Add C API tests

Author: da-woods

Lib/test/test_capi/test_abstract.py

@@ -411,6 +411,11 @@ def test_mapping_getoptionalitem(self):
         self.assertEqual(getitem(dct2, 'a'), 1)
         self.assertEqual(getitem(dct2, 'b'), KeyError)
 
+        frozendct = frozendict(dct)
+        self.assertEqual(getitem(frozendct, 'a'), 1)
+        self.assertEqual(getitem(frozendct, 'b'), KeyError)
+        self.assertEqual(getitem(frozendct, '\U0001f40d'), 2)
+
         self.assertEqual(getitem(['a', 'b', 'c'], 1), 'b')
 
         self.assertRaises(TypeError, getitem, 42, 'a')
@@ -431,6 +436,11 @@ def test_mapping_getoptionalitemstring(self):
         self.assertEqual(getitemstring(dct2, b'a'), 1)
         self.assertEqual(getitemstring(dct2, b'b'), KeyError)
 
+        frozendct = frozendict(dct)
+        self.assertEqual(getitemstring(frozendct, 'a'), 1)
+        self.assertEqual(getitemstring(frozendct, 'b'), KeyError)
+        self.assertEqual(getitemstring(frozendct, '\U0001f40d'.encode()), 2)
+
         self.assertRaises(TypeError, getitemstring, 42, b'a')
         self.assertRaises(UnicodeDecodeError, getitemstring, {}, b'\xff')
         self.assertRaises(SystemError, getitemstring, {}, NULL)
@@ -677,8 +687,10 @@ def items(self):
         dict_obj = {'foo': 1, 'bar': 2, 'spam': 3}
 
         for mapping in [{}, OrderedDict(), Mapping1(), Mapping2(),
+                        frozendict(),
                         dict_obj, OrderedDict(dict_obj),
-                        Mapping1(dict_obj), Mapping2(dict_obj)]:
+                        Mapping1(dict_obj), Mapping2(dict_obj),
+                        frozendict(dict_obj)]:
             self.assertListEqual(_testlimitedcapi.mapping_keys(mapping),
                                  list(mapping.keys()))
             self.assertListEqual(_testlimitedcapi.mapping_values(mapping),