def test_usblight_create_fails():
"""USBLight is an abstract base class which may not be
instantiated directly.
"""
with pytest.raises(TypeError, match="abstract methods"):
u = USBLight(0, 0, b"path", False)
def test_usblight_first_light():
"""The first_light() classmethod returns a configured
light or raises USBLightNotFound when no more lights
can be located.
"""
with pytest.raises(USBLightNotFound):
lights = []
while True:
lights.append(USBLight.first_light())
def test_supported_lights():
"""The supported_lights() classmethod returns a list of
USBLight concrete subclasses.
"""
supported_lights = USBLight.supported_lights()
assert isinstance(supported_lights, list)
for light in supported_lights:
assert issubclass(light, USBLight)
def test_usblight_first_light():
"""The first_light() classmethod returns a configured
light or raises USBLightNotFound when no more lights
can be located.
For this test, we keep references to each light in a
list to keep them from being released and re-found by
the `first_light` method.
"""
with pytest.raises(USBLightNotFound):
lights = []
while True:
lights.append(USBLight.first_light())
def supported_lights() -> list:
"""A list of supported USBLight subclasses."""
return USBLight.supported_lights()
def test_usblight_all_lights():
result = USBLight.all_lights()
assert isinstance(result, list)