runner.py 文件源码

def addFailure(self, test, err):
        """Called when an error has occurred. 'err' is a tuple of
        values as returned by sys.exc_info().
        """
        if err[0] == ValidationError:
            exctype, value, tb = err          # Unpack tuple.
            tb = HideInternalStackFrames(tb)  # Hide internal frames.
            value._verbose = self.showAll     # Set verbose flag (True/False).
            err = (exctype, value, tb)        # Repack tuple.

        if self._is_mandatory(test):
            err = self._add_mandatory_message(err)
            self.stop()  # <- sets "self.shouldStop = True

        TextTestResult.addFailure(self, test, err)