75 +126,75 @@ public class MailboxPathTest {
     }
 
     @Test
-    public void hasEmptyNameInHierarchyShouldBeFalseIfSingleLevelPath() {
+    void hasEmptyNameInHierarchyShouldBeFalseIfSingleLevelPath() {
         assertThat(MailboxPath.forUser("user", "a")
             .hasEmptyNameInHierarchy('.'))
             .isFalse();
     }
 
     @Test
-    public void 
hasEmptyNameInHierarchyShouldBeFalseIfNestedLevelWithNonEmptyNames() {
+    void hasEmptyNameInHierarchyShouldBeFalseIfNestedLevelWithNonEmptyNames() {
         assertThat(MailboxPath.forUser("user", "a.b.c")
             .hasEmptyNameInHierarchy('.'))
             .isFalse();
     }
 
     @Test
-    public void hasEmptyNameInHierarchyShouldBeTrueIfEmptyPath() {
+    void hasEmptyNameInHierarchyShouldBeTrueIfEmptyPath() {
         assertThat(MailboxPath.forUser("user", "")
             .hasEmptyNameInHierarchy('.'))
             .isTrue();
     }
 
     @Test
-    public void hasEmptyNameInHierarchyShouldBeTrueIfPathWithTwoEmptyNames() {
+    void hasEmptyNameInHierarchyShouldBeTrueIfPathWithTwoEmptyNames() {
         assertThat(MailboxPath.forUser("user", ".")
             .hasEmptyNameInHierarchy('.'))
             .isTrue();
     }
 
     @Test
-    public void 
hasEmptyNameInHierarchyShouldBeTrueIfPathWithAnEmptyNameBetweenTwoNames() {
+    void 
hasEmptyNameInHierarchyShouldBeTrueIfPathWithAnEmptyNameBetweenTwoNames() {
         assertThat(MailboxPath.forUser("user", "a..b")
             .hasEmptyNameInHierarchy('.'))
             .isTrue();
     }
 
     @Test
-    public void 
hasEmptyNameInHierarchyShouldBeTrueIfPathWithHeadingEmptyNames() {
+    void hasEmptyNameInHierarchyShouldBeTrueIfPathWithHeadingEmptyNames() {
         assertThat(MailboxPath.forUser("user", "..a")
             .hasEmptyNameInHierarchy('.'))
             .isTrue();
     }
 
     @Test
-    public void 
hasEmptyNameInHierarchyShouldBeTrueIfPathWithATrailingEmptyName() {
+    void hasEmptyNameInHierarchyShouldBeTrueIfPathWithATrailingEmptyName() {
         assertThat(MailboxPath.forUser("user", "a.")
             .hasEmptyNameInHierarchy('.'))
             .isTrue();
     }
 
     @Test
-    public void 
hasEmptyNameInHierarchyShouldBeTrueIfPathWithTrailingEmptyNames() {
+    void hasEmptyNameInHierarchyShouldBeTrueIfPathWithTrailingEmptyNames() {
         assertThat(MailboxPath.forUser("user", "a..")
             .hasEmptyNameInHierarchy('.'))
             .isTrue();
     }
 
     @Test
-    public void isInboxShouldReturnTrueWhenINBOX() {
+    void isInboxShouldReturnTrueWhenINBOX() {
         MailboxPath mailboxPath = new 
MailboxPath(MailboxConstants.USER_NAMESPACE, "user", DefaultMailboxes.INBOX);
         assertThat(mailboxPath.isInbox()).isTrue();
     }
 
     @Test
-    public void isInboxShouldReturnTrueWhenINBOXWithOtherCase() {
+    void isInboxShouldReturnTrueWhenINBOXWithOtherCase() {
         MailboxPath mailboxPath = new 
MailboxPath(MailboxConstants.USER_NAMESPACE, "user", "InBoX");
         assertThat(mailboxPath.isInbox()).isTrue();
     }
 
     @Test
-    public void isInboxShouldReturnFalseWhenOtherThanInbox() {
+    void isInboxShouldReturnFalseWhenOtherThanInbox() {
         MailboxPath mailboxPath = new 
MailboxPath(MailboxConstants.USER_NAMESPACE, "user", DefaultMailboxes.ARCHIVE);
         assertThat(mailboxPath.isInbox()).isFalse();
     }
diff --git 
a/mailbox/api/src/test/java/org/apache/james/mailbox/model/MessageAttachmentTest.java
 
b/mailbox/api/src/test/java/org/apache/james/mailbox/model/MessageAttachmentTest.java
index 16828ae..edbc673 100644
--- 
a/mailbox/api/src/test/java/org/apache/james/mailbox/model/MessageAttachmentTest.java
+++ 
b/mailbox/api/src/test/java/org/apache/james/mailbox/model/MessageAttachmentTest.java
@@ -20,27 +20,30 @@
 package org.apache.james.mailbox.model;
 
 import static org.assertj.core.api.Assertions.assertThat;
+import static org.assertj.core.api.Assertions.assertThatThrownBy;
 
 import java.util.Optional;
 
-import org.junit.Test;
+import org.junit.jupiter.api.Test;
 
-public class MessageAttachmentTest {
+class MessageAttachmentTest {
 
-    @Test(expected = IllegalStateException.class)
-    public void buildShouldThrowWhenAttachmentIsNotGiven() {
-        MessageAttachment.builder()
-            .build();
+    @Test
+    void buildShouldThrowWhenAttachmentIsNotGiven() {
+        assertThatThrownBy(() -> MessageAttachment.builder()
+                .build())
+            .isInstanceOf(IllegalStateException.class);
     }
 
-    @Test(expected = IllegalArgumentException.class)
-    public void builderShouldThrowWhenAttachmentIsNull() {
-        MessageAttachment.builder()
-            .attachment(null);
+    @Test
+    void builderShouldThrowWhenAttachmentIsNull() {
+        assertThatThrownBy(() -> MessageAttachment.builder()
+                .attachment(null))
+            .isInstanceOf(IllegalArgumentException.class);
     }
 
     @Test
-    public void buildShouldWorkWhenMandatoryAttributesAreGiven() {
+    void buildShouldWorkWhenMandatoryAttributesAreGiven() {
         Attachment attachment = Attachment.builder()
                 .bytes("content".getBytes())
                 .type("type")
@@ -55,7 +58,7 @@ public class MessageAttachmentTest {
     }
 
     @Test
-    public void buildShouldAcceptIsInlineAndNoCid() {
+    void buildShouldAcceptIsInlineAndNoCid() {
         Attachment attachment = Attachment.builder()
                 .bytes("content".getBytes())
                 .type("type")
@@ -70,7 +73,7 @@ public class MessageAttachmentTest {
     }
 
     @Test
-    public void buildShouldSetAttributesWhenAllAreGiven() {
+    void buildShouldSetAttributesWhenAllAreGiven() {
         Attachment attachment = Attachment.builder()
                 .bytes("content".getBytes())
                 .type("type")
@@ -88,7 +91,7 @@ public class MessageAttachmentTest {
     }
 
     @Test
-    public void isInlinedWithCidShouldReturnTrueWhenIsInlineAndHasCid() throws 
Exception {
+    void isInlinedWithCidShouldReturnTrueWhenIsInlineAndHasCid() throws 
Exception {
         Attachment attachment = Attachment.builder()
             .bytes("content".getBytes())
             .type("type")
@@ -105,7 +108,7 @@ public class MessageAttachmentTest {
     }
 
     @Test
-    public void isInlinedWithCidShouldReturnFalseWhenIsNotInline() throws 
Exception {
+    void isInlinedWithCidShouldReturnFalseWhenIsNotInline() throws Exception {
         Attachment attachment = Attachment.builder()
             .bytes("content".getBytes())
             .type("type")
@@ -122,7 +125,7 @@ public class MessageAttachmentTest {
     }
 
     @Test
-    public void isInlinedWithCidShouldReturnFalseWhenIsInlineButNoCid() throws 
Exception {
+    void isInlinedWithCidShouldReturnFalseWhenIsInlineButNoCid() throws 
Exception {
         Attachment attachment = Attachment.builder()
             .bytes("content".getBytes())
             .type("type")
diff --git 
a/mailbox/api/src/test/java/org/apache/james/mailbox/model/MessageIdDtoTest.java
 
b/mailbox/api/src/test/java/org/apache/james/mailbox/model/MessageIdDtoTest.java
index 0c7e74d..e55022b 100644
--- 
a/mailbox/api/src/test/java/org/apache/james/mailbox/model/MessageIdDtoTest.java
+++ 
b/mailbox/api/src/test/java/org/apache/james/mailbox/model/MessageIdDtoTest.java
@@ -21,11 +21,11 @@ package org.apache.james.mailbox.model;
 import static org.assertj.core.api.Assertions.assertThat;
 import static org.assertj.core.api.Assertions.assertThatThrownBy;
 
-import org.junit.Test;
+import org.junit.jupiter.api.Test;
 
 import nl.jqno.equalsverifier.EqualsVerifier;
 
-public class MessageIdDtoTest {
+class MessageIdDtoTest {
 
     private static final TestMessageId.Factory factory = new 
TestMessageId.Factory();
     private static final Long SAMPLE_ID_VALUE = 42L;
@@ -33,37 +33,38 @@ public class MessageIdDtoTest {
     private static final TestMessageId SAMPLE_ID = 
TestMessageId.of(SAMPLE_ID_VALUE);
 
     @Test
-    public void shouldRespectJavaBeanContract() {
+    void shouldRespectJavaBeanContract() {
         EqualsVerifier.forClass(MessageIdDto.class).verify();
     }
 
     @Test
-    public void shouldAcceptStringAndGiveItBack() {
+    void shouldAcceptStringAndGiveItBack() {
         assertThat(new MessageIdDto(SAMPLE_ID_STRING).asString())
             .isEqualTo(SAMPLE_ID_STRING);
     }
 
     @Test
-    public void shouldAcceptMessageIdAndGiveTheRightString() {
+    void shouldAcceptMessageIdAndGiveTheRightString() {
         assertThat(new MessageIdDto(SAMPLE_ID).asString())
             .isEqualTo(SAMPLE_ID_STRING);
     }
 
     @Test
-    public void shouldAcceptMessageIdAndGiveItBack() {
+    void shouldAcceptMessageIdAndGiveItBack() {
         assertThat(new MessageIdDto(SAMPLE_ID).instantiate(factory))
             .isEqualTo(SAMPLE_ID);
     }
 
     @Test
-    public void shouldAcceptStringAndGiveAnInstantiatedMessageId() {
+    void shouldAcceptStringAndGiveAnInstantiatedMessageId() {
         assertThat(new MessageIdDto(SAMPLE_ID_STRING).instantiate(factory))
             .isEqualTo(SAMPLE_ID);
     }
 
     @Test
-    public void shouldThrowAnExceptionOnWronglyFormattedString() {
+    void shouldThrowAnExceptionOnWronglyFormattedString() {
         MessageIdDto messageIdDto = new MessageIdDto("Definitively not a 
number");
+
         assertThatThrownBy(() -> messageIdDto.instantiate(factory))
             .isInstanceOf(Exception.class);
     }
diff --git 
a/mailbox/api/src/test/java/org/apache/james/mailbox/model/MessageRangeTest.java
 
b/mailbox/api/src/test/java/org/apache/james/mailbox/model/MessageRangeTest.java
index 58e07d3..ab10eb0 100644
--- 
a/mailbox/api/src/test/java/org/apache/james/mailbox/model/MessageRangeTest.java
+++ 
b/mailbox/api/src/test/java/org/apache/james/mailbox/model/MessageRangeTest.java
@@ -1,155 +1,154 @@
-/****************************************************************
- * Licensed to the Apache Software Foundation (ASF) under one   *
- * or more contributor license agreements.  See the NOTICE file *
- * distributed with this work for additional information        *
- * regarding copyright ownership.  The ASF licenses this file   *
- * to you under the Apache License, Version 2.0 (the            *
- * "License"); you may not use this file except in compliance   *
- * with the License.  You may obtain a copy of the License at   *
- *                                                              *
- *   http://www.apache.org/licenses/LICENSE-2.0                 *
- *                                                              *
- * Unless required by applicable law or agreed to in writing,   *
- * software distributed under the License is distributed on an  *
- * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY       *
- * KIND, either express or implied.  See the License for the    *
- * specific language governing permissions and limitations      *
- * under the License.                                           *
- ****************************************************************/
-package org.apache.james.mailbox.model;
-
-import static org.assertj.core.api.Assertions.assertThat;
-
-import java.util.Arrays;
-import java.util.List;
-
-import org.apache.james.mailbox.MessageUid;
-import org.apache.james.mailbox.model.MessageRange;
-import org.junit.Test;
-
-public class MessageRangeTest {
-
-    @Test
-    public void givenSomeNumbersToRangeShouldReturnThreeRanges() {
-        List<MessageRange> ranges = MessageRange.toRanges(
-                Arrays.asList(
-                        MessageUid.of(1L),
-                        MessageUid.of(2L),
-                        MessageUid.of(3L),
-                        MessageUid.of(5L),
-                        MessageUid.of(6L),
-                        MessageUid.of(9L)));
-        assertThat(ranges).containsExactly(
-                MessageRange.range(MessageUid.of(1), MessageUid.of(3)), 
-                MessageRange.range(MessageUid.of(5), MessageUid.of(6)), 
-                MessageUid.of(9).toRange());
-    }
-    
-    @Test
-    public void givenASingleNumberToRangeShouldReturnOneRange() {
-        List<MessageRange> ranges = 
MessageRange.toRanges(Arrays.asList(MessageUid.of(1L)));
-        assertThat(ranges).containsExactly(MessageUid.of(1).toRange());
-    }
-    
-    // Test for MAILBOX-56
-    @Test
-    public void testTwoSeqUidToRange() {
-        List<MessageRange> ranges = 
MessageRange.toRanges(Arrays.asList(MessageUid.of(1L), MessageUid.of(2L)));
-        
assertThat(ranges).containsExactly(MessageRange.range(MessageUid.of(1), 
MessageUid.of(2)));
-    }
-    
-    @Test
-    public void splitASingletonRangeShouldReturnASingleRange() {
-        MessageRange one = MessageUid.of(1).toRange();
-        List<MessageRange> ranges = one.split(2);
-        assertThat(ranges).containsExactly(MessageUid.of(1).toRange());
-    }
-
-    @Test
-    public void splitUnboundedRangeShouldReturnTheSameRange() {
-        MessageRange from = MessageRange.from(MessageUid.of(1));
-        List<MessageRange> ranges = from.split(2);
-        
assertThat(ranges).containsExactly(MessageRange.from(MessageUid.of(1)));
-    }
-    
-    @Test
-    public void splitTenElementsRangeShouldReturn4Ranges() {
-        MessageRange range = 
MessageRange.range(MessageUid.of(1),MessageUid.of(10));
-        List<MessageRange> ranges = range.split(3);
-        assertThat(ranges).containsExactly(
-                MessageRange.range(MessageUid.of(1), MessageUid.of(3)), 
-                MessageRange.range(MessageUid.of(4), MessageUid.of(6)), 
-                MessageRange.range(MessageUid.of(7), MessageUid.of(9)), 
-                MessageUid.of(10).toRange());
-    }
-
-    @Test
-    public void includeShouldBeTrueWhenAfterFrom() {
-        MessageRange range = MessageRange.from(MessageUid.of(3));
-        boolean actual = range.includes(MessageUid.of(5));
-        assertThat(actual).isTrue();
-    }
-
-    @Test
-    public void includeShouldBeFalseWhenBeforeFrom() {
-        MessageRange range = MessageRange.from(MessageUid.of(3));
-        boolean actual = range.includes(MessageUid.of(1));
-        assertThat(actual).isFalse();
-    }
-
-    @Test
-    public void includeShouldBeTrueWhenEqualsFrom() {
-        MessageRange range = MessageRange.from(MessageUid.of(3));
-        boolean actual = range.includes(MessageUid.of(3));
-        assertThat(actual).isTrue();
-    }
-
-    @Test
-    public void includeShouldBeFalseWhenDifferentOne() {
-        MessageRange range = MessageUid.of(3).toRange();
-        boolean actual = range.includes(MessageUid.of(1));
-        assertThat(actual).isFalse();
-    }
-
-    @Test
-    public void includeShouldBeTrueWhenEqualsOne() {
-        MessageRange range = MessageUid.of(3).toRange();
-        boolean actual = range.includes(MessageUid.of(3));
-        assertThat(actual).isTrue();
-    }
-
-    @Test
-    public void includeShouldBeFalseWhenBeforeRange() {
-        MessageRange range = MessageRange.range(MessageUid.of(3), 
MessageUid.of(6));
-        boolean actual = range.includes(MessageUid.of(1));
-        assertThat(actual).isFalse();
-    }
-
-    @Test
-    public void includeShouldBeTrueWhenEqualsFromRange() {
-        MessageRange range = MessageRange.range(MessageUid.of(3), 
MessageUid.of(6));
-        boolean actual = range.includes(MessageUid.of(3));
-        assertThat(actual).isTrue();
-    }
-
-    @Test
-    public void includeShouldBeTrueWhenInRange() {
-        MessageRange range = MessageRange.range(MessageUid.of(3), 
MessageUid.of(6));
-        boolean actual = range.includes(MessageUid.of(4));
-        assertThat(actual).isTrue();
-    }
-
-    @Test
-    public void includeShouldBeTrueWhenEqualsToRange() {
-        MessageRange range = MessageRange.range(MessageUid.of(3), 
MessageUid.of(6));
-        boolean actual = range.includes(MessageUid.of(6));
-        assertThat(actual).isTrue();
-    }
-
-    @Test
-    public void includeShouldBeFalseWhenAfterRange() {
-        MessageRange range = MessageRange.range(MessageUid.of(3), 
MessageUid.of(6));
-        boolean actual = range.includes(MessageUid.of(7));
-        assertThat(actual).isFalse();
-    }
-}
+/****************************************************************
+ * Licensed to the Apache Software Foundation (ASF) under one   *
+ * or more contributor license agreements.  See the NOTICE file *
+ * distributed with this work for additional information        *
+ * regarding copyright ownership.  The ASF licenses this file   *
+ * to you under the Apache License, Version 2.0 (the            *
+ * "License"); you may not use this file except in compliance   *
+ * with the License.  You may obtain a copy of the License at   *
+ *                                                              *
+ *   http://www.apache.org/licenses/LICENSE-2.0                 *
+ *                                                              *
+ * Unless required by applicable law or agreed to in writing,   *
+ * software distributed under the License is distributed on an  *
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY       *
+ * KIND, either express or implied.  See the License for the    *
+ * specific language governing permissions and limitations      *
+ * under the License.                                           *
+ ****************************************************************/
+package org.apache.james.mailbox.model;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+import java.util.Arrays;
+import java.util.List;
+
+import org.apache.james.mailbox.MessageUid;
+import org.junit.jupiter.api.Test;
+
+class MessageRangeTest {
+
+    @Test
+    void givenSomeNumbersToRangeShouldReturnThreeRanges() {
+        List<MessageRange> ranges = MessageRange.toRanges(
+                Arrays.asList(
+                        MessageUid.of(1L),
+                        MessageUid.of(2L),
+                        MessageUid.of(3L),
+                        MessageUid.of(5L),
+                        MessageUid.of(6L),
+                        MessageUid.of(9L)));
+        assertThat(ranges).containsExactly(
+                MessageRange.range(MessageUid.of(1), MessageUid.of(3)), 
+                MessageRange.range(MessageUid.of(5), MessageUid.of(6)), 
+                MessageUid.of(9).toRange());
+    }
+    
+    @Test
+    void givenASingleNumberToRangeShouldReturnOneRange() {
+        List<MessageRange> ranges = 
MessageRange.toRanges(Arrays.asList(MessageUid.of(1L)));
+        assertThat(ranges).containsExactly(MessageUid.of(1).toRange());
+    }
+    
+    // Test for MAILBOX-56
+    @Test
+    void testTwoSeqUidToRange() {
+        List<MessageRange> ranges = 
MessageRange.toRanges(Arrays.asList(MessageUid.of(1L), MessageUid.of(2L)));
+        
assertThat(ranges).containsExactly(MessageRange.range(MessageUid.of(1), 
MessageUid.of(2)));
+    }
+    
+    @Test
+    void splitASingletonRangeShouldReturnASingleRange() {
+        MessageRange one = MessageUid.of(1).toRange();
+        List<MessageRange> ranges = one.split(2);
+        assertThat(ranges).containsExactly(MessageUid.of(1).toRange());
+    }
+
+    @Test
+    void splitUnboundedRangeShouldReturnTheSameRange() {
+        MessageRange from = MessageRange.from(MessageUid.of(1));
+        List<MessageRange> ranges = from.split(2);
+        
assertThat(ranges).containsExactly(MessageRange.from(MessageUid.of(1)));
+    }
+    
+    @Test
+    void splitTenElementsRangeShouldReturn4Ranges() {
+        MessageRange range = 
MessageRange.range(MessageUid.of(1),MessageUid.of(10));
+        List<MessageRange> ranges = range.split(3);
+        assertThat(ranges).containsExactly(
+                MessageRange.range(MessageUid.of(1), MessageUid.of(3)), 
+                MessageRange.range(MessageUid.of(4), MessageUid.of(6)), 
+                MessageRange.range(MessageUid.of(7), MessageUid.of(9)), 
+                MessageUid.of(10).toRange());
+    }
+
+    @Test
+    void includeShouldBeTrueWhenAfterFrom() {
+        MessageRange range = MessageRange.from(MessageUid.of(3));
+        boolean actual = range.includes(MessageUid.of(5));
+        assertThat(actual).isTrue();
+    }
+
+    @Test
+    void includeShouldBeFalseWhenBeforeFrom() {
+        MessageRange range = MessageRange.from(MessageUid.of(3));
+        boolean actual = range.includes(MessageUid.of(1));
+        assertThat(actual).isFalse();
+    }
+
+    @Test
+    void includeShouldBeTrueWhenEqualsFrom() {
+        MessageRange range = MessageRange.from(MessageUid.of(3));
+        boolean actual = range.includes(MessageUid.of(3));
+        assertThat(actual).isTrue();
+    }
+
+    @Test
+    void includeShouldBeFalseWhenDifferentOne() {
+        MessageRange range = MessageUid.of(3).toRange();
+        boolean actual = range.includes(MessageUid.of(1));
+        assertThat(actual).isFalse();
+    }
+
+    @Test
+    void includeShouldBeTrueWhenEqualsOne() {
+        MessageRange range = MessageUid.of(3).toRange();
+        boolean actual = range.includes(MessageUid.of(3));
+        assertThat(actual).isTrue();
+    }
+
+    @Test
+    void includeShouldBeFalseWhenBeforeRange() {
+        MessageRange range = MessageRange.range(MessageUid.of(3), 
MessageUid.of(6));
+        boolean actual = range.includes(MessageUid.of(1));
+        assertThat(actual).isFalse();
+    }
+
+    @Test
+    void includeShouldBeTrueWhenEqualsFromRange() {
+        MessageRange range = MessageRange.range(MessageUid.of(3), 
MessageUid.of(6));
+        boolean actual = range.includes(MessageUid.of(3));
+        assertThat(actual).isTrue();
+    }
+
+    @Test
+    void includeShouldBeTrueWhenInRange() {
+        MessageRange range = MessageRange.range(MessageUid.of(3), 
MessageUid.of(6));
+        boolean actual = range.includes(MessageUid.of(4));
+        assertThat(actual).isTrue();
+    }
+
+    @Test
+    void includeShouldBeTrueWhenEqualsToRange() {
+        MessageRange range = MessageRange.range(MessageUid.of(3), 
MessageUid.of(6));
+        boolean actual = range.includes(MessageUid.of(6));
+        assertThat(actual).isTrue();
+    }
+
+    @Test
+    void includeShouldBeFalseWhenAfterRange() {
+        MessageRange range = MessageRange.range(MessageUid.of(3), 
MessageUid.of(6));
+        boolean actual = range.includes(MessageUid.of(7));
+        assertThat(actual).isFalse();
+    }
+}
diff --git 
a/mailbox/api/src/test/java/org/apache/james/mailbox/model/MultimailboxesSearchQueryTest.java
 
b/mailbox/api/src/test/java/org/apache/james/mailbox/model/MultimailboxesSearchQueryTest.java
index 8430f08..9f08817 100644
--- 
a/mailbox/api/src/test/java/org/apache/james/mailbox/model/MultimailboxesSearchQueryTest.java
+++ 
b/mailbox/api/src/test/java/org/apache/james/mailbox/model/MultimailboxesSearchQueryTest.java
@@ -19,76 +19,84 @@
 package org.apache.james.mailbox.model;
 
 import static org.assertj.core.api.Assertions.assertThat;
+import static org.assertj.core.api.Assertions.assertThatThrownBy;
 
-import org.junit.Test;
+import org.junit.jupiter.api.Test;
 
 import com.google.common.collect.ImmutableSet;
 
-public class MultimailboxesSearchQueryTest {
+class MultimailboxesSearchQueryTest {
 
     private static final SearchQuery EMPTY_QUERY = new SearchQuery();
     private static final TestId.Factory FACTORY = new TestId.Factory();
     private static final MailboxId ID_1 = FACTORY.fromString("1");
     private static final MailboxId ID_2 = FACTORY.fromString("2");
 
-    @Test(expected = NullPointerException.class)
-    public void buildShouldThrowWhenQueryIsNull() {
-        MultimailboxesSearchQuery.from(null);
+    @Test
+    void buildShouldThrowWhenQueryIsNull() {
+        assertThatThrownBy(() -> MultimailboxesSearchQuery.from(null))
+            .isInstanceOf(NullPointerException.class);
     }
 
     @Test
-    public void buildShouldBuildWheninMailboxes() {
+    void buildShouldBuildWheninMailboxes() {
         ImmutableSet<MailboxId> inMailboxes = ImmutableSet.of();
         ImmutableSet<MailboxId> notInMailboxes = ImmutableSet.of();
         MultimailboxesSearchQuery expected = new 
MultimailboxesSearchQuery(EMPTY_QUERY, inMailboxes, notInMailboxes);
         MultimailboxesSearchQuery actual = 
MultimailboxesSearchQuery.from(EMPTY_QUERY).build();
+
         assertThat(actual).isEqualToComparingFieldByField(expected);
     }
 
     @Test
-    public void buildShouldBuildWhenEmptyMailboxes() {
+    void buildShouldBuildWhenEmptyMailboxes() {
         ImmutableSet<MailboxId> inMailboxes = ImmutableSet.of();
         ImmutableSet<MailboxId> notInMailboxes = ImmutableSet.of();
         MultimailboxesSearchQuery expected = new 
MultimailboxesSearchQuery(EMPTY_QUERY, inMailboxes, notInMailboxes);
         MultimailboxesSearchQuery actual = 
MultimailboxesSearchQuery.from(EMPTY_QUERY).inMailboxes().build();
+
         assertThat(actual).isEqualToComparingFieldByField(expected);
     }
 
     @Test
-    public void buildShouldBuildWhenEmptyNotInMailboxes() {
+    void buildShouldBuildWhenEmptyNotInMailboxes() {
         ImmutableSet<MailboxId> inMailboxes = ImmutableSet.of();
         ImmutableSet<MailboxId> notInMailboxes = ImmutableSet.of();
         MultimailboxesSearchQuery expected = new 
MultimailboxesSearchQuery(EMPTY_QUERY, inMailboxes, notInMailboxes);
         MultimailboxesSearchQuery actual = 
MultimailboxesSearchQuery.from(EMPTY_QUERY).notInMailboxes().build();
+
         assertThat(actual).isEqualToComparingFieldByField(expected);
     }
 
     
     @Test
-    public void buildShouldBuildWhenOneMailbox() {
+    void buildShouldBuildWhenOneMailbox() {
         ImmutableSet<MailboxId> inMailboxes = ImmutableSet.of(ID_1);
         ImmutableSet<MailboxId> notInMailboxes = ImmutableSet.of();
         MultimailboxesSearchQuery expected = new 
MultimailboxesSearchQuery(EMPTY_QUERY, inMailboxes, notInMailboxes);
         MultimailboxesSearchQuery actual = 
MultimailboxesSearchQuery.from(EMPTY_QUERY).inMailboxes(ID_1).build();
+
         assertThat(actual).isEqualToComparingFieldByField(expected);
     }
 
     @Test
-    public void buildShouldBuildWhenOneNotInMailbox() {
+    void buildShouldBuildWhenOneNotInMailbox() {
         ImmutableSet<MailboxId> inMailboxes = ImmutableSet.of();
         ImmutableSet<MailboxId> notInMailboxes = ImmutableSet.of(ID_1);
         MultimailboxesSearchQuery expected = new 
MultimailboxesSearchQuery(EMPTY_QUERY, inMailboxes, notInMailboxes);
         MultimailboxesSearchQuery actual = 
MultimailboxesSearchQuery.from(EMPTY_QUERY).notInMailboxes(ID_1).build();
+
         assertThat(actual).isEqualToComparingFieldByField(expected);
     }
 
     
     @Test
-    public void buildShouldBuildWhenAllDefined() {
+    void buildShouldBuildWhenAllDefined() {
         ImmutableSet<MailboxId> inMailboxes = ImmutableSet.of(ID_1);
         ImmutableSet<MailboxId> notInMailboxes = ImmutableSet.of(ID_2);
         MultimailboxesSearchQuery expected = new 
MultimailboxesSearchQuery(EMPTY_QUERY, inMailboxes, notInMailboxes);
         MultimailboxesSearchQuery actual = 
MultimailboxesSearchQuery.from(EMPTY_QUERY).inMailboxes(ID_1).notInMailboxes(ID_2).build();
+        
         assertThat(actual).isEqualToComparingFieldByField(expected);
     }
 
diff --git 
a/mailbox/api/src/test/java/org/apache/james/mailbox/model/QuotaTest.java 
b/mailbox/api/src/test/java/org/apache/james/mailbox/model/QuotaTest.java
index e11ebdc..f1633bc 100644
--- a/mailbox/api/src/test/java/org/apache/james/mailbox/model/QuotaTest.java
+++ b/mailbox/api/src/test/java/org/apache/james/mailbox/model/QuotaTest.java
@@ -24,69 +24,69 @@ import static 
org.assertj.core.api.Assertions.assertThatThrownBy;
 
 import org.apache.james.core.quota.QuotaCount;
 import org.apache.james.core.quota.QuotaSize;
-import org.junit.Test;
+import org.junit.jupiter.api.Test;
 
-public class QuotaTest {
+class QuotaTest {
 
 
     @Test
-    public void isOverQuotaShouldReturnFalseWhenQuotaIsNotExceeded() {
+    void isOverQuotaShouldReturnFalseWhenQuotaIsNotExceeded() {
         Quota<QuotaCount> quota = 
Quota.<QuotaCount>builder().used(QuotaCount.count(36)).computedLimit(QuotaCount.count(360)).build();
         assertThat(quota.isOverQuota()).isFalse();
     }
 
     @Test
-    public void isOverQuotaShouldReturnFalseWhenMaxValueIsUnlimited() {
+    void isOverQuotaShouldReturnFalseWhenMaxValueIsUnlimited() {
         Quota<QuotaCount> quota = 
Quota.<QuotaCount>builder().used(QuotaCount.count(36)).computedLimit(QuotaCount.unlimited()).build();
         assertThat(quota.isOverQuota()).isFalse();
     }
 
     @Test
-    public void isOverQuotaShouldReturnTrueWhenQuotaIsExceeded() {
+    void isOverQuotaShouldReturnTrueWhenQuotaIsExceeded() {
         Quota<QuotaCount> quota = 
Quota.<QuotaCount>builder().used(QuotaCount.count(360)).computedLimit(QuotaCount.count(36)).build();
         assertThat(quota.isOverQuota()).isTrue();
     }
 
     @Test
-    public void isOverQuotaWithAdditionalValueShouldReturnTrueWhenOverLimit() {
+    void isOverQuotaWithAdditionalValueShouldReturnTrueWhenOverLimit() {
         Quota<QuotaCount> quota = 
Quota.<QuotaCount>builder().used(QuotaCount.count(36)).computedLimit(QuotaCount.count(36)).build();
         assertThat(quota.isOverQuotaWithAdditionalValue(1)).isTrue();
     }
 
     @Test
-    public void isOverQuotaWithAdditionalValueShouldReturnTrueWhenUnderLimit() 
{
+    void isOverQuotaWithAdditionalValueShouldReturnTrueWhenUnderLimit() {
         Quota<QuotaCount> quota = 
Quota.<QuotaCount>builder().used(QuotaCount.count(34)).computedLimit(QuotaCount.count(36)).build();
         assertThat(quota.isOverQuotaWithAdditionalValue(1)).isFalse();
     }
 
     @Test
-    public void isOverQuotaWithAdditionalValueShouldReturnFalseWhenAtLimit() {
+    void isOverQuotaWithAdditionalValueShouldReturnFalseWhenAtLimit() {
         Quota<QuotaCount> quota = 
Quota.<QuotaCount>builder().used(QuotaCount.count(36)).computedLimit(QuotaCount.count(36)).build();
         assertThat(quota.isOverQuotaWithAdditionalValue(0)).isFalse();
     }
 
     @Test
-    public void isOverQuotaWithAdditionalValueShouldThrowOnNegativeValue() {
+    void isOverQuotaWithAdditionalValueShouldThrowOnNegativeValue() {
         Quota<QuotaCount> quota = 
Quota.<QuotaCount>builder().used(QuotaCount.count(25)).computedLimit(QuotaCount.count(36)).build();
         assertThatThrownBy(() -> 
quota.isOverQuotaWithAdditionalValue(-1)).isInstanceOf(IllegalArgumentException.class);
     }
 
     @Test
-    public void buildShouldThrowOnMissingUsedValue() {
+    void buildShouldThrowOnMissingUsedValue() {
         assertThatThrownBy(
             () -> 
Quota.<QuotaCount>builder().computedLimit(QuotaCount.count(1)).build())
             .isInstanceOf(IllegalStateException.class);
     }
 
     @Test
-    public void buildShouldThrowOnMissingComputedLimitValue() {
+    void buildShouldThrowOnMissingComputedLimitValue() {
         assertThatThrownBy(
             () -> 
Quota.<QuotaCount>builder().used(QuotaCount.count(1)).build())
             .isInstanceOf(IllegalStateException.class);
     }
 
     @Test
-    public void buildShouldCreateValidObjectGivenMandatoryFields() {
+    void buildShouldCreateValidObjectGivenMandatoryFields() {
         Quota<QuotaCount> actual = Quota.<QuotaCount>builder()
             .used(QuotaCount.count(1))
             .computedLimit(QuotaCount.count(2))
@@ -95,7 +95,7 @@ public class QuotaTest {
     }
 
     @Test
-    public void getRatioShouldReturnUsedDividedByLimit() {
+    void getRatioShouldReturnUsedDividedByLimit() {
         assertThat(
             Quota.<QuotaSize>builder()
                 .used(QuotaSize.size(15))
@@ -106,7 +106,7 @@ public class QuotaTest {
     }
 
     @Test
-    public void getRatioShouldReturnZeroWhenUnlimited() {
+    void getRatioShouldReturnZeroWhenUnlimited() {
         assertThat(
             Quota.<QuotaSize>builder()
                 .used(QuotaSize.size(15))
diff --git 
a/mailbox/api/src/test/java/org/apache/james/mailbox/model/Rfc4314RightsTest.java
 
b/mailbox/api/src/test/java/org/apache/james/mailbox/model/Rfc4314RightsTest.java
index 46c069c..8f54432 100644
--- 
a/mailbox/api/src/test/java/org/apache/james/mailbox/model/Rfc4314RightsTest.java
+++ 
b/mailbox/api/src/test/java/org/apache/james/mailbox/model/Rfc4314RightsTest.java
@@ -36,10 +36,10 @@ import static 
org.assertj.core.api.Assertions.assertThatThrownBy;
 
 import org.apache.james.mailbox.exception.UnsupportedRightException;
 import org.apache.james.mailbox.model.MailboxACL.Rfc4314Rights;
-import org.junit.Before;
-import org.junit.Test;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
 
-public class Rfc4314RightsTest {
+class Rfc4314RightsTest {
     
     private Rfc4314Rights aeik;
     private Rfc4314Rights lprs;
@@ -47,8 +47,8 @@ public class Rfc4314RightsTest {
     private Rfc4314Rights full;
     private Rfc4314Rights none;
     
-    @Before
-    public void setUp() throws Exception {
+    @BeforeEach
+    void setUp() throws Exception {
         aeik = Rfc4314Rights.fromSerializedRfc4314Rights("aeik");
         lprs = Rfc4314Rights.fromSerializedRfc4314Rights("lprs");
         twx = Rfc4314Rights.fromSerializedRfc4314Rights("twx");
@@ -56,55 +56,56 @@ public class Rfc4314RightsTest {
         none = MailboxACL.NO_RIGHTS;
     }
     
-    @Test(expected = NullPointerException.class)
-    public void newInstanceShouldThrowWhenNullString() throws 
UnsupportedRightException {
-        Rfc4314Rights.fromSerializedRfc4314Rights((String) null);
+    @Test
+    void newInstanceShouldThrowWhenNullString() throws 
UnsupportedRightException {
+        assertThatThrownBy(() -> 
Rfc4314Rights.fromSerializedRfc4314Rights((String) null))
+            .isInstanceOf(NullPointerException.class);
     }
     
     @Test
-    public void newInstanceShouldHaveNoRightsWhenEmptyString() throws 
UnsupportedRightException {
+    void newInstanceShouldHaveNoRightsWhenEmptyString() throws 
UnsupportedRightException {
         Rfc4314Rights rights = Rfc4314Rights.fromSerializedRfc4314Rights("");
         assertThat(rights.list()).isEmpty();
     }
     
     @Test
-    public void containsShouldReturnFalseWhenNotMatching() throws 
UnsupportedRightException {
+    void containsShouldReturnFalseWhenNotMatching() throws 
UnsupportedRightException {
         assertThat(aeik.contains('x')).isFalse();
     }
     
     @Test
-    public void containsShouldReturnTrueWhenMatching() throws 
UnsupportedRightException {
+    void containsShouldReturnTrueWhenMatching() throws 
UnsupportedRightException {
         assertThat(aeik.contains('e')).isTrue();
     }
     
     @Test
-    public void exceptShouldRemoveAllWhenChaining() throws 
UnsupportedRightException {
+    void exceptShouldRemoveAllWhenChaining() throws UnsupportedRightException {
         assertThat(full.except(aeik).except(lprs).except(twx)).isEqualTo(none);
     }
     
     @Test
-    public void exceptShouldReturnOriginWhenExceptingNull() throws 
UnsupportedRightException {
+    void exceptShouldReturnOriginWhenExceptingNull() throws 
UnsupportedRightException {
         assertThat(aeik.except(null)).isEqualTo(aeik);
     }
     
     @Test
-    public void exceptShouldReturnOriginWhenExceptingNonExistent() throws 
UnsupportedRightException {
+    void exceptShouldReturnOriginWhenExceptingNonExistent() throws 
UnsupportedRightException {
         assertThat(aeik.except(lprs)).isEqualTo(aeik);
     }
 
     @Test
-    public void rfc4314RightsShouldThrowWhenUnknownFlag() throws 
UnsupportedRightException {
+    void rfc4314RightsShouldThrowWhenUnknownFlag() {
         assertThatThrownBy(() -> 
Rfc4314Rights.fromSerializedRfc4314Rights("z"))
             .isInstanceOf(UnsupportedRightException.class);
     }
     
     @Test
-    public void exceptShouldReturnOriginWhenExceptingEmpty() throws 
UnsupportedRightException {
+    void exceptShouldReturnOriginWhenExceptingEmpty() throws 
UnsupportedRightException {
         assertThat(aeik.except(none)).isEqualTo(aeik);
     }
     
     @Test
-    public void fullRightsShouldContainsAllRights() {
+    void fullRightsShouldContainsAllRights() {
         assertThat(full.list()).containsOnly(
             Administer,
             PerformExpunge,
@@ -120,12 +121,12 @@ public class Rfc4314RightsTest {
     }
     
     @Test
-    public void noneRightsShouldContainsNoRights() {
+    void noneRightsShouldContainsNoRights() {
         assertThat(none.list()).isEmpty();
     }
     
     @Test
-    public void rightsShouldContainsSpecificRightsWhenAEIK() {
+    void rightsShouldContainsSpecificRightsWhenAEIK() {
         assertThat(aeik.list()).containsOnly(
             Administer,
             PerformExpunge,
@@ -134,7 +135,7 @@ public class Rfc4314RightsTest {
     }
     
     @Test
-    public void rightsShouldContainsSpecificRightsWhenLPRS() {
+    void rightsShouldContainsSpecificRightsWhenLPRS() {
         assertThat(lprs.list()).containsOnly(
             Lookup,
             Post,
@@ -143,7 +144,7 @@ public class Rfc4314RightsTest {
     }
     
     @Test
-    public void rightsShouldContainsSpecificRightsWhenTWX() {
+    void rightsShouldContainsSpecificRightsWhenTWX() {
         assertThat(twx.list()).containsOnly(
             DeleteMessages,
             Write,
@@ -151,92 +152,92 @@ public class Rfc4314RightsTest {
     }
 
     @Test
-    public void getValueShouldReturnSigmaWhenAeik() throws 
UnsupportedRightException {
+    void getValueShouldReturnSigmaWhenAeik() {
         assertThat(aeik.list()).containsExactly(Administer, PerformExpunge, 
Insert, CreateMailbox);
     }
 
     @Test
-    public void getValueShouldReturnSigmaWhenLprs() throws 
UnsupportedRightException {
+    void getValueShouldReturnSigmaWhenLprs() {
         assertThat(lprs.list()).containsExactly(Lookup, Post, Read, 
WriteSeenFlag);
     }
 
     @Test
-    public void getValueShouldReturnSigmaWhenTwx() throws 
UnsupportedRightException {
+    void getValueShouldReturnSigmaWhenTwx() {
         assertThat(twx.list()).containsExactly(DeleteMessages, Write, 
DeleteMailbox);
     }
 
     @Test
-    public void getValueShouldReturnEmptyWhenNone() throws 
UnsupportedRightException {
+    void getValueShouldReturnEmptyWhenNone() throws UnsupportedRightException {
         
assertThat(Rfc4314Rights.fromSerializedRfc4314Rights("").list()).isEmpty();
     }
 
     @Test
-    public void serializeShouldReturnStringWhenAeik() throws 
UnsupportedRightException {
+    void serializeShouldReturnStringWhenAeik() {
         assertThat(aeik.serialize()).isEqualTo("aeik");
     }
 
     @Test
-    public void serializeShouldReturnStringWhenLprs() throws 
UnsupportedRightException {
+    void serializeShouldReturnStringWhenLprs() {
         assertThat(lprs.serialize()).isEqualTo("lprs");
     }
 
     @Test
-    public void serializeShouldReturnStringWhenTwx() throws 
UnsupportedRightException {
+    void serializeShouldReturnStringWhenTwx() {
         assertThat(twx.serialize()).isEqualTo("twx");
     }
     
     @Test
-    public void serializeShouldReturnStringWhenAeiklprstwx() throws 
UnsupportedRightException {
+    void serializeShouldReturnStringWhenAeiklprstwx() {
         assertThat(full.serialize()).isEqualTo("aeiklprstwx");
     }
 
     @Test
-    public void serializeShouldReturnEmptyStringWhenEmpty() throws 
UnsupportedRightException {
+    void serializeShouldReturnEmptyStringWhenEmpty() {
         assertThat(none.serialize()).isEmpty();
     }
     
     @Test
-    public void unionShouldReturnFullWhenChaining() throws 
UnsupportedRightException {
+    void unionShouldReturnFullWhenChaining() throws UnsupportedRightException {
         assertThat(aeik.union(lprs).union(twx)).isEqualTo(full);
     }
     
     @Test
-    public void unionShouldReturnOriginWhenAppliedWithEmpty() throws 
UnsupportedRightException {
+    void unionShouldReturnOriginWhenAppliedWithEmpty() throws 
UnsupportedRightException {
         assertThat(lprs.union(none)).isEqualTo(lprs);
     }
     
     @Test
-    public void unionShouldThrowWhenAppliedWithNull() throws 
UnsupportedRightException {
+    void unionShouldThrowWhenAppliedWithNull() {
         assertThatThrownBy(() -> 
lprs.union(null)).isInstanceOf(NullPointerException.class);
     }
 
     @Test
-    public void containsShouldReturnFalseWhenRightNotPresent() throws 
UnsupportedRightException {
+    void containsShouldReturnFalseWhenRightNotPresent() {
         assertThat(lprs.contains(Write)).isFalse();
     }
 
     @Test
-    public void containsShouldReturnFalseWhenAtLeastOneRightNotPresent() 
throws UnsupportedRightException {
+    void containsShouldReturnFalseWhenAtLeastOneRightNotPresent() {
         assertThat(lprs.contains(Lookup, Write)).isFalse();
     }
 
     @Test
-    public void containsShouldReturnTrueWhenAllRightsPresent() throws 
UnsupportedRightException {
+    void containsShouldReturnTrueWhenAllRightsPresent() {
         assertThat(lprs.contains(Lookup, Post)).isTrue();
     }
 
     @Test
-    public void containsShouldReturnTrueWhenNonRightsPresent() throws 
UnsupportedRightException {
+    void containsShouldReturnTrueWhenNonRightsPresent() {
         assertThat(lprs.contains()).isTrue();
     }
 
     @Test
-    public void allExceptShouldReturnFullWhenProvidedEmpty() throws 
UnsupportedRightException {
+    void allExceptShouldReturnFullWhenProvidedEmpty() throws 
UnsupportedRightException {
         
assertThat(Rfc4314Rights.allExcept()).isEqualTo(MailboxACL.FULL_RIGHTS);
     }
 
     @Test
-    public void allExceptShouldReturnAllButProvidedRight() throws 
UnsupportedRightException {
+    void allExceptShouldReturnAllButProvidedRight() throws 
UnsupportedRightException {
         assertThat(Rfc4314Rights.allExcept(Lookup))
             .isEqualTo(new Rfc4314Rights(
                 DeleteMessages,
@@ -252,7 +253,7 @@ public class Rfc4314RightsTest {
     }
 
     @Test
-    public void allExceptShouldReturnAllButProvidedRights() throws 
UnsupportedRightException {
+    void allExceptShouldReturnAllButProvidedRights() throws 
UnsupportedRightException {
         assertThat(Rfc4314Rights.allExcept(Lookup, Read))
             .isEqualTo(new Rfc4314Rights(
                 DeleteMessages,
@@ -267,7 +268,7 @@ public class Rfc4314RightsTest {
     }
 
     @Test
-    public void allExceptShouldReturnEmptyWhenProvidedAllRights() throws 
UnsupportedRightException {
+    void allExceptShouldReturnEmptyWhenProvidedAllRights() throws 
UnsupportedRightException {
         assertThat(
             Rfc4314Rights.allExcept(
                 Lookup,
diff --git 
a/mailbox/api/src/test/java/org/apache/james/mailbox/model/SearchQueryTest.java 
b/mailbox/api/src/test/java/org/apache/james/mailbox/model/SearchQueryTest.java
index b5725a6..2011617 100644
--- 
a/mailbox/api/src/test/java/org/apache/james/mailbox/model/SearchQueryTest.java
+++ 
b/mailbox/api/src/test/java/org/apache/james/mailbox/model/SearchQueryTest.java
@@ -22,21 +22,21 @@ package org.apache.james.mailbox.model;
 
 import static org.assertj.core.api.Assertions.assertThat;
 
-import org.junit.Test;
+import org.junit.jupiter.api.Test;
 
 import nl.jqno.equalsverifier.EqualsVerifier;
 
-public class SearchQueryTest {
+class SearchQueryTest {
 
     @Test
-    public void searchQueryShouldRespectBeanContract() {
+    void searchQueryShouldRespectBeanContract() {
         EqualsVerifier.forClass(SearchQuery.class)
             .withOnlyTheseFields("criterias")
             .verify();
     }
 
     @Test
-    public void equalsShouldCompareCriteria() {
+    void equalsShouldCompareCriteria() {
         SearchQuery searchQuery1 = new SearchQuery();
         SearchQuery searchQuery2 = new SearchQuery();
         searchQuery1.andCriteria(SearchQuery.all());
diff --git 
a/mailbox/api/src/test/java/org/apache/james/mailbox/model/UpdatedFlagsTest.java
 
b/mailbox/api/src/test/java/org/apache/james/mailbox/model/UpdatedFlagsTest.java
index e79e566..1c81a4d 100644
--- 
a/mailbox/api/src/test/java/org/apache/james/mailbox/model/UpdatedFlagsTest.java
+++ 
b/mailbox/api/src/test/java/org/apache/james/mailbox/model/UpdatedFlagsTest.java
@@ -24,24 +24,24 @@ import static org.assertj.core.api.Assertions.assertThat;
 import javax.mail.Flags;
 
 import org.apache.james.mailbox.MessageUid;
-import org.junit.Test;
+import org.junit.jupiter.api.Test;
 
 import nl.jqno.equalsverifier.EqualsVerifier;
 
-public class UpdatedFlagsTest {
+class UpdatedFlagsTest {
 
     public static final MessageUid UID = MessageUid.of(45L);
     public static final long MOD_SEQ = 47L;
 
     @Test
-    public void shouldMatchBeanContract() {
+    void shouldMatchBeanContract() {
         EqualsVerifier.forClass(UpdatedFlags.class)
             .withIgnoredFields("modifiedFlags")
             .verify();
     }
 
     @Test
-    public void isModifiedToSetShouldReturnTrueWhenFlagOnlyInNewFlag() {
+    void isModifiedToSetShouldReturnTrueWhenFlagOnlyInNewFlag() {
         UpdatedFlags updatedFlags = UpdatedFlags.builder()
             .newFlags(new Flags(Flags.Flag.RECENT))
             .oldFlags(new Flags())
@@ -53,7 +53,7 @@ public class UpdatedFlagsTest {
     }
 
     @Test
-    public void isModifiedToSetShouldReturnFalseWhenFlagOnlyInOldFlag() {
+    void isModifiedToSetShouldReturnFalseWhenFlagOnlyInOldFlag() {
         UpdatedFlags updatedFlags = UpdatedFlags.builder()
             .newFlags(new Flags())
             .oldFlags(new Flags(Flags.Flag.RECENT))
@@ -65,7 +65,7 @@ public class UpdatedFlagsTest {
     }
 
     @Test
-    public void isModifiedToSetShouldReturnFalseWhenFlagIsOnNone() {
+    void isModifiedToSetShouldReturnFalseWhenFlagIsOnNone() {
         UpdatedFlags updatedFlags = UpdatedFlags.builder()
             .newFlags(new Flags())
             .oldFlags(new Flags())
@@ -77,7 +77,7 @@ public class UpdatedFlagsTest {
     }
 
     @Test
-    public void isModifiedToSetShouldReturnFalseWhenFlagIsOnBoth() {
+    void isModifiedToSetShouldReturnFalseWhenFlagIsOnBoth() {
         UpdatedFlags updatedFlags = UpdatedFlags.builder()
             .newFlags(new Flags(Flags.Flag.RECENT))
             .oldFlags(new Flags(Flags.Flag.RECENT))
@@ -89,7 +89,7 @@ public class UpdatedFlagsTest {
     }
 
     @Test
-    public void isModifiedToUnsetShouldReturnFalseWhenFlagOnlyInNewFlag() {
+    void isModifiedToUnsetShouldReturnFalseWhenFlagOnlyInNewFlag() {
         UpdatedFlags updatedFlags = UpdatedFlags.builder()
             .newFlags(new Flags(Flags.Flag.RECENT))
             .oldFlags(new Flags())
@@ -101,7 +101,7 @@ public class UpdatedFlagsTest {
     }
 
     @Test
-    public void isModifiedToUnsetShouldReturnTrueWhenFlagOnlyInOldFlag() {
+    void isModifiedToUnsetShouldReturnTrueWhenFlagOnlyInOldFlag() {
         UpdatedFlags updatedFlags = UpdatedFlags.builder()
             .newFlags(new Flags())
             .oldFlags(new Flags(Flags.Flag.RECENT))
@@ -113,7 +113,7 @@ public class UpdatedFlagsTest {
     }
 
     @Test
-    public void isModifiedToUnsetShouldReturnFalseWhenFlagIsOnNone() {
+    void isModifiedToUnsetShouldReturnFalseWhenFlagIsOnNone() {
         UpdatedFlags updatedFlags = UpdatedFlags.builder()
             .newFlags(new Flags())
             .oldFlags(new Flags())
@@ -125,7 +125,7 @@ public class UpdatedFlagsTest {
     }
 
     @Test
-    public void isModifiedToUnsetShouldReturnFalseWhenFlagIsOnBoth() {
+    void isModifiedToUnsetShouldReturnFalseWhenFlagIsOnBoth() {
         UpdatedFlags updatedFlags = UpdatedFlags.builder()
             .newFlags(new Flags(Flags.Flag.RECENT))
             .oldFlags(new Flags(Flags.Flag.RECENT))
@@ -137,7 +137,7 @@ public class UpdatedFlagsTest {
     }
 
     @Test
-    public void isUnchangedShouldReturnFalseWhenFlagOnlyInNewFlag() {
+    void isUnchangedShouldReturnFalseWhenFlagOnlyInNewFlag() {
         UpdatedFlags updatedFlags = UpdatedFlags.builder()
             .newFlags(new Flags(Flags.Flag.RECENT))
             .oldFlags(new Flags())
@@ -149,7 +149,7 @@ public class UpdatedFlagsTest {
     }
 
     @Test
-    public void isUnchangedShouldReturnFalseWhenFlagOnlyInOldFlag() {
+    void isUnchangedShouldReturnFalseWhenFlagOnlyInOldFlag() {
         UpdatedFlags updatedFlags = UpdatedFlags.builder()
             .newFlags(new Flags())
             .oldFlags(new Flags(Flags.Flag.RECENT))
@@ -161,7 +161,7 @@ public class UpdatedFlagsTest {
     }
 
     @Test
-    public void isUnchangedShouldReturnTrueWhenFlagIsOnNone() {
+    void isUnchangedShouldReturnTrueWhenFlagIsOnNone() {
         UpdatedFlags updatedFlags = UpdatedFlags.builder()
             .newFlags(new Flags())
             .oldFlags(new Flags())
@@ -173,7 +173,7 @@ public class UpdatedFlagsTest {
     }
 
     @Test
-    public void isUnchangedShouldReturnTrueWhenFlagIsOnBoth() {
+    void isUnchangedShouldReturnTrueWhenFlagIsOnBoth() {
         UpdatedFlags updatedFlags = UpdatedFlags.builder()
             .newFlags(new Flags(Flags.Flag.RECENT))
             .oldFlags(new Flags(Flags.Flag.RECENT))


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