diff -r e0bc42883ecd Lib/test/test_urllib.py
--- a/Lib/test/test_urllib.py	Sun Jun 01 13:47:34 2014 -0700
+++ b/Lib/test/test_urllib.py	Sat Jun 07 12:44:37 2014 -0700
@@ -89,6 +89,26 @@
         http.client.HTTPConnection = self._connection_class
 
 
+class FakeFTPMixin(object):
+    def fakeftp(self):
+        class FakeFtpWrapper(object):
+            def __init__(self,  user, passwd, host, port, dirs, timeout=None,
+                     persistent=True):
+                pass
+
+            def retrfile(self, file, type):
+                return io.StringIO(), 0
+
+            def close(self):
+                pass
+    
+        self._ftpwrapper_class = urllib.request.ftpwrapper
+        urllib.request.ftpwrapper = FakeFtpWrapper
+
+    def unfakeftp(self):
+        urllib.request.ftpwrapper = self._ftpwrapper_class
+
+
 class urlopen_FileTests(unittest.TestCase):
     """Test urlopen() opening a temporary file.
 
@@ -195,7 +215,7 @@
         self.env.set('NO_PROXY', 'localhost, anotherdomain.com, newdomain.com')
         self.assertTrue(urllib.request.proxy_bypass_environment('anotherdomain.com'))
 
-class urlopen_HttpTests(unittest.TestCase, FakeHTTPMixin):
+class urlopen_HttpTests(unittest.TestCase, FakeHTTPMixin, FakeFTPMixin):
     """Test urlopen() opening a fake http connection."""
 
     def check_read(self, ver):
@@ -309,6 +329,13 @@
         self.assertFalse(e.exception.filename)
         self.assertTrue(e.exception.reason)
 
+    def test_ftp_cache_pruning(self):
+        urllib.request.MAXFTPCACHE = 0
+        self.fakeftp()
+        urllib.request.ftpcache['test'] = urllib.request.ftpwrapper('user', 'pass', 'localhost', 21, [])
+        urlopen('ftp://localhost')
+        self.unfakeftp()
+
 
     def test_userpass_inurl(self):
         self.fakehttp(b"HTTP/1.0 200 OK\r\n\r\nHello!")