Update test_inspect and test_doctest

Author: vstinner

Lib/test/test_doctest/test_doctest.py

@@ -742,7 +742,7 @@ def non_Python_modules(): r"""
 
     >>> import builtins
     >>> tests = doctest.DocTestFinder().find(builtins)
-    >>> 750 < len(tests) < 800 # approximate number of objects with docstrings
+    >>> 750 < len(tests) < 850 # approximate number of objects with docstrings
     True
     >>> real_tests = [t for t in tests if len(t.examples) > 0]
     >>> len(real_tests) # objects that actually have doctests

Lib/test/test_inspect/test_inspect.py

@@ -6056,7 +6056,8 @@ def _test_builtin_methods_have_signatures(self, cls, no_signature, unsupported_s
                 self.assertRaises(ValueError, inspect.signature, getattr(cls, name))
 
     def test_builtins_have_signatures(self):
-        no_signature = {'type', 'super', 'bytearray', 'bytes', 'dict', 'int', 'str'}
+        no_signature = {'type', 'super', 'bytearray', 'bytes',
+                        'dict', 'frozendict', 'int', 'str'}
         # These need PEP 457 groups
         needs_groups = {"range", "slice", "dir", "getattr",
                         "next", "iter", "vars"}