def test_give_item_and_change(self):
item, change, _ = give_item_and_change('coke', "1.0")
self.assertEqual(item, 'coke')
self.assertEqual(change, [.20, .05, .02])
item, change, _ = give_item_and_change('biscuits', "1.5")
self.assertEqual(item, 'biscuits')
self.assertEqual(change, [.20, .10, .05])
item, change, _ = give_item_and_change('apple', ".65")
self.assertEqual(item, 'apple')
self.assertEqual(change, [.20, .02])
item, change, _ = give_item_and_change('apple', ".65 1.0")
self.assertEqual(item, 'apple')
self.assertEqual(change, [1.0, .20, .02])
def test_unavailable_item(self):
"""if user asks for an item that's unavailable, they should not be given the item, and their money should be returned"""
item, change, _ = give_item_and_change('crisps', .50)
self.assertIsNone(item)
self.assertEqual(change, None)