def test_with_region_of_one_colour_should_make_empty_list():
"""Given a region with only 1 colour, only an empty list should be produced - no boundaries"""
region = mock.Mock(size=(1, 1))
image = mock.Mock(size=(2, 2))
image.crop.return_value = region
image.getextrema.return_value = (1, 1)
region.getextrema = image.getextrema
assert convert_region(image, 2) == []
def test_single_pixel_region_should_make_empty_list():
"""Test with a single pixel region.
The result should be a single empty list"""
image = mock.Mock(size=(1, 1))
assert convert_region(image, 2) == []