def isFalse(self, expr):
        testval = self.session.run(expr)
        if isinstance(testval, np.ndarray):
            testval = np.all(testval)
        return self.assertFalse(testval)
L{getRepositoryCommand} from a Subversion checkout returns
dataset/ETHPy150Open xraypy/xraylarch/tests/utils.py/TestCase.isFalse--crossover with--dataset/ETHPy150Open twisted/twisted/twisted/python/test/test_release.py/RepositoryCommandDetectionTest.test_subversion