feat(test): Failure test case for mypyc dictionary subclass views

mypyc/test-data/run-dicts.test

@@ -230,6 +230,7 @@ c
 
 [case testDictMethods]
 from collections import defaultdict
+from typing import DefaultDict  # type: ignore [attr-defined]
 from typing import Dict, Optional, List, Set
 
 def test_dict_clear() -> None:
@@ -265,6 +266,45 @@ class MyDict(dict):
         else:
             return super().setdefault(k, v) + 10
 
+class MyComplexDict(DefaultDict[str, int], MyDict):
+    pass
+
+def test_dict_keys() -> None:
+    d: Dict[str, Optional[int]] = {'a': 1, 'b': 2}
+    assert list(d.keys()) == ['a', 'b']
+
+def test_dict_subclass_keys() -> None:
+    d = MyDict({'a': 1, 'b': 2})
+    assert list(d.keys()) == ['a', 'b']
+
+def test_dict_subclass_complex_keys() -> None:
+    d = MyComplexDict(int, {'a': 1, 'b': 2})
+    assert list(d.keys()) == ['a', 'b']
+
+def test_dict_values() -> None:
+    d: Dict[str, Optional[int]] = {'a': 1, 'b': 2}
+    assert list(d.values()) == [1, 2]
+
+def test_dict_subclass_values() -> None:
+    d = MyDict({'a': 1, 'b': 2})
+    assert list(d.values()) == [1, 2]
+
+def test_dict_subclass_complex_values() -> None:
+    d = MyComplexDict(int, {'a': 1, 'b': 2})
+    assert list(d.values()) == [1, 2]
+
+def test_dict_items() -> None:
+    d: Dict[str, Optional[int]] = {'a': 1, 'b': 2}
+    assert list(d.items()) == [('a', 1), ('b', 2)]
+
+def test_dict_subclass_items() -> None:
+    d = MyDict({'a': 1, 'b': 2})
+    assert list(d.items()) == [('a', 1), ('b', 2)]
+
+def test_dict_subclass_complex_items() -> None:
+    d = MyComplexDict(int, {'a': 1, 'b': 2})
+    assert list(d.items()) == [('a', 1), ('b', 2)]
+
 def test_dict_setdefault() -> None:
     d: Dict[str, Optional[int]] = {'a': 1, 'b': 2}
     assert d.setdefault('a', 2) == 1