@Test
public void toJsonReturnsExpected() {

    final PolicyCreated underTest = PolicyCreated.of(TestConstants.Policy.POLICY,
            TestConstants.Policy.REVISION_NUMBER, TestConstants.TIMESTAMP, TestConstants.EMPTY_DITTO_HEADERS);
    final JsonObject actualJson = underTest.toJson(FieldType.regularOrSpecial());
    assertThat(actualJson).isEqualTo(KNOWN_JSON);
}