Add servo tests.

tests/test_arduino.py

@@ -190,5 +190,71 @@ class TestArduino(ArduinoTestCase):
             build_cmd_str('aw', (pin, value)))
 
 
+class TestServos(ArduinoTestCase):
+
+    def test_attach(self):
+        from Arduino.arduino import build_cmd_str
+        pin = 10
+        position = 0
+        self.mock_serial.push_line(position)
+        servo_min = 544
+        servo_max = 2400
+        self.board.Servos.attach(pin, min=servo_min, max=servo_max)
+        self.assertEquals(self.mock_serial.output[0],
+            build_cmd_str('sva', (pin, servo_min, servo_max)))
+
+    def test_detach(self):
+        from Arduino.arduino import build_cmd_str
+        pin = 10
+        position = 0
+        # Attach first.
+        self.mock_serial.push_line(position)
+        self.board.Servos.attach(pin)
+        self.mock_serial.reset_mock()
+        self.board.Servos.detach(pin)
+        self.assertEquals(self.mock_serial.output[0],
+            build_cmd_str('svd', (position,)))
+
+    def test_write(self):
+        from Arduino.arduino import build_cmd_str
+        pin = 10
+        position = 0
+        angle = 90
+        # Attach first.
+        self.mock_serial.push_line(position)
+        self.board.Servos.attach(pin)
+        self.mock_serial.reset_mock()
+        self.board.Servos.write(pin, angle)
+        self.assertEquals(self.mock_serial.output[0],
+            build_cmd_str("svw", (position, angle)))
+
+    def test_writeMicroseconds(self):
+        from Arduino.arduino import build_cmd_str
+        pin = 10
+        position = 0
+        microseconds = 1500
+        # Attach first.
+        self.mock_serial.push_line(position)
+        self.board.Servos.attach(pin)
+        self.mock_serial.reset_mock()
+        self.board.Servos.writeMicroseconds(pin, microseconds)
+        self.assertEquals(self.mock_serial.output[0],
+            build_cmd_str("svwm", (position, microseconds)))
+
+    def test_read(self):
+        from Arduino.arduino import build_cmd_str
+        pin = 10
+        position = 0
+        angle = 90
+        # Attach first.
+        self.mock_serial.push_line(position)
+        self.board.Servos.attach(pin)
+        self.mock_serial.reset_mock()
+        self.mock_serial.push_line(angle)
+        self.assertEquals(self.board.Servos.read(pin), angle)
+        self.assertEquals(self.mock_serial.output[0],
+            build_cmd_str("svr", (position,)))
+
+
 if __name__ == '__main__':
     unittest.main()