def test_sorts_same_char(self):
test1 = lex_sort(["a", "aaa","", "aa"], "a")
self.assertEqual(len(test1), 4)
self.assertEqual(test1[0], "")
self.assertEqual(test1[1], "a")
self.assertEqual(test1[2], "aa")
self.assertEqual(test1[3], "aaa")
def test_returns_all_items(self):
test1 = lex_sort(['abc','def'], 'abcdef')
self.assertEqual(len(test1), 2)
self.assertTrue('abc' in test1)
self.assertTrue('def' in test1)
def test_sorts_equal(self):
test1 = lex_sort(["acb", "abc", "bca"], "abc")
self.assertEqual(len(test1), 3)
self.assertEqual(test1[0], "abc")
self.assertEqual(test1[1], "acb")
self.assertEqual(test1[2], "bca")