@Test
public void testGetRelevantNwpDirs_threeMeasurements_onlyFillValue() throws IOException {

    when(array.getSize()).thenReturn(3L);
    when(array.getInt(0)).thenReturn(Integer.MIN_VALUE);
    when(array.getInt(1)).thenReturn(Integer.MIN_VALUE);
    when(array.getInt(2)).thenReturn(Integer.MIN_VALUE);
    final List<String> relevantNwpDirs = NwpUtil.getRelevantNwpDirs(variable, null);
    assertNotNull(relevantNwpDirs);
    assertEquals(0, relevantNwpDirs.size());
}