Issue #15225: improve error message when hmac is passed a wrong key type.

Patch by Marc Abramowitz.

1 files changed, 12 insertions, 0 deletions

diff --git a/Lib/test/test_hmac.py b/Lib/test/test_hmac.py
index 11cacb4d03..4ca7cec44c 100644
--- a/Lib/test/test_hmac.py
+++ b/Lib/test/test_hmac.py
@@ -234,6 +234,18 @@ class ConstructorTestCase(unittest.TestCase):
         except:
             self.fail("Standard constructor call raised exception.")
 
+    def test_with_str_key(self):
+        # Pass a key of type str, which is an error, because it expects a key
+        # of type bytes
+        with self.assertRaises(TypeError):
+            h = hmac.HMAC("key")
+
+    def test_dot_new_with_str_key(self):
+        # Pass a key of type str, which is an error, because it expects a key
+        # of type bytes
+        with self.assertRaises(TypeError):
+            h = hmac.new("key")
+
     def test_withtext(self):
         # Constructor call with text.
         try: