kbendick commented on a change in pull request #4037:
URL: https://github.com/apache/iceberg/pull/4037#discussion_r810268713



##########
File path: 
core/src/test/java/org/apache/iceberg/rest/requests/TestCreateNamespaceRequest.java
##########
@@ -0,0 +1,129 @@
+/*
+ * 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.iceberg.rest.requests;
+
+import com.fasterxml.jackson.core.JsonProcessingException;
+import java.util.Map;
+import org.apache.iceberg.AssertHelpers;
+import org.apache.iceberg.catalog.Namespace;
+import org.apache.iceberg.relocated.com.google.common.collect.ImmutableMap;
+import org.apache.iceberg.rest.RequestResponseTestBase;
+import org.junit.Assert;
+import org.junit.Test;
+
+public class TestCreateNamespaceRequest extends 
RequestResponseTestBase<CreateNamespaceRequest> {
+
+  /* Values used to fill in request fields */
+  private static final Namespace NAMESPACE = Namespace.of("accounting", "tax");
+  private static final Map<String, String> PROPERTIES = 
ImmutableMap.of("owner", "Hank");
+  private static final Map<String, String> EMPTY_PROPERTIES = 
ImmutableMap.of();
+
+  @Test
+  // Test cases that are JSON that can be created via the Builder
+  public void testRoundTripSerDe() throws JsonProcessingException {
+    String fullJson = 
"{\"namespace\":[\"accounting\",\"tax\"],\"properties\":{\"owner\":\"Hank\"}}";
+    CreateNamespaceRequest req = CreateNamespaceRequest.builder()
+        .withNamespace(NAMESPACE).setProperties(PROPERTIES).build();
+    assertRoundTripSerializesEquallyFrom(fullJson, req);
+
+    String jsonEmptyProperties = 
"{\"namespace\":[\"accounting\",\"tax\"],\"properties\":{}}";
+    CreateNamespaceRequest reqWithExplicitEmptyProperties = 
CreateNamespaceRequest.builder()
+        .withNamespace(NAMESPACE).setProperties(EMPTY_PROPERTIES).build();
+    assertRoundTripSerializesEquallyFrom(jsonEmptyProperties, 
reqWithExplicitEmptyProperties);
+
+    CreateNamespaceRequest reqWithImplicitEmptyProperties = 
CreateNamespaceRequest.builder()
+        .withNamespace(NAMESPACE).build();
+    assertRoundTripSerializesEquallyFrom(jsonEmptyProperties, 
reqWithImplicitEmptyProperties);
+  }
+
+  @Test
+  // Test cases that can't be constructed with our Builder class but that will 
parse correctly
+  public void testCanDeserializeWithoutDefaultValues() throws 
JsonProcessingException {
+    CreateNamespaceRequest req = 
CreateNamespaceRequest.builder().withNamespace(NAMESPACE).build();
+    String jsonWithNullProperties = 
"{\"namespace\":[\"accounting\",\"tax\"],\"properties\":null}";
+    assertEquals(deserialize(jsonWithNullProperties), req);
+
+    String jsonWithMissingProperties = 
"{\"namespace\":[\"accounting\",\"tax\"]}";
+    assertEquals(deserialize(jsonWithMissingProperties), req);
+  }
+
+  @Test
+  public void testDeserializeInvalidRequest() {
+    String jsonIncorrectTypeForNamespace = 
"{\"namespace\":\"accounting%00tax\",\"properties\":null}";
+    AssertHelpers.assertThrows(
+        "A JSON request with incorrect types for fields should fail to 
deserialize and validate",
+        JsonProcessingException.class,
+        "Cannot parse string array from non-array value",
+        () -> deserialize(jsonIncorrectTypeForNamespace).validate()
+    );
+
+    String jsonIncorrectTypeForProperties = 
"{\"namespace\":[\"accounting\",\"tax\"],\"properties\":[]}";
+    AssertHelpers.assertThrows(
+        "A JSON request with incorrect types for fields should fail to parse 
and validate",
+        JsonProcessingException.class,
+        () -> deserialize(jsonIncorrectTypeForProperties).validate()
+    );
+
+    String jsonMisspelledKeys = 
"{\"namepsace\":[\"accounting\",\"tax\"],\"propertiezzzz\":{\"owner\":\"Hank\"}}";
+    AssertHelpers.assertThrows(
+        "A JSON request with the keys spelled incorrectly should fail to 
deserialize and validate",
+        JsonProcessingException.class,
+        () -> deserialize(jsonMisspelledKeys).validate()

Review comment:
       I've added in error message validation. But I didn't put it in some 
places where the error message comes form Jackson. I can do so if you'd like.




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