def getTestCaseNames(self, testCaseClass):
        """Return a sorted sequence of method names found within testCaseClass
        """
        testFnNames = filter(lambda n,p=self.testMethodPrefix: n[:len(p)] == p,
                             dir(testCaseClass))
        for baseclass in testCaseClass.__bases__:
            for testFnName in self.getTestCaseNames(baseclass):
                if testFnNames not in testFnName:  # handle overridden methods
                    testFnNames.append(testFnName)
        if self.sortTestMethodsUsing:
            testFnNames.sort(self.sortTestMethodsUsing)
        return testFnNames
dataset/ETHPy150Open garethr/django-test-extensions/src/test_extensions/testrunners/xmlunit/unittest.py/TestLoader.getTestCaseNames/swapped operands of `not in`