def test_subtract_inplace(self):
"""Test inplace subtract method."""
chan = UnitaryChannel([[1, 2], [3, 4]])
chan.subtract(chan, inplace=True)
self.assertEqual(chan, UnitaryChannel(np.zeros((2, 2))))
chan = UnitaryChannel([[1, 2], [3, 4]])
chan -= chan
self.assertEqual(chan, UnitaryChannel(np.zeros((2, 2))))
def test_subtract(self):
"""Test subtract method."""
chan = UnitaryChannel([[1, 2], [3, 4]])
self.assertEqual(chan.subtract(chan), UnitaryChannel(np.zeros((2, 2))))
self.assertEqual(chan - chan, UnitaryChannel(np.zeros((2, 2))))
