python 3.11 fixes: native support for un-stringable exceptions

Author: asottile

testing/test_assertion.py

@@ -1648,7 +1648,7 @@ def test_raise_assertion_error():
     )
 
 
-def test_raise_assertion_error_raisin_repr(pytester: Pytester) -> None:
+def test_raise_assertion_error_raising_repr(pytester: Pytester) -> None:
     pytester.makepyfile(
         """
         class RaisingRepr(object):
@@ -1659,9 +1659,15 @@ def test_raising_repr():
     """
     )
     result = pytester.runpytest()
-    result.stdout.fnmatch_lines(
-        ["E       AssertionError: <unprintable AssertionError object>"]
-    )
+    if sys.version_info >= (3, 11):
+        # python 3.11 has native support for un-str-able exceptions
+        result.stdout.fnmatch_lines(
+            ["E       AssertionError: <exception str() failed>"]
+        )
+    else:
+        result.stdout.fnmatch_lines(
+            ["E       AssertionError: <unprintable AssertionError object>"]
+        )
 
 
 def test_issue_1944(pytester: Pytester) -> None: