'Fail if the mock tracker matches the specified output.
Fail the test if `want` matches the output tracked by
`tracker` (defaults to ``self.mock_tracker``. This is not
an equality check, but a pattern match according to the
``minimock.MinimockOutputChecker`` rules.'

def failIfMockCheckerMatch(self, want, tracker=None, msg=None):

    if (tracker is None):
        tracker = self.mock_tracker
    if tracker.check(want):
        if (msg is None):
            diff = tracker.diff(want)
            msg = ('\n'.join(['Output    received    matched    specified    undesired    output', '%(diff)s']) % vars())
        raise self.failureException(msg)
