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

[miss-islington]

https://github.com/python/cpython/commit/29eefcc9c688bc4097f2660de1fa846c5ea54735
commit: 29eefcc9c688bc4097f2660de1fa846c5ea54735
branch: 3.9
author: Miss Islington (bot) <31488909+miss-islington at users.noreply.github.com>
committer: miss-islington <31488909+miss-islington at users.noreply.github.com>
date: 2022-01-26T02:40:40-08:00
summary:

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

(cherry picked from commit d0c690b5f85c679de6059cf353fe0524e905530e)

Co-authored-by: Nikita Sobolev <mail at sobolevn.me>

files:
M Lib/test/test_typing.py

diff --git a/Lib/test/test_typing.py b/Lib/test/test_typing.py
index f87832a631d49..f70311c95b24e 100644
--- a/Lib/test/test_typing.py
+++ b/Lib/test/test_typing.py
@@ -304,6 +304,15 @@ def test_repr(self):
         u = Union[list[int], dict[str, float]]
         self.assertEqual(repr(u), 'typing.Union[list[int], dict[str, 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):