nastra commented on code in PR #9782:
URL: https://github.com/apache/iceberg/pull/9782#discussion_r1566939429


##########
core/src/test/java/org/apache/iceberg/rest/TestRESTCatalog.java:
##########
@@ -2329,6 +2374,57 @@ public void 
multipleDiffsAgainstMultipleTablesLastFails() {
     assertThat(schema2.columns()).hasSize(1);
   }
 
+  @Test
+  public void testInvalidRestPageSize() {
+    RESTCatalogAdapter adapter = Mockito.spy(new 
RESTCatalogAdapter(backendCatalog));
+    RESTCatalog catalog =
+            new RESTCatalog(SessionCatalog.SessionContext.createEmpty(), 
(config) -> adapter);
+    org.assertj.core.api.Assertions.assertThatThrownBy(
+            () -> catalog.initialize("test", 
ImmutableMap.of(RESTSessionCatalog.REST_PAGE_SIZE, "-1")))
+            .isInstanceOf(IllegalArgumentException.class)
+            .hasMessage("Invalid value for pageSize, must be a positive 
integer");
+  }
+
+  @Test
+  public void testPaginationForListNamespaces() {
+    RESTCatalogAdapter adapter = Mockito.spy(new 
RESTCatalogAdapter(backendCatalog));

Review Comment:
   no need for `Mockito.spy()` here as you're not doing any verifications on 
the `adapter` in this test (and in the other tests)



##########
core/src/test/java/org/apache/iceberg/rest/TestRESTCatalog.java:
##########
@@ -2329,6 +2374,57 @@ public void 
multipleDiffsAgainstMultipleTablesLastFails() {
     assertThat(schema2.columns()).hasSize(1);
   }
 
+  @Test
+  public void testInvalidRestPageSize() {
+    RESTCatalogAdapter adapter = Mockito.spy(new 
RESTCatalogAdapter(backendCatalog));
+    RESTCatalog catalog =
+            new RESTCatalog(SessionCatalog.SessionContext.createEmpty(), 
(config) -> adapter);
+    org.assertj.core.api.Assertions.assertThatThrownBy(
+            () -> catalog.initialize("test", 
ImmutableMap.of(RESTSessionCatalog.REST_PAGE_SIZE, "-1")))
+            .isInstanceOf(IllegalArgumentException.class)
+            .hasMessage("Invalid value for pageSize, must be a positive 
integer");
+  }
+
+  @Test
+  public void testPaginationForListNamespaces() {
+    RESTCatalogAdapter adapter = Mockito.spy(new 
RESTCatalogAdapter(backendCatalog));
+    RESTCatalog catalog =
+        new RESTCatalog(SessionCatalog.SessionContext.createEmpty(), (config) 
-> adapter);
+    catalog.initialize("test", 
ImmutableMap.of(RESTSessionCatalog.REST_PAGE_SIZE, "10"));
+    int numberOfItems = 100;
+    String namespaceName = "newdb";
+
+    // create several namespaces for listing and verify
+    for (int i = 0; i < numberOfItems; i++) {
+      String nameSpaceName = namespaceName + i;
+      catalog.createNamespace(Namespace.of(nameSpaceName));
+    }
+
+    List<Namespace> results = catalog.listNamespaces();
+    assertThat(results).hasSize(numberOfItems);
+  }
+
+  @Test
+  public void testPaginationForListTables() {
+    RESTCatalogAdapter adapter = Mockito.spy(new 
RESTCatalogAdapter(backendCatalog));

Review Comment:
   same as above



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