@Test
public void testGetExistingFilesListListOfFile()
{

    assertThat( PathUtil.existingFilesList( (List<File>) null ), nullValue() );
    assertThat( PathUtil.existingFilesList( Collections.singletonList( f5 ) ), hasItem( f5 ) );
    assertThat( PathUtil.existingFilesList( Arrays.asList( f2, f4, f5 ) ), hasItem( f5 ) );
}