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	diff --git a/lang/python/tests/final.py b/lang/python/tests/final.py
	index 8e7ab339..65375cb8 100755
	--- a/lang/python/tests/final.py
	+++ b/lang/python/tests/final.py
	@@ -1,27 +1,29 @@
	#!/usr/bin/env python

	# Copyright (C) 2016 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 os
	import subprocess
	+import support
	+_ = support # to appease pyflakes.

	subprocess.check_call([os.path.join(os.getenv('top_srcdir'),
	"tests", "start-stop-agent"), "--stop"])
	diff --git a/lang/python/tests/t-callbacks.py b/lang/python/tests/t-callbacks.py
	index 94cf11ef..9a70cdae 100755
	--- a/lang/python/tests/t-callbacks.py
	+++ b/lang/python/tests/t-callbacks.py
	@@ -1,257 +1,256 @@
	#!/usr/bin/env python

	# Copyright (C) 2016 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 os
	import gpg
	import support
	-
	-support.assert_gpg_version()
	+_ = support # to appease pyflakes.

	c = gpg.Context()
	c.set_pinentry_mode(gpg.constants.PINENTRY_MODE_LOOPBACK)

	source = gpg.Data("Hallo Leute\n")
	sink = gpg.Data()

	# Valid passphrases, both as string and bytes.
	for passphrase in ('foo', b'foo'):
	def passphrase_cb(hint, desc, prev_bad, hook=None):
	assert hook == passphrase
	return hook

	c.set_passphrase_cb(passphrase_cb, passphrase)
	c.op_encrypt([], 0, source, sink)

	# Returning an invalid type.
	def passphrase_cb(hint, desc, prev_bad, hook=None):
	return 0

	c.set_passphrase_cb(passphrase_cb, None)
	try:
	c.op_encrypt([], 0, source, sink)
	except Exception as e:
	assert type(e) == TypeError
	assert str(e) == "expected str or bytes from passphrase callback, got int"
	else:
	assert False, "Expected an error, got none"

	# Raising an exception inside callback.
	myException = Exception()
	def passphrase_cb(hint, desc, prev_bad, hook=None):
	raise myException

	c.set_passphrase_cb(passphrase_cb, None)
	try:
	c.op_encrypt([], 0, source, sink)
	except Exception as e:
	assert e == myException
	else:
	assert False, "Expected an error, got none"

	# Wrong kind of callback function.
	def bad_passphrase_cb():
	pass

	c.set_passphrase_cb(bad_passphrase_cb, None)
	try:
	c.op_encrypt([], 0, source, sink)
	except Exception as e:
	assert type(e) == TypeError
	else:
	assert False, "Expected an error, got none"



	# Test the progress callback.
	parms = """<GnupgKeyParms format="internal">
	Key-Type: RSA
	Key-Length: 1024
	Name-Real: Joe Tester
	Name-Comment: with stupid passphrase
	Name-Email: joe+gpg@example.org
	Passphrase: Crypt0R0cks
	Expire-Date: 2020-12-31
	</GnupgKeyParms>
	"""

	messages = []
	def progress_cb(what, typ, current, total, hook=None):
	assert hook == messages
	messages.append(
	"PROGRESS UPDATE: what = {}, type = {}, current = {}, total = {}"
	.format(what, typ, current, total))

	c = gpg.Context()
	c.set_progress_cb(progress_cb, messages)
	c.op_genkey(parms, None, None)
	assert len(messages) > 0

	# Test exception handling.
	def progress_cb(what, typ, current, total, hook=None):
	raise myException

	c = gpg.Context()
	c.set_progress_cb(progress_cb, None)
	try:
	c.op_genkey(parms, None, None)
	except Exception as e:
	assert e == myException
	else:
	assert False, "Expected an error, got none"


	# Test the edit callback.
	c = gpg.Context()
	c.set_pinentry_mode(gpg.constants.PINENTRY_MODE_LOOPBACK)
	c.set_passphrase_cb(lambda *args: "abc")
	sink = gpg.Data()
	alpha = c.get_key("A0FF4590BB6122EDEF6E3C542D727CC768697734", False)

	cookie = object()
	edit_cb_called = False
	def edit_cb(status, args, hook):
	global edit_cb_called
	edit_cb_called = True
	assert hook == cookie
	return "quit" if args == "keyedit.prompt" else None
	c.op_edit(alpha, edit_cb, cookie, sink)
	assert edit_cb_called

	# Test exceptions.
	c = gpg.Context()
	c.set_pinentry_mode(gpg.constants.PINENTRY_MODE_LOOPBACK)
	c.set_passphrase_cb(lambda *args: "abc")
	sink = gpg.Data()

	def edit_cb(status, args):
	raise myException
	try:
	c.op_edit(alpha, edit_cb, None, sink)
	except Exception as e:
	assert e == myException
	else:
	assert False, "Expected an error, got none"



	# Test the status callback.
	source = gpg.Data("Hallo Leute\n")
	sink = gpg.Data()

	status_cb_called = False
	def status_cb(keyword, args, hook=None):
	global status_cb_called
	status_cb_called = True
	assert hook == cookie

	c = gpg.Context()
	c.set_status_cb(status_cb, cookie)
	c.set_ctx_flag("full-status", "1")
	c.op_encrypt([alpha], gpg.constants.ENCRYPT_ALWAYS_TRUST, source, sink)
	assert status_cb_called

	# Test exceptions.
	source = gpg.Data("Hallo Leute\n")
	sink = gpg.Data()

	def status_cb(keyword, args):
	raise myException

	c = gpg.Context()
	c.set_status_cb(status_cb, None)
	c.set_ctx_flag("full-status", "1")
	try:
	c.op_encrypt([alpha], gpg.constants.ENCRYPT_ALWAYS_TRUST, source, sink)
	except Exception as e:
	assert e == myException
	else:
	assert False, "Expected an error, got none"



	# Test the data callbacks.
	def read_cb(amount, hook=None):
	assert hook == cookie
	return 0
	def release_cb(hook=None):
	assert hook == cookie
	data = gpg.Data(cbs=(read_cb, None, None, release_cb, cookie))
	try:
	data.read()
	except Exception as e:
	assert type(e) == TypeError
	else:
	assert False, "Expected an error, got none"

	def read_cb(amount):
	raise myException
	data = gpg.Data(cbs=(read_cb, None, None, lambda: None))
	try:
	data.read()
	except Exception as e:
	assert e == myException
	else:
	assert False, "Expected an error, got none"


	def write_cb(what, hook=None):
	assert hook == cookie
	return "wrong type"
	data = gpg.Data(cbs=(None, write_cb, None, release_cb, cookie))
	try:
	data.write(b'stuff')
	except Exception as e:
	assert type(e) == TypeError
	else:
	assert False, "Expected an error, got none"

	def write_cb(what):
	raise myException
	data = gpg.Data(cbs=(None, write_cb, None, lambda: None))
	try:
	data.write(b'stuff')
	except Exception as e:
	assert e == myException
	else:
	assert False, "Expected an error, got none"


	def seek_cb(offset, whence, hook=None):
	assert hook == cookie
	return "wrong type"
	data = gpg.Data(cbs=(None, None, seek_cb, release_cb, cookie))
	try:
	data.seek(0, os.SEEK_SET)
	except Exception as e:
	assert type(e) == TypeError
	else:
	assert False, "Expected an error, got none"

	def seek_cb(offset, whence):
	raise myException
	data = gpg.Data(cbs=(None, None, seek_cb, lambda: None))
	try:
	data.seek(0, os.SEEK_SET)
	except Exception as e:
	assert e == myException
	else:
	assert False, "Expected an error, got none"
	diff --git a/lang/python/tests/t-data.py b/lang/python/tests/t-data.py
	index d1facd40..33013193 100755
	--- a/lang/python/tests/t-data.py
	+++ b/lang/python/tests/t-data.py
	@@ -1,129 +1,131 @@
	#!/usr/bin/env python

	# Copyright (C) 2016 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 io
	import os
	import tempfile
	import gpg
	+import support
	+_ = support # to appease pyflakes.

	data = gpg.Data('Hello world!')
	assert data.read() == b'Hello world!'
	assert data.read() == b''

	data.seek(0, os.SEEK_SET)
	assert data.read() == b'Hello world!'
	assert data.read() == b''

	data = gpg.Data(b'Hello world!')
	assert data.read() == b'Hello world!'

	data = gpg.Data(b'Hello world!', copy=False)
	assert data.read() == b'Hello world!'

	data = gpg.Data()
	data.write('Hello world!')
	data.seek(0, os.SEEK_SET)
	assert data.read() == b'Hello world!'

	data = gpg.Data()
	data.write(b'Hello world!')
	data.seek(0, os.SEEK_SET)
	assert data.read() == b'Hello world!'

	binjunk = bytes(range(256))
	data = gpg.Data()
	data.write(binjunk)
	data.seek(0, os.SEEK_SET)
	assert data.read() == binjunk

	data = gpg.Data()
	data.set_file_name("foobar")
	assert data.get_file_name() == "foobar"

	# Test reading from an existing file.
	with tempfile.NamedTemporaryFile() as tmp:
	tmp.write(binjunk)
	tmp.flush()
	tmp.seek(0)

	# Open using name.
	data = gpg.Data(file=tmp.name)
	assert data.read() == binjunk

	# Open using name, without copying.
	if False:
	# delayed reads are not yet supported
	data = gpg.Data(file=tmp.name, copy=False)
	assert data.read() == binjunk

	# Open using stream.
	tmp.seek(0)
	data = gpg.Data(file=tmp)
	assert data.read() == binjunk

	# Open using stream, offset, and length.
	data = gpg.Data(file=tmp, offset=0, length=42)
	assert data.read() == binjunk[:42]

	# Open using name, offset, and length.
	data = gpg.Data(file=tmp.name, offset=23, length=42)
	assert data.read() == binjunk[23:23+42]

	# Test callbacks.
	class DataObject(object):
	def __init__(self):
	self.buffer = io.BytesIO()
	self.released = False

	def read(self, amount, hook=None):
	assert not self.released
	return self.buffer.read(amount)

	def write(self, data, hook=None):
	assert not self.released
	return self.buffer.write(data)

	def seek(self, offset, whence, hook=None):
	assert not self.released
	return self.buffer.seek(offset, whence)

	def release(self, hook=None):
	assert not self.released
	self.released = True

	do = DataObject()
	cookie = object()
	data = gpg.Data(cbs=(do.read, do.write, do.seek, do.release, cookie))
	data.write('Hello world!')
	data.seek(0, os.SEEK_SET)
	assert data.read() == b'Hello world!'
	del data
	assert do.released

	# Again, without the cookie.
	do = DataObject()
	data = gpg.Data(cbs=(do.read, do.write, do.seek, do.release))
	data.write('Hello world!')
	data.seek(0, os.SEEK_SET)
	assert data.read() == b'Hello world!'
	del data
	assert do.released
	diff --git a/lang/python/tests/t-edit.py b/lang/python/tests/t-edit.py
	index ffc32965..b1075a96 100755
	--- a/lang/python/tests/t-edit.py
	+++ b/lang/python/tests/t-edit.py
	@@ -1,72 +1,71 @@
	#!/usr/bin/env python

	# Copyright (C) 2005 Igor Belyi <belyi@users.sourceforge.net>
	# Copyright (C) 2016 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 sys
	import os
	import gpg
	import support
	-
	-support.assert_gpg_version()
	+_ = support # to appease pyflakes.

	class KeyEditor(object):
	def __init__(self):
	self.steps = ["fpr", "expire", "1", "primary", "quit"]
	self.step = 0
	self.done = False
	self.verbose = int(os.environ.get('verbose', 0)) > 1

	def edit_fnc(self, status, args, out=None):
	if args == "keyedit.prompt":
	result = self.steps[self.step]
	self.step += 1
	elif args == "keyedit.save.okay":
	result = "Y"
	self.done = self.step == len(self.steps)
	elif args == "keygen.valid":
	result = "0"
	else:
	result = None

	if self.verbose:
	sys.stderr.write("Code: {}, args: {!r}, Returning: {!r}\n"
	.format(status, args, result))

	return result

	c = gpg.Context()
	c.set_pinentry_mode(gpg.constants.PINENTRY_MODE_LOOPBACK)
	c.set_passphrase_cb(lambda *args: "abc")
	c.set_armor(True)

	# The deprecated interface.
	editor = KeyEditor()
	c.interact(c.get_key("A0FF4590BB6122EDEF6E3C542D727CC768697734", False),
	editor.edit_fnc)
	assert editor.done

	# The deprecated interface.
	sink = gpg.Data()
	editor = KeyEditor()
	c.op_edit(c.get_key("A0FF4590BB6122EDEF6E3C542D727CC768697734", False),
	editor.edit_fnc, sink, sink)
	assert editor.done
	diff --git a/lang/python/tests/t-encrypt-sym.py b/lang/python/tests/t-encrypt-sym.py
	index 8ee9cd6b..82992934 100755
	--- a/lang/python/tests/t-encrypt-sym.py
	+++ b/lang/python/tests/t-encrypt-sym.py
	@@ -1,85 +1,84 @@
	#!/usr/bin/env python

	# Copyright (C) 2016 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 os
	import gpg
	import support
	-
	-support.assert_gpg_version()
	+_ = support # to appease pyflakes.

	for passphrase in ("abc", b"abc"):
	c = gpg.Context()
	c.set_armor(True)
	c.set_pinentry_mode(gpg.constants.PINENTRY_MODE_LOOPBACK)

	source = gpg.Data("Hallo Leute\n")
	cipher = gpg.Data()

	passphrase_cb_called = 0
	def passphrase_cb(hint, desc, prev_bad, hook=None):
	global passphrase_cb_called
	passphrase_cb_called += 1
	return passphrase

	c.set_passphrase_cb(passphrase_cb, None)

	c.op_encrypt([], 0, source, cipher)
	assert passphrase_cb_called == 1, \
	"Callback called {} times".format(passphrase_cb_called)
	support.print_data(cipher)

	c = gpg.Context()
	c.set_armor(True)
	c.set_pinentry_mode(gpg.constants.PINENTRY_MODE_LOOPBACK)
	c.set_passphrase_cb(passphrase_cb, None)
	plain = gpg.Data()
	cipher.seek(0, os.SEEK_SET)

	c.op_decrypt(cipher, plain)
	# Seems like the passphrase is cached.
	#assert passphrase_cb_called == 2, \
	# "Callback called {} times".format(passphrase_cb_called)
	support.print_data(plain)

	plain.seek(0, os.SEEK_SET)
	plaintext = plain.read()
	assert plaintext == b"Hallo Leute\n", \
	"Wrong plaintext {!r}".format(plaintext)

