rdblue commented on code in PR #8340:
URL: https://github.com/apache/iceberg/pull/8340#discussion_r1375317591


##########
core/src/test/java/org/apache/iceberg/jdbc/TestJdbcCatalog.java:
##########
@@ -601,15 +601,81 @@ public void testDropNamespace() {
   public void testCreateNamespace() {
     Namespace testNamespace = Namespace.of("testDb", "ns1", "ns2");
     assertThat(catalog.namespaceExists(testNamespace)).isFalse();
-    // Test with no metadata
+    assertThat(catalog.namespaceExists(Namespace.of("testDb", 
"ns1"))).isFalse();
     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("ns1", "ns2"))).isFalse();
+    assertThat(catalog.namespaceExists(Namespace.of("testDb", 
"ns%"))).isFalse();
+    assertThat(catalog.namespaceExists(Namespace.of("testDb", 
"ns_"))).isFalse();
+    assertThat(catalog.namespaceExists(Namespace.of("testDb", "ns1", 
"ns2"))).isTrue();
+    assertThat(catalog.namespaceExists(Namespace.of("testDb", "ns1", "ns2", 
"ns3"))).isFalse();
+  }
+
+  @Test
+  public void testCreateNamespaceWithBackslashCharacter() {
+
+    Namespace testNamespace = Namespace.of("test\\Db", "ns\\1", "ns3");

Review Comment:
   I think this needs to test cases where `\%` is used right?



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