Method _prunetraceback

src/_pytest/unittest.py:322–330

(
        self, excinfo: _pytest._code.ExceptionInfo[BaseException]
    )

                delattr(self._testcase, self.name)

    def _prunetraceback(
        self, excinfo: _pytest._code.ExceptionInfo[BaseException]
    ) -> None:
        super()._prunetraceback(excinfo)
        traceback = excinfo.traceback.filter(
            lambda x: not x.frame.f_globals.get("__unittest")
        )
        if traceback:
            excinfo.traceback = traceback


@hookimpl(tryfirst=True)