@Test
public void toJsonWithInitialPolicyReturnsExpected() {

    final JsonObject expected = KNOWN_JSON.set(ModifyThing.JSON_INITIAL_POLICY, JsonObject.newBuilder().build());
    final ModifyThing underTest =
            ModifyThing.of(TestConstants.Thing.THING_ID, TestConstants.Thing.THING, JsonObject.newBuilder().build(),
                    TestConstants.EMPTY_DITTO_HEADERS);
    final JsonObject actualJson = underTest.toJson(FieldType.regularOrSpecial());
    assertThat(actualJson).isEqualTo(expected);
}