@Test
public void tryToCreateInstanceWithNullFallBackValues() {

    final Config config = ConfigFactory.parseMap(Collections.singletonMap(KNOWN_CONFIG_PATH, "nothing"));
    assertThatExceptionOfType(DittoConfigError.class)
            .isThrownBy(() -> ConfigWithFallback.newInstance(config, KNOWN_CONFIG_PATH, null))
            .withCause(new NullPointerException("The fall-back values must not be null!"));
}