	# Idiomatic interface.
	for passphrase in ("abc", b"abc"):
	with gpg.Context(armor=True) as c:
	# Check that the passphrase callback is not altered.
	def f(*args):
	assert False
	c.set_passphrase_cb(f)

	message = "Hallo Leute\n".encode()
	ciphertext, _, _ = c.encrypt(message,
	passphrase=passphrase,
	sign=False)
	assert ciphertext.find(b'BEGIN PGP MESSAGE') > 0, 'Marker not found'

	plaintext, _, _ = c.decrypt(ciphertext, passphrase=passphrase)
	assert plaintext == message, 'Message body not recovered'

	assert c._passphrase_cb[1] == f, "Passphrase callback not restored"
	diff --git a/lang/python/tests/t-file-name.py b/lang/python/tests/t-file-name.py
	index aab56802..32fe84a0 100755
	--- a/lang/python/tests/t-file-name.py
	+++ b/lang/python/tests/t-file-name.py
	@@ -1,44 +1,45 @@
	#!/usr/bin/env python

	# Copyright (C) 2016 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 os
	import gpg
	import support
	+_ = support # to appease pyflakes.

	testname = "abcde12345"

	c = gpg.Context()
	c.set_armor(True)

	source = gpg.Data("Hallo Leute\n")
	source.set_file_name(testname)
	cipher = gpg.Data()
	plain = gpg.Data()

	keys = []
	keys.append(c.get_key("A0FF4590BB6122EDEF6E3C542D727CC768697734", False))

	c.op_encrypt(keys, gpg.constants.ENCRYPT_ALWAYS_TRUST, source, cipher)
	cipher.seek(0, os.SEEK_SET)
	c.op_decrypt(cipher, plain)
	result = c.op_decrypt_result()
	assert result.file_name == testname
	diff --git a/lang/python/tests/t-idiomatic.py b/lang/python/tests/t-idiomatic.py
	index 826bc23c..b7ae4eb9 100755
	--- a/lang/python/tests/t-idiomatic.py
	+++ b/lang/python/tests/t-idiomatic.py
	@@ -1,82 +1,83 @@
	#!/usr/bin/env python

	# Copyright (C) 2016 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 sys
	import io
	import os
	import tempfile
	import gpg
	import support
	+_ = support # to appease pyflakes.

	# Both Context and Data can be used as context manager:
	with gpg.Context() as c, gpg.Data() as d:
	c.get_engine_info()
	d.write(b"Halloechen")
	leak_c = c
	leak_d = d
	assert leak_c.wrapped == None
	assert leak_d.wrapped == None

	def sign_and_verify(source, signed, sink):
	with gpg.Context() as c:
	c.op_sign(source, signed, gpg.constants.sig.mode.NORMAL)
	signed.seek(0, os.SEEK_SET)
	c.op_verify(signed, None, sink)
	result = c.op_verify_result()

	assert len(result.signatures) == 1, "Unexpected number of signatures"
	sig = result.signatures[0]
	assert sig.summary == (gpg.constants.sigsum.VALID \|
	gpg.constants.sigsum.GREEN)
	assert gpg.errors.GPGMEError(sig.status).getcode() == gpg.errors.NO_ERROR

	sink.seek(0, os.SEEK_SET)
	assert sink.read() == b"Hallo Leute\n"

	# Demonstrate automatic wrapping of file-like objects with 'fileno'
	# method.
	with tempfile.TemporaryFile() as source, \
	tempfile.TemporaryFile() as signed, \
	tempfile.TemporaryFile() as sink:
	source.write(b"Hallo Leute\n")
	source.seek(0, os.SEEK_SET)

	sign_and_verify(source, signed, sink)

	if sys.version_info[0] == 3:
	# Python2's io.BytesIO does not implement the buffer interface,
	# hence we cannot use it as sink.

