@Test
public void addFieldSelector() {

    final String pointerCString = "/c";
    final JsonPointer pointerC = JsonFactory.newPointer(pointerCString);
    underTest.addPointerString(pointerCString);
    underTest.addFieldSelector(ImmutableJsonFieldSelector.of(Arrays.asList(pointerA, pointerB)));
    final JsonFieldSelector actual = underTest.build();
    assertThat(actual).containsExactly(pointerC, pointerA, pointerB);
}