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diff --git a/lang/python/tests/t-quick-subkey-creation.py b/lang/python/tests/t-quick-subkey-creation.py
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+++ b/lang/python/tests/t-quick-subkey-creation.py
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+#!/usr/bin/env python
+
+# Copyright (C) 2017 g10 Code GmbH
+#
+# This file is part of GPGME.
+#
+# GPGME is free software; you can redistribute it and/or modify it
+# under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2 of the License, or
+# (at your option) any later version.
+#
+# GPGME is distributed in the hope that it will be useful, but WITHOUT
+# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+# or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General
+# Public License for more details.
+#
+# You should have received a copy of the GNU Lesser General Public
+# License along with this program; if not, see <http://www.gnu.org/licenses/>.
+
+from __future__ import absolute_import, print_function, unicode_literals
+del absolute_import, print_function, unicode_literals
+
+import gpg
+import itertools
+import os
+import shutil
+import time
+
+import support
+
+alpha = "Alpha <[email protected]>"
+bravo = "Bravo <[email protected]>"
+
+def copy_configuration(destination):
+    home = os.environ['GNUPGHOME']
+    shutil.copy(os.path.join(home, "gpg.conf"), destination)
+    shutil.copy(os.path.join(home, "gpg-agent.conf"), destination)
+
+with support.TemporaryDirectory() as tmp:
+    copy_configuration(tmp)
+    with gpg.Context(home_dir=tmp) as ctx:
+        res = ctx.create_key(alpha, certify=True)
+        keys = list(ctx.keylist())
+        assert len(keys) == 1, "Weird number of keys created"
+        key = keys[0]
+        assert key.fpr == res.fpr
+        assert len(key.subkeys) == 1, "Expected one primary key and no subkeys"
+
+        def get_subkey(fpr):
+            k = ctx.get_key(fpr)
+            for sk in k.subkeys:
+                if sk.fpr == fpr:
+                    return sk
+            return None
+
+        # Check gpg.constants.create.NOEXPIRE...
+        res = ctx.create_subkey(key, expires=False)
+        subkey = get_subkey(res.fpr)
+        assert subkey.expires == 0, "Expected subkey not to expire"
+        assert subkey.can_encrypt, \
+            "Default subkey capabilities do not include encryption"
+
+        t = 2 * 24 * 60 * 60
+        slack = 5 * 60
+        res = ctx.create_subkey(key, expires_in=t)
+        subkey = get_subkey(res.fpr)
+        assert abs(time.time() + t - subkey.expires) < slack, \
+            "subkeys expiration time is off"
+
+        # Check capabilities
+        for sign, encrypt, authenticate in itertools.product([False, True],
+                                                             [False, True],
+                                                             [False, True]):
+            # Filter some out
+            if not (sign or encrypt or authenticate):
+                # This triggers the default capabilities tested before.
+                continue
+
+            res = ctx.create_subkey(key, sign=sign, encrypt=encrypt,
+                                    authenticate=authenticate)
+            subkey = get_subkey(res.fpr)
+            assert sign == subkey.can_sign
+            assert encrypt == subkey.can_encrypt
+            assert authenticate == subkey.can_authenticate
+
+        # Check algorithm
+        res = ctx.create_subkey(key, algorithm="rsa")
+        subkey = get_subkey(res.fpr)
+        assert subkey.pubkey_algo == 1
+
+        # Check algorithm with size
+        res = ctx.create_subkey(key, algorithm="rsa1024")
+        subkey = get_subkey(res.fpr)
+        assert subkey.pubkey_algo == 1
+        assert subkey.length == 1024
+
+        # Check algorithm future-default
+        ctx.create_subkey(key, algorithm="future-default")
+
+        # Check passphrase protection.  For this we create a new key
+        # so that we have a key with just one encryption subkey.
+        bravo_res = ctx.create_key(bravo, certify=True)
+        bravo_key = ctx.get_key(bravo_res.fpr)
+        assert len(bravo_key.subkeys) == 1, "Expected one primary key and no subkeys"
+
+        passphrase = "streng geheim"
+        res = ctx.create_subkey(bravo_key, passphrase=passphrase)
+        ciphertext, _, _ = ctx.encrypt(b"hello there",
+                                       recipients=[ctx.get_key(bravo_res.fpr)])
+
+        cb_called = False
+        def cb(*args):
+            global cb_called
+            cb_called = True
+            return passphrase
+        ctx.pinentry_mode = gpg.constants.PINENTRY_MODE_LOOPBACK
+        ctx.set_passphrase_cb(cb)
+
+        plaintext, _, _ = ctx.decrypt(ciphertext)
+        assert plaintext == b"hello there"
+        assert cb_called