def test_abbreviations(self):
extra_small = helpers.sizes('extra small')
self.assertEqual(extra_small, 'xs')
xxl = helpers.sizes('xx-large')
self.assertEqual(xxl, 'xxl')
def test_lowercase_conversion(self):
small = helpers.sizes('s')
self.assertEqual(small, 's')
medium = helpers.sizes('M')
self.assertEqual(medium, 'm')
