@Test
public void test_areSecretKeysValid()  {

    String jsonStr = "{\"data\": {\"key1\": \"value1\"}}";
    ReflectionTestUtils.setField(ControllerUtil.class, "secretKeyAllowedCharacters", "[a-z0-9_-]+");
    boolean valid = ControllerUtil.areSecretKeysValid(jsonStr);
    assertTrue(valid);
}