def METHOD_NAME(rule_runner: RuleRunner, preamble: str, content: str) -> None:
    files = {
        "foo.py": content,
    }
    rule_runner.write_files(files)
    fmt_result = run_preamble(rule_runner, {"*": preamble})
    assert fmt_result.output == rule_runner.make_snapshot(files)
    assert fmt_result.did_change is False