Fix testcases that failed in python3.10.0b4

Author: tk0miya

tests/test_util_inspect.py

@@ -215,11 +215,8 @@ def test_signature_annotations():
 
     # optional union
     sig = inspect.signature(f20)
-    if sys.version_info < (3, 7):
-        assert stringify_signature(sig) in ('() -> Optional[Union[int, str]]',
-                                            '() -> Optional[Union[str, int]]')
-    else:
-        assert stringify_signature(sig) == '() -> Optional[Union[int, str]]'
+    assert stringify_signature(sig) in ('() -> Optional[Union[int, str]]',
+                                        '() -> Optional[Union[str, int]]')
 
     # Any
     sig = inspect.signature(f14)

tests/test_util_typing.py

@@ -142,9 +142,9 @@ def test_restify_type_Literal():
 
 @pytest.mark.skipif(sys.version_info < (3, 10), reason='python 3.10+ is required.')
 def test_restify_type_union_operator():
-    assert restify(int | None) == "Optional[:class:`int`]"  # type: ignore
+    assert restify(int | None) == ":class:`int` | :obj:`None`"  # type: ignore
     assert restify(int | str) == ":class:`int` | :class:`str`"  # type: ignore
-    assert restify(int | str | None) == "Optional[:class:`int` | :class:`str`]"  # type: ignore
+    assert restify(int | str | None) == ":class:`int` | :class:`str` | :obj:`None`"  # type: ignore
 
 
 def test_restify_broken_type_hints():
@@ -253,9 +253,9 @@ def test_stringify_type_Literal():
 
 @pytest.mark.skipif(sys.version_info < (3, 10), reason='python 3.10+ is required.')
 def test_stringify_type_union_operator():
-    assert stringify(int | None) == "Optional[int]"  # type: ignore
+    assert stringify(int | None) == "int | None"  # type: ignore
     assert stringify(int | str) == "int | str"  # type: ignore
-    assert stringify(int | str | None) == "Optional[int | str]"  # type: ignore
+    assert stringify(int | str | None) == "int | str | None"  # type: ignore
 
 
 def test_stringify_broken_type_hints():