diff --git a/Lib/test/test_urllib.py b/Lib/test/test_urllib.py
index 875903e..a87ab71 100644
--- a/Lib/test/test_urllib.py
+++ b/Lib/test/test_urllib.py
@@ -126,10 +126,23 @@
         finally:
             self.unfakehttp()
 
+    def test_read_bogus(self):
+        # urlopen() should raise IOError for many error codes.
+        self.fakehttp(b'''HTTP/1.1 401 Authentication Required
+Date: Wed, 02 Jan 2008 03:03:54 GMT
+Server: Apache/1.3.33 (Debian GNU/Linux) mod_ssl/2.8.22 OpenSSL/0.9.7e
+Connection: close
+Content-Type: text/html; charset=iso-8859-1
+''')
+        try:
+            self.assertRaises(IOError, urllib.urlopen, "http://python.org/")
+        finally:
+            self.unfakehttp()
+
     def test_empty_socket(self):
         # urlopen() raises IOError if the underlying socket does not send any
         # data. (#1680230)
-        self.fakehttp(b"")
+        self.fakehttp(b'')
         try:
             self.assertRaises(IOError, urllib.urlopen, "http://something")
         finally: