Method repr_failure

src/_pytest/doctest.py:310–372

(  # type: ignore[override]
        self,
        excinfo: ExceptionInfo[BaseException],
    )

    # TODO: Type ignored -- breaks Liskov Substitution.
    def repr_failure(  # type: ignore[override]
        self,
        excinfo: ExceptionInfo[BaseException],
    ) -> Union[str, TerminalRepr]:
        import doctest

        failures: Optional[
            Sequence[Union[doctest.DocTestFailure, doctest.UnexpectedException]]
        ] = None
        if isinstance(
            excinfo.value, (doctest.DocTestFailure, doctest.UnexpectedException)
        ):
            failures = [excinfo.value]
        elif isinstance(excinfo.value, MultipleDoctestFailures):
            failures = excinfo.value.failures

        if failures is None:
            return super().repr_failure(excinfo)

        reprlocation_lines = []
        for failure in failures:
            example = failure.example
            test = failure.test
            filename = test.filename
            if test.lineno is None:
                lineno = None
            else:
                lineno = test.lineno + example.lineno + 1
            message = type(failure).__name__
            # TODO: ReprFileLocation doesn't expect a None lineno.
            reprlocation = ReprFileLocation(filename, lineno, message)  # type: ignore[arg-type]
            checker = _get_checker()
            report_choice = _get_report_choice(self.config.getoption("doctestreport"))
            if lineno is not None:
                assert failure.test.docstring is not None
                lines = failure.test.docstring.splitlines(False)
                # add line numbers to the left of the error message
                assert test.lineno is not None
                lines = [
                    "%03d %s" % (i + test.lineno + 1, x) for (i, x) in enumerate(lines)
                ]
                # trim docstring error lines to 10
                lines = lines[max(example.lineno - 9, 0) : example.lineno + 1]
            else:
                lines = [
                    "EXAMPLE LOCATION UNKNOWN, not showing all tests of that example"
                ]
                indent = ">>>"
                for line in example.source.splitlines():
                    lines.append(f"??? {indent} {line}")
                    indent = "..."
            if isinstance(failure, doctest.DocTestFailure):
                lines += checker.output_difference(
                    example, failure.got, report_choice
                ).split("\n")
            else:
                inner_excinfo = ExceptionInfo.from_exc_info(failure.exc_info)
                lines += ["UNEXPECTED EXCEPTION: %s" % repr(inner_excinfo.value)]