def test_equals_2(self):
     self.assertEqual(array('1,2,3,4'), '2 3')
 def test_equals(self):
     self.assertEqual(array('1,2,3'), '2')
 def test_none_2(self):
     self.assertIsNone(array('1'))
 def test_none_3(self):
     self.assertIsNone(array('1, 3'))
 def test_none(self):
     self.assertIsNone(array(''))