@Test
void testMap() throws IOException {

	MappedByteBuffer mockMappedByteBuffer = mock(MappedByteBuffer.class);
	when(fc.map(any(MapMode.class), anyLong(), anyLong())).thenReturn(mockMappedByteBuffer);
	assertThat(hdfFc.map(20, 10), is(sameInstance(mockMappedByteBuffer)));
}