def test_isnone(self):
        self.assertTrue(cmd.isnone(None), "Test None")
        self.assertTrue(cmd.isnone('None'), "Test 'None'")

        self.assertFalse(cmd.isnone('Non'), "Test 'Non'")
        self.assertFalse(cmd.isnone(0), "Test zero")
        self.assertFalse(cmd.isnone(''), "Test empty string")
 def test_isnone(self):
     """Test isnone function."""
     self.assertTrue(isnone(None))
     self.assertTrue(isnone('None'))
     self.assertFalse(isnone(''))
 def test_isnone(self):
     """Test isnone function."""
     self.assertTrue(isnone(None))
     self.assertTrue(isnone('None'))
     self.assertFalse(isnone(''))