test: Follow the new behavior of typing.get_type_hints() since py311

Since python-3.11, `typing.get_type_hints()` will not add Optional[t] to
type annotations even if a default value for function argument is None.

refs: python/cpython#30304 (bpo-46195)

Author: tk0miya

tests/test_ext_autodoc_configs.py

@@ -599,6 +599,11 @@ def test_mocked_module_imports(app, warning):
 @pytest.mark.sphinx('html', testroot='ext-autodoc',
                     confoverrides={'autodoc_typehints': "signature"})
 def test_autodoc_typehints_signature(app):
+    if sys.version_info < (3, 11):
+        type_o = "typing.Optional[typing.Any]"
+    else:
+        type_o = "typing.Any"
+
     options = {"members": None,
                "undoc-members": None}
     actual = do_autodoc(app, 'module', 'target.typehints', options)
@@ -612,7 +617,7 @@ def test_autodoc_typehints_signature(app):
         '   :type: int',
         '',
         '',
-        '.. py:class:: Math(s: str, o: typing.Optional[typing.Any] = None)',
+        '.. py:class:: Math(s: str, o: %s = None)' % type_o,
         '   :module: target.typehints',
         '',
         '',
@@ -1146,6 +1151,11 @@ def test_autodoc_typehints_description_and_type_aliases(app):
 @pytest.mark.sphinx('html', testroot='ext-autodoc',
                     confoverrides={'autodoc_typehints_format': "short"})
 def test_autodoc_typehints_format_short(app):
+    if sys.version_info < (3, 11):
+        type_o = "~typing.Optional[~typing.Any]"
+    else:
+        type_o = "~typing.Any"
+
     options = {"members": None,
                "undoc-members": None}
     actual = do_autodoc(app, 'module', 'target.typehints', options)
@@ -1159,7 +1169,7 @@ def test_autodoc_typehints_format_short(app):
         '   :type: int',
         '',
         '',
-        '.. py:class:: Math(s: str, o: ~typing.Optional[~typing.Any] = None)',
+        '.. py:class:: Math(s: str, o: %s = None)' % type_o,
         '   :module: target.typehints',
         '',
         '',

tests/test_util_inspect.py

@@ -190,7 +190,10 @@ def test_signature_annotations():
 
     # Space around '=' for defaults
     sig = inspect.signature(f7)
-    assert stringify_signature(sig) == '(x: typing.Optional[int] = None, y: dict = {}) -> None'
+    if sys.version_info < (3, 11):
+        assert stringify_signature(sig) == '(x: typing.Optional[int] = None, y: dict = {}) -> None'
+    else:
+        assert stringify_signature(sig) == '(x: int = None, y: dict = {}) -> None'
 
     # Callable types
     sig = inspect.signature(f8)
@@ -261,11 +264,17 @@ def test_signature_annotations():
 
     # show_return_annotation is False
     sig = inspect.signature(f7)
-    assert stringify_signature(sig, show_return_annotation=False) == '(x: typing.Optional[int] = None, y: dict = {})'
+    if sys.version_info < (3, 11):
+        assert stringify_signature(sig, show_return_annotation=False) == '(x: typing.Optional[int] = None, y: dict = {})'
+    else:
+        assert stringify_signature(sig, show_return_annotation=False) == '(x: int = None, y: dict = {})'
 
     # unqualified_typehints is True
     sig = inspect.signature(f7)
-    assert stringify_signature(sig, unqualified_typehints=True) == '(x: ~typing.Optional[int] = None, y: dict = {}) -> None'
+    if sys.version_info < (3, 11):
+        assert stringify_signature(sig, unqualified_typehints=True) == '(x: ~typing.Optional[int] = None, y: dict = {}) -> None'
+    else:
+        assert stringify_signature(sig, unqualified_typehints=True) == '(x: int = None, y: dict = {}) -> None'
 
 
 @pytest.mark.skipif(sys.version_info < (3, 8), reason='python 3.8+ is required.')