def test_crop_noise_returns_none():
loc = 'tests/data/noise.png'
noise = cv2.imread(loc)
assert crop(noise) is None
def test_obama_has_a_face():
loc = 'tests/data/obama.jpg'
obama = cv2.imread(loc)
assert len(crop(obama, 500, 500)) == 500
def test_size_changes_width_and_height():
loc = 'tests/data/obama.jpg'
obama = cv2.imread(loc)
assert len(crop(obama, None, None, 350)) == 350