@Test
public final void testReadFileShouldReturnNullWhenRequestedFileDoesNotExist() {

    // GIVEN
    given(path.resolve(FILE_NAME)).willReturn(messageFilePath);
    given(messageFilePath.toFile()).willReturn(messageFile);
    given(messageFile.isFile()).willReturn(true);
    given(messageFile.exists()).willReturn(false);
    // WHEN
    InputStream actual = underTest.readFile(FILE_NAME, path);
    // THEN
    assertNull(actual);
}