	# XXX: Python's io.BytesIo.truncate does not work as advertised.
	# http://bugs.python.org/issue27261
	bio = io.BytesIO()
	bio.truncate(1)
	if len(bio.getvalue()) != 1:
	# This version of Python is affected, preallocate buffer.
	preallocate = 128*b'\x00'
	else:
	preallocate = b''

	# Demonstrate automatic wrapping of objects implementing the buffer
	# interface, and the use of data objects with the 'with' statement.
	with io.BytesIO(preallocate) as signed, gpg.Data() as sink:
	sign_and_verify(b"Hallo Leute\n", signed, sink)
	diff --git a/lang/python/tests/t-keylist-from-data.py b/lang/python/tests/t-keylist-from-data.py
	index 6a26267d..6503eb7a 100755
	--- a/lang/python/tests/t-keylist-from-data.py
	+++ b/lang/python/tests/t-keylist-from-data.py
	@@ -1,213 +1,211 @@
	#!/usr/bin/env python

	# Copyright (C) 2016 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 os
	-import sys
	import gpg
	import support

	support.assert_gpg_version((2, 1, 14))

	# Check expration of keys. This test assumes three subkeys of which
	# 2 are expired; it is used with the "Whisky" test key. It has
	# already been checked that these 3 subkeys are available.
	def check_whisky(name, key):
	sub1 = key.subkeys[2]
	sub2 = key.subkeys[3]

	assert sub1.expired and sub2.expired, \
	"Subkey of `{}' not flagged as expired".format(name)
	assert sub1.expires == 1129636886 and sub2.expires == 1129636939, \
	"Subkey of `{}' has wrong expiration date".format(name)

	keys = [
	[ "A0FF4590BB6122EDEF6E3C542D727CC768697734", "6AE6D7EE46A871F8",
	[ [ "Alfa Test", "demo key", "alfa@example.net" ],
	[ "Alpha Test", "demo key", "alpha@example.net" ],
	[ "Alice", "demo key", "" ] ], 1 ],
	[ "D695676BDCEDCC2CDD6152BCFE180B1DA9E3B0B2", "5381EA4EE29BA37F",
	[ [ "Bob", "demo key", "" ],
	[ "Bravo Test", "demo key", "bravo@example.net" ] ], 1 ],
	[ "61EE841A2A27EB983B3B3C26413F4AF31AFDAB6C", "E71E72ACBC43DA60",
	[ [ "Charlie Test", "demo key", "charlie@example.net" ] ], 1 ],
	[ "6560C59C43D031C54D7C588EEBA9F240EB9DC9E6", "06F22880B0C45424",
	[ [ "Delta Test", "demo key", "delta@example.net" ] ], 1 ],
	[ "3531152DE293E26A07F504BC318C1FAEFAEF6D1B", "B5C79E1A7272144D",
	[ [ "Echelon", "demo key", "" ],
	[ "Echo Test", "demo key", "echo@example.net" ],
	[ "Eve", "demo key", "" ] ], 1 ],
	[ "56D33268F7FE693FBB594762D4BF57F37372E243", "0A32EE79EE45198E",
	[ [ "Foxtrot Test", "demo key", "foxtrot@example.net" ] ], 1 ],
	[ "C9C07DCC6621B9FB8D071B1D168410A48FC282E6", "247491CC9DCAD354",
	[ [ "Golf Test", "demo key", "golf@example.net" ] ], 1 ],
	[ "9E91CBB11E4D4135583EF90513DB965534C6E3F1", "76E26537D622AD0A",
	[ [ "Hotel Test", "demo key", "hotel@example.net" ] ], 1 ],
	[ "CD538D6CC9FB3D745ECDA5201FE8FC6F04259677", "C1C8EFDE61F76C73",
	[ [ "India Test", "demo key", "india@example.net" ] ], 1 ],
	[ "F8F1EDC73995AB739AD54B380C820C71D2699313", "BD0B108735F8F136",
	[ [ "Juliet Test", "demo key", "juliet@example.net" ] ], 1 ],
	[ "3FD11083779196C2ECDD9594AD1B0FAD43C2D0C7", "86CBB34A9AF64D02",
	[ [ "Kilo Test", "demo key", "kilo@example.net" ] ], 1 ],
	[ "1DDD28CEF714F5B03B8C246937CAB51FB79103F8", "0363B449FE56350C",
	[ [ "Lima Test", "demo key", "lima@example.net" ] ], 1 ],
	[ "2686AA191A278013992C72EBBE794852BE5CF886", "5F600A834F31EAE8",
	[ [ "Mallory", "demo key", "" ],
	[ "Mike Test", "demo key", "mike@example.net" ] ], 1 ],
	[ "5AB9D6D7BAA1C95B3BAA3D9425B00FD430CEC684", "4C1D63308B70E472",
	[ [ "November Test", "demo key", "november@example.net" ] ], 1 ],
	[ "43929E89F8F79381678CAE515F6356BA6D9732AC", "FF0785712681619F",
	[ [ "Oscar Test", "demo key", "oscar@example.net" ] ], 1 ],
	[ "6FAA9C201E5E26DCBAEC39FD5D15E01D3FF13206", "2764E18263330D9C",
	[ [ "Papa test", "demo key", "papa@example.net" ] ], 1 ],
	[ "A7969DA1C3297AA96D49843F1C67EC133C661C84", "6CDCFC44A029ACF4",
	[ [ "Quebec Test", "demo key", "quebec@example.net" ] ], 1 ],
	[ "38FBE1E4BF6A5E1242C8F6A13BDBEDB1777FBED3", "9FAB805A11D102EA",
	[ [ "Romeo Test", "demo key", "romeo@example.net" ] ], 1 ],
	[ "045B2334ADD69FC221076841A5E67F7FA3AE3EA1", "93B88B0F0F1B50B4",
	[ [ "Sierra Test", "demo key", "sierra@example.net" ] ], 1 ],
	[ "ECAC774F4EEEB0620767044A58CB9A4C85A81F38", "97B60E01101C0402",
	[ [ "Tango Test", "demo key", "tango@example.net" ] ], 1 ],
	[ "0DBCAD3F08843B9557C6C4D4A94C0F75653244D6", "93079B915522BDB9",
	[ [ "Uniform Test", "demo key", "uniform@example.net" ] ], 1 ],
	[ "E8143C489C8D41124DC40D0B47AF4B6961F04784", "04071FB807287134",
	[ [ "Victor Test", "demo key", "victor@example.org" ] ], 1 ],
	[ "E8D6C90B683B0982BD557A99DEF0F7B8EC67DBDE", "D7FBB421FD6E27F6",
	[ [ "Whisky Test", "demo key", "whisky@example.net" ] ], 3,
	check_whisky ],
	[ "04C1DF62EFA0EBB00519B06A8979A6C5567FB34A", "5CC6F87F41E408BE",
	[ [ "XRay Test", "demo key", "xray@example.net" ] ], 1 ],
	[ "ED9B316F78644A58D042655A9EEF34CD4B11B25F", "5ADFD255F7B080AD",
	[ [ "Yankee Test", "demo key", "yankee@example.net" ] ], 1 ],
	[ "23FD347A419429BACCD5E72D6BC4778054ACD246", "EF9DC276A172C881",
	[ [ "Zulu Test", "demo key", "zulu@example.net" ] ], 1 ],
	]

	def check_global(key, uids, n_subkeys):
	assert not key.revoked, "Key unexpectedly revoked"
	assert not key.expired, "Key unexpectedly expired"
	assert not key.disabled, "Key unexpectedly disabled"
	assert not key.invalid, "Key unexpectedly invalid"
	assert key.can_sign, "Key unexpectedly unusable for signing"
	assert key.can_certify, "Key unexpectedly unusable for certifications"
	assert not key.secret, "Key unexpectedly secret"
	assert not key.protocol != gpg.constants.protocol.OpenPGP, \
	"Key has unexpected protocol: {}".format(key.protocol)
	assert not key.issuer_serial, \
	"Key unexpectedly carries issuer serial: {}".format(key.issuer_serial)
	assert not key.issuer_name, \
	"Key unexpectedly carries issuer name: {}".format(key.issuer_name)
	assert not key.chain_id, \
	"Key unexpectedly carries chain ID: {}".format(key.chain_id)
	assert key.owner_trust == gpg.constants.validity.UNKNOWN, \
	"Key has unexpected owner trust: {}".format(key.owner_trust)
	assert len(key.subkeys) - 1 == n_subkeys, \
	"Key `{}' has unexpected number of subkeys".format(uids[0][0])


	def check_subkey(fpr, which, subkey):
	assert not subkey.revoked, which + " key unexpectedly revoked"
	assert not subkey.expired, which + " key unexpectedly expired"
	assert not subkey.disabled, which + " key unexpectedly disabled"
	assert not subkey.invalid, which + " key unexpectedly invalid"

	if which == "Primary":
	assert not subkey.can_encrypt, \
	which + " key unexpectedly usable for encryption"
	assert subkey.can_sign, \
	which + " key unexpectedly unusable for signing"
	assert subkey.can_certify, \
	which + " key unexpectedly unusable for certifications"
	else:
	assert subkey.can_encrypt, \
	which + " key unexpectedly unusable for encryption"
	assert not subkey.can_sign, \
	which + " key unexpectedly usable for signing"
	assert not subkey.can_certify, \
	which + " key unexpectedly usable for certifications"

	assert not subkey.secret, which + " key unexpectedly secret"
	assert not subkey.is_cardkey, "Public key marked as card key"
	assert not subkey.card_number, "Public key with card number set"
	assert not subkey.pubkey_algo != (gpg.constants.pk.DSA if which == "Primary"
	else gpg.constants.pk.ELG_E), \
	which + " key has unexpected public key algo: {}".\
	format(subkey.pubkey_algo)
	assert subkey.length == 1024, \
	which + " key has unexpected length: {}".format(subkey.length)
	assert fpr.endswith(subkey.keyid), \
	which + " key has unexpected key ID: {}".format(subkey.keyid)
	assert which == "Secondary" or subkey.fpr == fpr, \
	which + " key has unexpected fingerprint: {}".format(subkey.fpr)
	assert not subkey.expires, \
	which + " key unexpectedly expires: {}".format(subkey.expires)

	def check_uid(which, ref, uid):
	assert not uid.revoked, which + " user ID unexpectedly revoked"
	assert not uid.invalid, which + " user ID unexpectedly invalid"
	assert uid.validity == gpg.constants.validity.UNKNOWN, \
	which + " user ID has unexpected validity: {}".format(uid.validity)
	assert not uid.signatures, which + " user ID unexpectedly signed"
	assert uid.name == ref[0], \
	"Unexpected name in {} user ID: {!r}".format(which.lower(), uid.name)
	assert uid.comment == ref[1], \
	"Unexpected comment in {} user ID: {!r}".format(which.lower(),
	uid.comment)
	assert uid.email == ref[2], \
	"Unexpected email in {} user ID: {!r}".format(which.lower(), uid.email)

	# Export all the data from our keyring...
	key_data = gpg.Data()
	with gpg.Context() as c:
	c.op_export_keys([c.get_key(k[0]) for k in keys], 0, key_data)

	# ... rewind the tape...
	key_data.rewind()

	# ... and feed it into a keylist in an empty context.
	with support.EphemeralContext() as c:
	for i, key in enumerate(c.keylist(source=key_data)):
	try:
	if len(keys[i]) == 4:
	fpr, sec_keyid, uids, n_subkeys = keys[i]
	misc_check = None
	else:
	fpr, sec_keyid, uids, n_subkeys, misc_check = keys[i]
	except IndexError:
	# There are more keys. We don't check for that.
	break

	# Global key flags.
	check_global(key, uids, n_subkeys)
	check_subkey(fpr, "Primary", key.subkeys[0])
	check_subkey(sec_keyid, "Secondary", key.subkeys[1])

	assert len(key.uids) == len(uids)
	check_uid("First", uids[0], key.uids[0])
	if len(key.uids) > 1:
	check_uid("Second", uids[1], key.uids[1])
	if len(key.uids) > 2:
	check_uid("Third", uids[2], key.uids[2])

	if misc_check:
	misc_check (uids[0][0], key)

	assert len(list(c.keylist())) == 0, "Keys were imported"
	diff --git a/lang/python/tests/t-protocol-assuan.py b/lang/python/tests/t-protocol-assuan.py
	index 27b28c72..8da50351 100755
	--- a/lang/python/tests/t-protocol-assuan.py
	+++ b/lang/python/tests/t-protocol-assuan.py
	@@ -1,72 +1,74 @@
	#!/usr/bin/env python

	# Copyright (C) 2016 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 support
	+_ = support # to appease pyflakes.

	with gpg.Context(protocol=gpg.constants.protocol.ASSUAN) as c:
	# Do nothing.
	err = c.assuan_transact('nop')
	assert err == None
	err = c.assuan_transact(b'NOP')
	assert err == None
	err = c.assuan_transact(['NOP'])
	assert err == None

	err = c.assuan_transact('idontexist')
	assert err.getsource() == gpg.errors.SOURCE_GPGAGENT
	assert err.getcode() == gpg.errors.ASS_UNKNOWN_CMD

	# Invoke the pinentry to get a confirmation.
	c.assuan_transact(['GET_CONFIRMATION', 'Hello there'])

	data = []
	def data_cb(line):
	data.append(line)

	err = c.assuan_transact(['GETINFO', 'version'], data_cb=data_cb)
	assert not err
	assert len(data) == 1

	data = []
	err = c.assuan_transact(['GETINFO', 's2k_count'], data_cb=data_cb)
	if not err:
	assert len(data) == 1
	assert int(data[0]) > 0

	# XXX HELP sends status lines if we could use ASSUAN_CONVEY_COMMENTS.

	status = []
	def status_cb(line, args):
	status.append((line, args))

	alphas_grip = '76F7E2B35832976B50A27A282D9B87E44577EB66'
	err = c.assuan_transact(['KEYINFO', alphas_grip], status_cb=status_cb)
	if not err:
	assert len(status) == 1
	line, args = status[0]
	assert line.startswith('KEYINFO')
	assert args.startswith(alphas_grip)

	# XXX: test these callbacks, e.g. using PRESET_PASSPHRASE
	# XXX: once issue2428 is resolved
	def inq_cb(name, args):
	print("inq_cb", name, args)
	diff --git a/lang/python/tests/t-sig-notation.py b/lang/python/tests/t-sig-notation.py
	index 22774974..bc8da2e6 100755
	--- a/lang/python/tests/t-sig-notation.py
	+++ b/lang/python/tests/t-sig-notation.py
	@@ -1,78 +1,79 @@
	#!/usr/bin/env python

