@Test
public void testIsValidClusterNamespaceWithInCorrectInput() throws Exception {

  String someInvalidInput = "中文123";
  assertFalse(InputValidator.isValidClusterNamespace(someInvalidInput));
  String anotherInvalidInput = "123@#{}";
  assertFalse(InputValidator.isValidClusterNamespace(anotherInvalidInput));
}