def test1(self): self.assertEqual(base_str(10,10), "10")
def test2(self): self.assertEqual(base_str(10,60), "a")
def test7(self): self.assertEqual(base_str(4,51), "4")
def test6(self): self.assertEqual(base_str(-1351), "-lN")
def test5(self): self.assertEqual(base_str(-1351,62), "-lN")
def test4(self): with self.assertRaises(ValueError): base_str(60,63)
def test3(self): self.assertEqual(base_str(1351,62), "lN")