1 files changed, 6 insertions, 0 deletions
diff --git a/Lib/test/test_bisect.py b/Lib/test/test_bisect.py
index 20f8b9d7c0..ba108221eb 100644
--- a/Lib/test/test_bisect.py
+++ b/Lib/test/test_bisect.py
@@ -257,6 +257,12 @@ class TestBisect:
                 target
             )
 
+    def test_insort_keynotNone(self):
+        x = []
+        y = {"a": 2, "b": 1}
+        for f in (self.module.insort_left, self.module.insort_right):
+            self.assertRaises(TypeError, f, x, y, key = "b")
+
 class TestBisectPython(TestBisect, unittest.TestCase):
     module = py_bisect