@Override
  protected Object callWithoutArg(String methodName) {
    if (NEXT_UNIQUE_ID.equals(methodName)) {
      return nextUniqueId();
    } else if (GET_EXEC_ENVIRONMENT.equals(methodName)) {
      return env;
    }
    throw new UnsupportedOperationException(
        "MaestroParamExtension DO NOT support calling method: " + methodName);
  }
@Test
  public void testGetExecutionEnvironment() {
    assertEquals("prod", paramExtension.callWithoutArg("getExecutionEnvironment"));
  }