diff -r 9623c83ba489 Lib/test/test_hmac.py
--- a/Lib/test/test_hmac.py	Wed Jun 27 15:26:26 2012 -0400
+++ b/Lib/test/test_hmac.py	Fri Jun 29 11:49:10 2012 -0700
@@ -234,6 +234,22 @@
         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")
+            self.fail("Expected TypeError because we passed a str key and it"
+                      " should be bytes")
+
+    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")
+            self.fail("Expected TypeError because we passed a str key and it"
+                      " should be bytes")
+
     def test_withtext(self):
         # Constructor call with text.
         try: