def test_read_return_value(self, mock_check_output):
mock_check_output.return_value = "1\n"
result = read(pin=1)
self.assertEqual(result, 1, 'Result should be int(1).')
def test_read_wrong_pin(self, mock_check_output):
with self.assertRaises(WrongPinNumber):
read(pin=26)
self.assertFalse(mock_check_output.called, "check_output shouldn't be called.")
def test_read_check_output(self, mock_check_output):
read(pin=1)
mock_check_output.assert_called_with('gpio -g read 1', shell=True)