From 62c6f5368995a96c8beff5da1a8c5f1ea30364fc Mon Sep 17 00:00:00 2001
From: Volodymyr Kochetkov <whysages@gmail.com>
Date: Fri, 12 Jan 2024 08:57:36 +0200
Subject: [PATCH] feat: 10865

---
 changelog/10865.bugfix.rst                |  1 +
 src/_pytest/recwarn.py                    |  8 ++++++++
 testing/python/test_warning_attributes.py | 17 +++++++++++++++++
 3 files changed, 26 insertions(+)
 create mode 100644 changelog/10865.bugfix.rst
 create mode 100644 testing/python/test_warning_attributes.py

diff --git a/changelog/10865.bugfix.rst b/changelog/10865.bugfix.rst
new file mode 100644
index 000000000..0d1f9a9ff
--- /dev/null
+++ b/changelog/10865.bugfix.rst
@@ -0,0 +1 @@
+Fix a TypeError in a warning arguments call muted by warnings filter.
diff --git a/src/_pytest/recwarn.py b/src/_pytest/recwarn.py
index aa58d43b4..2a34730aa 100644
--- a/src/_pytest/recwarn.py
+++ b/src/_pytest/recwarn.py
@@ -329,3 +329,11 @@ class WarningsChecker(WarningsRecorder):
                         module=w.__module__,
                         source=w.source,
                     )
+            # Check warnings has valid argument type
+            wrn: warnings.WarningMessage
+            for wrn in self:
+                if isinstance(wrn.message, Warning):
+                    if not isinstance(wrn.message.args[0], str):
+                        raise TypeError(
+                            f"Warning message must be str, got {type(wrn.message.args[0])}"
+                        )
diff --git a/testing/python/test_warning_attributes.py b/testing/python/test_warning_attributes.py
new file mode 100644
index 000000000..8335685b4
--- /dev/null
+++ b/testing/python/test_warning_attributes.py
@@ -0,0 +1,17 @@
+from _pytest.pytester import Pytester
+
+
+class TestWarningAttributes:
+    def test_raise_type_error(self, pytester: Pytester) -> None:
+        pytester.makepyfile(
+            """
+            import pytest
+            import warnings
+
+            def test_example_one():
+                with pytest.warns(UserWarning):
+                    warnings.warn(1)
+            """
+        )
+        result = pytester.runpytest()
+        result.stdout.fnmatch_lines(["*1 failed*"])