def METHOD_NAME(self) -> None:
    # Comparing the "good" result without scrubbing the variable parts will fail.
    self.make_file("out/gettysburg.txt", GOOD_GETTY)
    # compare() raises an assertion.
    msg = rf"Files differ: .*{GOLD_PATH_RX} != {OUT_PATH_RX}"
    with pytest.raises(AssertionError, match=msg):
        compare(gold_path("testing/getty"), "out")
    stdout = self.stdout()
    assert "- 11/19/1863, Gettysburg, Pennsylvania" in stdout
    assert "+ 11/19/9999, Gettysburg, Pennsylvania" in stdout