| 89 | class TestChainMap(unittest.TestCase): |
| 90 | |
| 91 | def test_basics(self): |
| 92 | c = ChainMap() |
| 93 | c['a'] = 1 |
| 94 | c['b'] = 2 |
| 95 | d = c.new_child() |
| 96 | d['b'] = 20 |
| 97 | d['c'] = 30 |
| 98 | self.assertEqual(d.maps, [{'b':20, 'c':30}, {'a':1, 'b':2}]) # check internal state |
| 99 | self.assertEqual(d.items(), dict(a=1, b=20, c=30).items()) # check items/iter/getitem |
| 100 | self.assertEqual(len(d), 3) # check len |
| 101 | for key in 'abc': # check contains |
| 102 | self.assertIn(key, d) |
| 103 | for k, v in dict(a=1, b=20, c=30, z=100).items(): # check get |
| 104 | self.assertEqual(d.get(k, 100), v) |
| 105 | |
| 106 | del d['b'] # unmask a value |
| 107 | self.assertEqual(d.maps, [{'c':30}, {'a':1, 'b':2}]) # check internal state |
| 108 | self.assertEqual(d.items(), dict(a=1, b=2, c=30).items()) # check items/iter/getitem |
| 109 | self.assertEqual(len(d), 3) # check len |
| 110 | for key in 'abc': # check contains |
| 111 | self.assertIn(key, d) |
| 112 | for k, v in dict(a=1, b=2, c=30, z=100).items(): # check get |
| 113 | self.assertEqual(d.get(k, 100), v) |
| 114 | self.assertIn(repr(d), [ # check repr |
| 115 | type(d).__name__ + "({'c': 30}, {'a': 1, 'b': 2})", |
| 116 | type(d).__name__ + "({'c': 30}, {'b': 2, 'a': 1})" |
| 117 | ]) |
| 118 | |
| 119 | for e in d.copy(), copy.copy(d): # check shallow copies |
| 120 | self.assertEqual(d, e) |
| 121 | self.assertEqual(d.maps, e.maps) |
| 122 | self.assertIsNot(d, e) |
| 123 | self.assertIsNot(d.maps[0], e.maps[0]) |
| 124 | for m1, m2 in zip(d.maps[1:], e.maps[1:]): |
| 125 | self.assertIs(m1, m2) |
| 126 | |
| 127 | # check deep copies |
| 128 | for proto in range(pickle.HIGHEST_PROTOCOL + 1): |
| 129 | e = pickle.loads(pickle.dumps(d, proto)) |
| 130 | self.assertEqual(d, e) |
| 131 | self.assertEqual(d.maps, e.maps) |
| 132 | self.assertIsNot(d, e) |
| 133 | for m1, m2 in zip(d.maps, e.maps): |
| 134 | self.assertIsNot(m1, m2, e) |
| 135 | for e in [copy.deepcopy(d), |
| 136 | eval(repr(d)) |
| 137 | ]: |
| 138 | self.assertEqual(d, e) |
| 139 | self.assertEqual(d.maps, e.maps) |
| 140 | self.assertIsNot(d, e) |
| 141 | for m1, m2 in zip(d.maps, e.maps): |
| 142 | self.assertIsNot(m1, m2, e) |
| 143 | |
| 144 | f = d.new_child() |
| 145 | f['b'] = 5 |
| 146 | self.assertEqual(f.maps, [{'b': 5}, {'c':30}, {'a':1, 'b':2}]) |
| 147 | self.assertEqual(f.parents.maps, [{'c':30}, {'a':1, 'b':2}]) # check parents |
| 148 | self.assertEqual(f['b'], 5) # find first in chain |