def test_check_file_no_changes(capsys, tmpdir) -> None:
perfect = tmpdir.join("test_no_changes.py")
perfect.write_text("import a\nimport b\n", "utf8")
assert api.check_file(perfect, show_diff=True)
out, _ = capsys.readouterr()
assert not out
def test_check_file_with_changes(capsys, imperfect) -> None:
assert not api.check_file(imperfect, show_diff=True)
out, _ = capsys.readouterr()
assert fixed_diff.replace("\n", os.linesep) in out