+
+class ReadOnlyDictViewTest(unittest.TestCase):
+
+ def setUp(self):
+ self.sample = dict(l=[1,2,3], d={'k':'v'})
+ self.original_sample = copy.deepcopy(self.sample)
+ self.view = ReadOnlyDictView(self.sample)
+
+ def test_readonlydictview_getitem(self):
+ l = self.view['l']
+ self.assertEqual(l, self.sample['l'])
+
+ # Assert that modification changed only copied value
+ l.append(4)
+ self.assertNotEqual(l, self.sample['l'])
+
+ # Assert that viewed dict is not changed
+ self.assertEqual(self.sample, self.original_sample)
+
+ def test_readonlydictview_contains(self):
+ self.assertEqual('l' in self.view, 'l' in self.sample)
+ self.assertEqual('d' in self.view, 'd' in self.sample)
+ self.assertEqual('k' in self.view, 'k' in self.sample)
+
+ # Assert that viewed dict is not changed
+ self.assertEqual(self.sample, self.original_sample)
+
+ def test_readonlydictview_iter(self):
+ self.assertEqual(list(k for k in self.view),
+ list(k for k in self.sample))
+
+ # Assert the view is correct after modification
+ self.sample['new'] = 'value'
+ self.assertEqual(list(k for k in self.view),
+ list(k for k in self.sample))
+
+ def test_readonlydictview_len(self):
+ self.assertEqual(len(self.view), len(self.sample))
+
+ # Assert the view is correct after modification
+ self.sample['new'] = 'value'
+ self.assertEqual(len(self.view), len(self.sample))
+
+ def test_readonlydictview_get(self):
+ l = self.view.get('l')
+ self.assertEqual(l, self.sample.get('l'))
+
+ # Assert that modification changed only copied value
+ l.append(4)
+ self.assertNotEqual(l, self.sample.get('l'))
+
+ # Assert that viewed dict is not changed
+ self.assertEqual(self.sample, self.original_sample)
+
+ def test_readonlydict_items(self):
+ view_items = self.view.items()
+ sample_items = list(self.sample.items())
+ self.assertEqual(view_items, sample_items)
+
+ view_items.append('newkey')
+ self.assertNotEqual(view_items, sample_items)
+ self.assertEqual(self.sample, self.original_sample)
+
+ def test_readonlydict_values(self):
+ view_values = self.view.values()
+ sample_values = list(self.sample.values())
+ self.assertEqual(view_values, sample_values)
+
+ view_list_item = list(filter(lambda x: type(x) is list,
+ view_values))[0]
+ view_list_item.append(4)
+ self.assertNotEqual(view_values, sample_values)
+ self.assertEqual(self.sample, self.original_sample)