def test_unspecified_new_dimensions(self):
original_width, original_height = (800, 600)
new_width, new_height = (None, None)
rescaled_width, rescaled_height, top_margin, bottom_margin, left_margin, right_margin = \
rescale_and_keep_aspect_ratio(original_width, original_height, new_width, new_height)
self.assertEqual(800, rescaled_width)
self.assertEqual(600, rescaled_height)
self.assertEqual(0, top_margin)
self.assertEqual(0, bottom_margin)
self.assertEqual(0, left_margin)
self.assertEqual(0, right_margin)
def test_taller_aspect_ratio(self):
original_width, original_height = (800, 600)
new_width, new_height = (800, 800)
rescaled_width, rescaled_height, top_margin, bottom_margin, left_margin, right_margin = \
rescale_and_keep_aspect_ratio(original_width, original_height, new_width, new_height)
self.assertEqual(800, rescaled_width)
self.assertEqual(600, rescaled_height)
self.assertEqual(100, top_margin)
self.assertEqual(100, bottom_margin)
self.assertEqual(0, left_margin)
self.assertEqual(0, right_margin)
def test_zero_dimensions(self):
original_width, original_height = (800, 600)
new_width, new_height = (0, 600)
with self.assertRaises(ValueError):
rescale_and_keep_aspect_ratio(
original_width,
original_height,
new_width,
new_height,
)
new_width, new_height = (800, 0)
with self.assertRaises(ValueError):
rescale_and_keep_aspect_ratio(
original_width,
original_height,
new_width,
new_height,
)
original_width, original_height = (0, 600)
new_width, new_height = (800, 600)
with self.assertRaises(ValueError):
rescale_and_keep_aspect_ratio(
original_width,
original_height,
new_width,
new_height,
)
original_width, original_height = (800, 0)
with self.assertRaises(ValueError):
rescale_and_keep_aspect_ratio(
original_width,
original_height,
new_width,
new_height,
)