def test_remove_quotes(self):
    self.assertEqual(remove_quotes(None), None)
    self.assertEqual(remove_quotes('"'), '"')
    self.assertEqual(remove_quotes("'"), "'")
    self.assertEqual(remove_quotes(';'), ';')
    self.assertEqual(remove_quotes('";'), '";')
    self.assertEqual(remove_quotes('""'), '')
    self.assertEqual(remove_quotes('";"'), ';')
def test_remove_quotes(self):
    self.assertEqual(remove_quotes(None), None)
    self.assertEqual(remove_quotes('"'), '"')
    self.assertEqual(remove_quotes("'"), "'")
    self.assertEqual(remove_quotes(';'), ';')
    self.assertEqual(remove_quotes('";'), '";')
    self.assertEqual(remove_quotes(''), )
    self.assertEqual(remove_quotes('";"'), ';')