diff --git a/testing/test_config.py b/testing/test_config.py
index d28b9110413..2556e4e00aa 100644
--- a/testing/test_config.py
+++ b/testing/test_config.py
@@ -2356,7 +2356,16 @@ def test_override_ini_without_config_file(self, pytester: Pytester) -> None:
             }
         )
         result = pytester.runpytest("--override-ini", "pythonpath=src")
-        assert result.parseoutcomes() == {"passed": 1}
+        result.assert_outcomes(passed=1)
+
+    def test_override_ini_invalid_option(self, pytester: Pytester) -> None:
+        result = pytester.runpytest("--override-ini", "doesnotexist=true")
+        result.stdout.fnmatch_lines(
+            [
+                "=*= warnings summary =*=",
+                "*PytestConfigWarning:*Unknown config option: doesnotexist",
+            ]
+        )
 
 
 def test_help_via_addopts(pytester: Pytester) -> None: