diff --git a/gnupg/gnupg.py b/gnupg/gnupg.py
index a36aad1..b6702d3 100644
--- a/gnupg/gnupg.py
+++ b/gnupg/gnupg.py
@@ -660,7 +660,7 @@ class GPG(object):
         f.close()
         return key
 
-    def gen_key_input(self, **kwargs):
+    def gen_key_input(self, testing=False, **kwargs):
         """Generate a batch file for input to :meth:`GPG.gen_key()`.
 
         The GnuPG batch file key generation feature allows unattended key
@@ -720,27 +720,43 @@ class GPG(object):
         """
 
         parms = {}
+
         for key, val in list(kwargs.items()):
             key = key.replace('_','-').title()
             if str(val).strip():    # skip empty strings
                 parms[key] = val
+
         parms.setdefault('Key-Type', 'RSA')
         parms.setdefault('Key-Length', 4096)
         parms.setdefault('Name-Real', "Autogenerated Key")
         parms.setdefault('Expire-Date', _util._next_year())
+
         try:
             logname = os.environ['LOGNAME']
         except KeyError:
             logname = os.environ['USERNAME']
         hostname = socket.gethostname()
-        parms.setdefault('Name-Email', "%s@%s"
-                         % (logname.replace(' ', '_'), hostname))
+
+        parms.setdefault('Name-Email', "%s@%s" % (logname.replace(' ', '_'),
+                                                  hostname))
+
+        if testing:
+            ## This specific comment string is required by (some? all?)
+            ## versions of GnuPG to use the insecure PRNG:
+            parms.setdefault('Name-Comment', 'insecure!')
 
         out = "Key-Type: %s\n" % parms.pop('Key-Type')
+
         for key, val in list(parms.items()):
             out += "%s: %s\n" % (key, val)
+
         out += "%%pubring %s\n" % self.pubring
         out += "%%secring %s\n" % self.secring
+
+        if testing:
+            out += "%no-protection\n"
+            out += "%transient-key\n"
+            
         out += "%commit\n"
         return out
 
diff --git a/gnupg/tests/test_gnupg.py b/gnupg/tests/test_gnupg.py
index 2d93c11..bc85176 100644
--- a/gnupg/tests/test_gnupg.py
+++ b/gnupg/tests/test_gnupg.py
@@ -265,7 +265,6 @@ class GPGTestCase(unittest.TestCase):
 
         batch = {'Key-Type': key_type,
                  'Key-Length': key_length,
-                 'Name-Comment': 'python-gnupg tester',
                  'Expire-Date': 1,
                  'Name-Real': '%s' % real_name,
                  'Name-Email': ("%s@%s" % (name, email_domain))}
@@ -276,7 +275,7 @@ class GPGTestCase(unittest.TestCase):
             batch['Subkey-Type'] = subkey_type
             batch['Subkey-Length'] = key_length
 
-        key_input = self.gpg.gen_key_input(**batch)
+        key_input = self.gpg.gen_key_input(testing=True, **batch)
         return key_input
 
     def generate_key(self, real_name, email_domain, **kwargs):
@@ -568,7 +567,7 @@ class GPGTestCase(unittest.TestCase):
         self.assertAlmostEqual(int(now), int(verified.timestamp), delta=1000)
         self.assertEqual(
             verified.username,
-            u'Bruce Schneier (python-gnupg tester) <bruceschneier@schneier.com>')
+            u'Bruce Schneier (insecure!) <bruceschneier@schneier.com>')
 
     def test_signature_verification_clearsign(self):
         """Test verfication of an embedded signature."""