@Test
public void testFilter_onePoint() {

    final List<SamplingPoint> sampleList = new ArrayList<>();
    addSamplePoint(19, 83, sampleList);
    final List<SamplingPoint> filteredList = filter.apply(sampleList);
    assertNotNull(filteredList);
    assertEquals(1, filteredList.size());
    assertSamplePointAt(19, 83, 0, filteredList);
}