def test_unpack_argb():
cardinal = Pixel(168, 0, 59, 0x41)
alpha, red, green, blue = cardinal.argb()
assert alpha == 0x41
assert red == 168
assert green == 0
assert blue == 59
def test_empty_pixel_is_black():
empty = Pixel()
assert empty.red == 0x00
assert empty.green == 0x00
assert empty.blue == 0x00
assert empty.alpha == 0xFF
def test_set_green_channel_repeatedly():
cardinal = Pixel(168, 0, 59)
for i in range(256):
assert cardinal.green == i
cardinal.green += 1
def test_unpack_rgb():
cardinal = Pixel(168, 0, 59)
red, green, blue = cardinal.rgb()
assert red == 168
assert green == 0
assert blue == 59
def test_set_red_channel():
cardinal = Pixel(168, 0, 59)
cardinal.red = 41
assert cardinal.red == 41
def test_make_color_with_only_some_channels_by_keyword():
cardinal = Pixel(blue=59, red=168)
assert cardinal.red == 168
assert cardinal.green == 0
assert cardinal.blue == 59
def test_make_color_with_only_some_channels():
pixel = Pixel(168, 41)
assert pixel.red == 168
assert pixel.green == 41
assert pixel.blue == 0
assert pixel.alpha == 0xFF
def test_make_color_with_alpha():
cardinal = Pixel(168, 0, 59, 0x7F)
assert cardinal.alpha == 0x7F
def test_make_color_by_positional_arguments():
cardinal = Pixel(168, 0, 59)
assert cardinal.red == 168
assert cardinal.green == 0
assert cardinal.blue == 59