gistfile1.py

def setUp(self):
        self.mybag = Bag(['d','a','b','d','c','b','d'])

    def test_len(self):
        self.assertEqual(len(self.mybag), 7)
        
        for removal in ['d','a','b','d','c','b','d']:
            baglen = len(self.mybag)
            self.mybag.remove(removal)
            self.assertEqual(baglen - 1, len(self.mybag))
        self.assertEqual(0, len(self.mybag))