@Test
public void proximityShouldBeEqualToImmediateAndNear() {

  // given
  Beacon beacon = Mockito.mock(Beacon.class);
  // when
  when(beacon.getProximity()).then(new Answer<Proximity>() {
    @Override
    public Proximity answer(InvocationOnMock invocationOnMock) throws Throwable {
      return Proximity.NEAR;
    }
  });
  Function<Beacon, Boolean> filter =
      Filter.proximityIsEqualTo(Proximity.IMMEDIATE, Proximity.NEAR);
  Boolean call = apply(filter, beacon);
  // then
  assertThat(call).isTrue();
}