def test_seting_proportions_validates_them(self):
some_proportions = (0, .1, .2, .3)
other_proportions = (.4, .5, .6, .7)
pr = ProportionalRegion(some_proportions)
with patch.object(visuals, '_validate_proportions') as m_validate:
pr.proportions = other_proportions
self.assertIsNone(m_validate.assert_called_with(other_proportions))
def test_region_in_returns_correct_borders(self):
# create an image to work with
h, w = 100, 200
image = _generic_image(height=h, width=w)
# specify the correct values for a given proportion set
top_proportion, left_proportion, bottom_proportion, right_proportion =\
proportions =\
_generic_proportions()
top_spec = int(round(h * top_proportion))
left_spec = int(round(w * left_proportion))
bottom_spec = int(round(h * bottom_proportion))
right_spec = int(round(w * right_proportion))
border_pixels_spec = top_spec, left_spec, bottom_spec, right_spec
# confirm the calculation
pr = ProportionalRegion(proportions)
border_pixels = pr.region_in(image)
self.assertEqual(border_pixels, border_pixels_spec)