ismailsimsek commented on code in PR #8340:
URL: https://github.com/apache/iceberg/pull/8340#discussion_r1371566535


##########
core/src/test/java/org/apache/iceberg/jdbc/TestJdbcCatalog.java:
##########
@@ -604,6 +604,27 @@ public void testCreateNamespace() {
     // Test with no metadata
     catalog.createNamespace(testNamespace);
     assertThat(catalog.namespaceExists(testNamespace)).isTrue();
+    assertThat(catalog.namespaceExists(Namespace.of("testDb"))).isTrue();
+    assertThat(catalog.namespaceExists(Namespace.of("testDb", 
"ns1"))).isTrue();
+    assertThat(catalog.namespaceExists(Namespace.of("testDb", "ns1", 
"ns2"))).isTrue();
+    assertThat(catalog.namespaceExists(Namespace.of("testDb_"))).isFalse();
+    assertThat(catalog.namespaceExists(Namespace.of("testD_"))).isFalse();
+    assertThat(catalog.namespaceExists(Namespace.of("testDb."))).isFalse();
+    assertThat(catalog.namespaceExists(Namespace.of("testDb.ns"))).isFalse();
+    assertThat(catalog.namespaceExists(Namespace.of("testDb.ns_"))).isFalse();
+    assertThat(catalog.namespaceExists(Namespace.of("testDb%"))).isFalse();
+
+    Namespace underscore = Namespace.of("te%t_b");
+    assertThat(catalog.namespaceExists(underscore))
+        .as("Should false to namespace doesn't exist")
+        .isFalse();
+
+    Namespace underscore2 = Namespace.of("special_name%space");
+    catalog.createNamespace(underscore2);
+    assertThat(catalog.namespaceExists(underscore2)).isTrue();
+    assertThat(catalog.namespaceExists(Namespace.of("special_name%spa_e")))

Review Comment:
   re organized tests, spitted tests per special character



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