bug fix

implement @bluetech changes

implement code review changes

changelog/11906.bugfix.rst

@@ -0,0 +1 @@
+Fix regression with :func:`pytest.warns` using custom warning subclasses which have more than one parameter in their `__init__`.

src/_pytest/recwarn.py

@@ -322,10 +322,10 @@ class WarningsChecker(WarningsRecorder):
             for w in self:
                 if not self.matches(w):
                     warnings.warn_explicit(
-                        str(w.message),
-                        w.message.__class__,  # type: ignore[arg-type]
-                        w.filename,
-                        w.lineno,
+                        message=w.message,
+                        category=w.category,
+                        filename=w.filename,
+                        lineno=w.lineno,
                         module=w.__module__,
                         source=w.source,
                     )

testing/test_recwarn.py

@@ -480,6 +480,8 @@ class TestWarns:
                 raise ValueError("some exception")
 
     def test_multiple_arg_custom_warning(self) -> None:
+        """Test for issue #11906."""
+
         class CustomWarning(UserWarning):
             def __init__(self, a, b):
                 pass