@Test
public void toJsonReturnsExpected() {

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