@property
    def MfSigma(self):
        if getattr(self, '_MfSigma', None) is None:
            self._MfSigma = self.mesh.getFaceInnerProduct(self.curModel.sigma)
        return self._MfSigma
Tests  the corner case occurs when the send_always setting is True
dataset/ETHPy150Open simpeg/simpeg/SimPEG/MT/Problem1D/Probs.py/eForm_psField.MfSigma--crossover with--dataset/ETHPy150Open corydolphin/flask-cors/tests/decorator/test_origins.py/OriginsTestCase.test_regex_mixed_list