@Test
public void toJsonReturnsExpected() {

    final RetrieveResources underTest = RetrieveResources.of(
            TestConstants.Policy.POLICY_ID, TestConstants.Policy.LABEL, EMPTY_DITTO_HEADERS);
    final JsonObject actualJson = underTest.toJson(FieldType.regularOrSpecial());
    assertThat(actualJson).isEqualTo(KNOWN_JSON);
}