def test_unsupported_platform():
e = RuntimeError('Module not imported correctly!')
errorgpio = Mock(unsafe=True)
errorgpio.setup.side_effect = e
try:
backlit_device(serial_interface=noop(), gpio_LIGHT=19, gpio=errorgpio)
except luma.core.error.UnsupportedPlatform as ex:
assert str(ex) == 'GPIO access not available'
def test_pwm_unsupported_platform():
gpio_LIGHT = 18
e = RuntimeError('Module not imported correctly!')
gpio.PWM.side_effect = e
try:
backlit_device(serial_interface=noop(), gpio=gpio, gpio_LIGHT=gpio_LIGHT, pwm_frequency=100)
except luma.core.error.UnsupportedPlatform as ex:
assert str(ex) == 'GPIO access not available'
else:
pytest.fail("Didn't raise exception")
def test_active_low_enable_off():
gpio_LIGHT = 19
device = backlit_device(serial_interface=noop(),
gpio=gpio,
gpio_LIGHT=gpio_LIGHT)
gpio.reset_mock()
device.backlight(False)
gpio.output.assert_called_once_with(gpio_LIGHT, gpio.HIGH)
def test_cleanup():
gpio_LIGHT = 11
device = backlit_device(serial_interface=noop(),
gpio=gpio,
gpio_LIGHT=gpio_LIGHT)
gpio.reset_mock()
device.cleanup()
gpio.output.assert_called_once_with(gpio_LIGHT, gpio.HIGH)
def test_pwm_turn_on():
gpio_LIGHT = 18
pwm_mock = Mock()
gpio.PWM.return_value = pwm_mock
device = backlit_device(serial_interface=noop(), gpio=gpio, gpio_LIGHT=gpio_LIGHT, pwm_frequency=100)
gpio.PWM.assert_called_once_with(gpio_LIGHT, 100)
gpio.reset_mock()
device.backlight(True)
pwm_mock.ChangeDutyCycle.assert_called_once_with(100.0)
def test_pcf8574_cleanup():
"""
Cleanup of backlit device using a PCF8574 interface should not cleanup gpio
"""
gpio_LIGHT = 11
smbus = Mock(unsafe=True)
serial = pcf8574(bus=smbus, address=0x27)
gpio.reset_mock()
device = backlit_device(serial_interface=serial, gpio=gpio, gpio_LIGHT=gpio_LIGHT)
device.cleanup()
assert not gpio.cleanup.called, 'GPIO cleanup not necessary with _backlight_enabled interface'
def test_gpio_cleanup():
"""
Cleanup of backlit_device using a GPIO interface should turn light off and then
clean up the GPIO pin associated with the backlight
"""
gpio_LIGHT = 11
device = backlit_device(serial_interface=noop(), gpio=gpio, gpio_LIGHT=gpio_LIGHT)
gpio.reset_mock()
device.cleanup()
gpio.output.assert_called_once_with(gpio_LIGHT, gpio.HIGH)
gpio.cleanup.assert_called_once_with(gpio_LIGHT)
def test_pwm_cleanup():
"""
Cleanup of backlit_device using a GPIO PWM interface should turn light off,
shut off the PWM function and then clean up the GPIO pin associated with the
backlight
"""
gpio_LIGHT = 11
device = backlit_device(serial_interface=noop(), gpio=gpio, gpio_LIGHT=gpio_LIGHT,
pwm_frequency=362)
gpio.reset_mock()
device.cleanup()
assert device.backlight._pwm.stop.called, \
'PWM stop method should be called during cleanup'
gpio.cleanup.assert_called_once_with(gpio_LIGHT)
def test_init():
gpio_LIGHT = 11
backlit_device(serial_interface=noop(), gpio=gpio, gpio_LIGHT=gpio_LIGHT)
gpio.setup.assert_called_once_with(gpio_LIGHT, gpio.OUT)
gpio.output.assert_called_once_with(gpio_LIGHT, gpio.LOW)
