@Test
  public void testProcessWithKerberos_UpdateKererosConfigProperty_WithCustomValueEqualToStackDefault() throws
    Exception {

    Capture<? extends Set<String>> captureUpdatedConfigTypes = testProcessWithKerberos("defaultTestValue",
      "defaultTestValue", null);

    Set<String> updatedConfigTypes = captureUpdatedConfigTypes.getValue();
    assertEquals(2, updatedConfigTypes.size());

  }
testConfigType config type should be in updatedConfigTypes, as testProperty in Blueprint is equal to stack
default ==> Kerberos config property should be updated
@throws Exception
ambari-server/src/test/java/org/apache/ambari/server/topology/ClusterConfigurationRequestTest.java