def METHOD_NAME(self):
    self.generate_snap_pair()
    base_delta = deltas.XDelta3Generator(
        source_path=self.source_file, target_path=self.target_file
    )
    base_delta.make_delta(is_for_test=True)
    self.assertThat(
        self.fake_logger.output,
        m.Contains(
            "Generating delta for {!r}".format(
                os.path.basename(base_delta.target_path)
            )
        ),
    )
    self.assertThat(
        self.fake_logger.output, m.Contains("xdelta3 delta diff generation")
    )