37   def setUp(self):  argument
38     self.pin = m.Gpio(MRAA_GPIO)
39     self.gpio_path = "/sys/class/gpio/gpio" + str(self.pin.getPin(True))
41   def tearDown(self):  argument
43     self.pin = ""
45   def test_returning_pin_no(self):  argument
46     self.pin_no = self.pin.getPin() # i should have the pin no. here as set when initing Gpio class
47 …self.assertEqual(self.pin_no, MRAA_GPIO, "Something wrong happened ... set pin doesn't correspond …
49   def test_returning_pin_as_on_sys(self):  argument
50     self.assertTrue(os.path.exists(self.gpio_path))
52   def test_set_GPIO_as_output(self):  argument
53     self.pin.dir(m.DIR_OUT)
54     dir_file = open(self.gpio_path + "/direction")
57     self.assertMultiLineEqual(dir_file_content, "out")
59   def test_set_GPIO_as_input(self):  argument
60     self.pin.dir(m.DIR_IN)
61     dir_file = open(self.gpio_path + "/direction")
64     self.assertMultiLineEqual(dir_file_content, "in")
66   def test_GPIO_as_output_write_HIGH_level(self):  argument
67     self.pin.dir(m.DIR_OUT)
68     self.pin.write(1)
69     val_file = open(self.gpio_path + "/value")
72     self.assertEqual(int(sysfs_pin_value),1, "Value doesn't match the HIGH state")
74   def test_GPIO_as_output_write_LOW_level(self):  argument
75     self.pin.dir(m.DIR_OUT)
76     self.pin.write(0)
77     val_file = open(self.gpio_path + "/value")
80     self.assertEqual(int(sysfs_pin_value), 0, "Value doesn't match the LOW state")
82   def test_GPIO_as_input_and_write_HIGH_on_it(self):  argument
83     self.pin.dir(m.DIR_IN)
84     res = self.pin.write(1)
85     self.assertNotEqual(res, m.SUCCESS, "The command should fail")
87   def test_GPIO_as_input_and_write_LOW_on_it(self):  argument
88     self.pin.dir(m.DIR_IN)
89     res = self.pin.write(0)
90     self.assertGreater(res, 0, "The command should have returned value greater than 0")