def test_remove_start(self):
    self.assertEqual(remove_start(None, 'A - '), None)
    self.assertEqual(remove_start('A - B', 'A - '), 'B')
    self.assertEqual(remove_start('B - A', 'A - '), 'B - A')
def test_remove_start(self):
    self.assertEqual(remove_start(None, 'A - '), None)
    self.assertEqual(remove_start('A - B', 'A - '), 'B')
    self.assertEqual(remove_start('B - A', 'A - '), 'B - A')