[Python-checkins] bpo-46529: increase coverage of `typing.Union.__repr__` method (GH-30911)

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https://github.com/python/cpython/commit/d0c690b5f85c679de6059cf353fe0524e905530e
commit: d0c690b5f85c679de6059cf353fe0524e905530e
branch: main
author: Nikita Sobolev <mail at sobolevn.me>
committer: Fidget-Spinner <28750310+Fidget-Spinner at users.noreply.github.com>
date: 2022-01-26T18:13:02+08:00
summary:

bpo-46529: increase coverage of `typing.Union.__repr__` method (GH-30911)

files:
M Lib/test/test_typing.py

diff --git a/Lib/test/test_typing.py b/Lib/test/test_typing.py
index 5777656552d79..b5767d02691d8 100644
--- a/Lib/test/test_typing.py
+++ b/Lib/test/test_typing.py
@@ -325,6 +325,15 @@ def test_repr(self):
         u = Union[int | float]
         self.assertEqual(repr(u), 'typing.Union[int, float]')
 
+        u = Union[None, str]
+        self.assertEqual(repr(u), 'typing.Optional[str]')
+        u = Union[str, None]
+        self.assertEqual(repr(u), 'typing.Optional[str]')
+        u = Union[None, str, int]
+        self.assertEqual(repr(u), 'typing.Union[NoneType, str, int]')
+        u = Optional[str]
+        self.assertEqual(repr(u), 'typing.Optional[str]')
+
     def test_cannot_subclass(self):
         with self.assertRaises(TypeError):
             class C(Union):