@Test
public void toStringOfExistsTypeFilterReturnsExpectedRepresentation() {

    final ImmutablePropertyFilter underTest =
            ImmutablePropertyFilter.of(SearchFilter.Type.EXISTS, THING_ID_PATH, Collections.emptySet());
    assertThat(underTest)
            .hasStringRepresentation(
                    "exists(" + THING_ID_PATH + ")");
}