def test_passthrough(self):
        obj = object()
        self.assertIs(obj, _passthrough(obj))
.. todo::
dataset/ETHPy150Open ClusterHQ/eliot/eliot/tests/test_twisted.py/PassthroughTests.test_passthrough--crossover with--dataset/ETHPy150Open lisa-lab/pylearn2/pylearn2/models/pca.py/SparseMatPCA.get_input_type