CI fails with attrs 25.2.0

[jakkdl]

As seen in https://github.com/pytest-dev/pytest/actions/runs/13810374238 we're getting failing runs from attrs==25.2 in testing/test_assertion.py TestAssert_reprcompare_attrsclass

I bisected it to python-attrs/attrs#1407 - but am unfamiliar with both attr and the parts of pytest interacting with it so am leaving further exploration for somebody else.

[The-Compiler]

Culprit seems to be here:

pytest/src/_pytest/assertion/util.py

Lines 157 to 172 in d149ab3

	def has_default_eq(
	obj: object,
	) -> bool:
	"""Check if an instance of an object contains the default eq
	First, we check if the object's __eq__ attribute has __code__,
	if so, we check the equally of the method code filename (__code__.co_filename)
	to the default one generated by the dataclass and attr module
	for dataclasses the default co_filename is <string>, for attrs class, the __eq__ should contain "attrs eq generated"
	"""
	# inspired from https://github.com/willmcgugan/rich/blob/07d51ffc1aee6f16bd2e5a25b4e82850fb9ed778/rich/pretty.py#L68
	if hasattr(obj.__eq__, "__code__") and hasattr(obj.__eq__.__code__, "co_filename"):
	code_filename = obj.__eq__.__code__.co_filename
	if isattrs(obj):
	return "attrs generated eq" in code_filename

with attrs 25.1, objects show:

(Pdb) p code_filename
'<attrs generated eq test_assertion.TestAssert_reprcompare_attrsclass.test_attrs.<locals>.SimpleDataObject>'

but with 25.2:

(Pdb) p code_filename
'<attrs generated methods test_assertion.TestAssert_reprcompare_attrsclass.test_attrs.<locals>.SimpleDataObject>'

which also aligns with test changes in the PR you linked.

So I think all that'd be required is:

diff --git i/src/_pytest/assertion/util.py w/src/_pytest/assertion/util.py
index 30aee185d..c545e6cd2 100644
--- i/src/_pytest/assertion/util.py
+++ w/src/_pytest/assertion/util.py
@@ -169,7 +169,7 @@ def has_default_eq(
         code_filename = obj.__eq__.__code__.co_filename
 
         if isattrs(obj):
-            return "attrs generated eq" in code_filename
+            return "attrs generated " in code_filename
 
         return code_filename == "<string>"  # data class
     return True