def test_rgb_im_not_none_and_image_none():
# this is the case where the image has been set previously
# and has now been unset
im = MyImage()
im.image = Mock()
im.rgb_im
im.image=None
with assert_raises(NoImageLoadedError):
im.rgb_im
def test_rgb_im_None_and_image_not_none():
im = MyImage()
im.image = Mock()
assert_true(im._rgb_im is None)
im.rgb_im
assert_true(im._rgb_im is not None)
assert_true(im.image.convert.called)
def test_rgb_im_not_none_and_image_not_none():
# this is the case where the image has been set previously
# and has now been unset
im = MyImage()
im.image = Mock()
im.rgb_im
assert_equal(im.image.convert.call_count, 1)
im.rgb_im
# call count hasn't changed
assert_equal(im.image.convert.call_count, 1)