def METHOD_NAME(self) -> None:
    """Test if the returned JSON is a valid codeclimate report (containing 'positions' instead of 'lines')."""
    assert isinstance(self.formatter, CodeclimateJSONFormatter)
    result = json.loads(
        self.formatter.format_result(
            [
                MatchError(
                    message="message",
                    lineno=1,
                    column=42,
                    details="hello",
                    lintable=Lintable("filename.yml", content=""),
                    rule=self.rule,
                ),
            ],
        ),
    )
    assert result[0]["location"]["positions"]["begin"]["line"] == 1
    assert result[0]["location"]["positions"]["begin"]["column"] == 42
    assert "lines" not in result[0]["location"]