	# Copyright (C) 2016 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 os
	import gpg
	import support
	+_ = support # to appease pyflakes.

	expected_notations = {
	"laughing@me": ("Just Squeeze Me", gpg.constants.sig.notation.HUMAN_READABLE),
	"preferred-email-encoding@pgp.com": ("pgpmime",
	gpg.constants.sig.notation.HUMAN_READABLE
	\| gpg.constants.sig.notation.CRITICAL),
	None: ("http://www.gnu.org/policy/", 0),
	}

	# GnuPG prior to 2.1.13 did not report the critical flag correctly.
	with gpg.Context() as c:
	version = c.engine_info.version
	have_correct_sig_data = not (version.startswith("1.")
	or version.startswith("2.0.")
	or version == "2.1.1"
	or (version.startswith("2.1.1")
	and version[5] < '3'))

	def check_result(result):
	assert len(result.signatures) == 1, "Unexpected number of signatures"
	sig = result.signatures[0]
	assert len(sig.notations) == len(expected_notations)

	for r in sig.notations:
	assert not 'name_len' in dir(r)
	assert not 'value_len' in dir(r)
	assert r.name in expected_notations
	value, flags = expected_notations.pop(r.name)

	assert r.value == value, \
	"Expected {!r}, got {!r}".format(value, r.value)
	assert r.human_readable \
	== bool(flags & gpg.constants.sig.notation.HUMAN_READABLE)
	assert r.critical \
	== (bool(flags & gpg.constants.sig.notation.CRITICAL)
	if have_correct_sig_data else False)

	assert len(expected_notations) == 0

	source = gpg.Data("Hallo Leute\n")
	signed = gpg.Data()

	c = gpg.Context()
	for name, (value, flags) in expected_notations.items():
	c.sig_notation_add(name, value, flags)

	c.op_sign(source, signed, gpg.constants.sig.mode.NORMAL)

	signed.seek(0, os.SEEK_SET)
	sink = gpg.Data()
	c.op_verify(signed, None, sink)
	result = c.op_verify_result()
	check_result(result)
	diff --git a/lang/python/tests/t-trustlist.py b/lang/python/tests/t-trustlist.py
	index 85865965..89524bb5 100755
	--- a/lang/python/tests/t-trustlist.py
	+++ b/lang/python/tests/t-trustlist.py
	@@ -1,42 +1,43 @@
	#!/usr/bin/env python

	# Copyright (C) 2016 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 support
	+_ = support # to appease pyflakes.

	c = gpg.Context()

	def dump_item(item):
	print("l={} k={} t={} o={} v={} u={}".format(
	item.level, item.keyid, item.type, item.owner_trust,
	item.validity, item.name))

	c.op_trustlist_start("alice", 0)
	while True:
	item = c.op_trustlist_next()
	if not item:
	break
	dump_item(item)
	c.op_trustlist_end()

	for item in c.op_trustlist_all("alice", 0):
	dump_item(item)
	diff --git a/lang/python/tests/t-verify.py b/lang/python/tests/t-verify.py
	index 03476382..320dae66 100755
	--- a/lang/python/tests/t-verify.py
	+++ b/lang/python/tests/t-verify.py
	@@ -1,192 +1,193 @@
	#!/usr/bin/env python

	# Copyright (C) 2016 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 sys
	import os
	import gpg
	import support
	+_ = support # to appease pyflakes.

	test_text1 = b"Just GNU it!\n"
	test_text1f= b"Just GNU it?\n"
	test_sig1 = b"""-----BEGIN PGP SIGNATURE-----

	iN0EABECAJ0FAjoS+i9FFIAAAAAAAwA5YmFyw7bDpMO8w58gZGFzIHdhcmVuIFVt
	bGF1dGUgdW5kIGpldHp0IGVpbiBwcm96ZW50JS1aZWljaGVuNRSAAAAAAAgAJGZv
	b2Jhci4xdGhpcyBpcyBhIG5vdGF0aW9uIGRhdGEgd2l0aCAyIGxpbmVzGhpodHRw
	Oi8vd3d3Lmd1Lm9yZy9wb2xpY3kvAAoJEC1yfMdoaXc0JBIAoIiLlUsvpMDOyGEc
	dADGKXF/Hcb+AKCJWPphZCphduxSvrzH0hgzHdeQaA==
	=nts1
	-----END PGP SIGNATURE-----
	"""

	test_sig2 = b"""-----BEGIN PGP MESSAGE-----

	owGbwMvMwCSoW1RzPCOz3IRxjXQSR0lqcYleSUWJTZOvjVdpcYmCu1+oQmaJIleH
	GwuDIBMDGysTSIqBi1MApi+nlGGuwDeHao53HBr+FoVGP3xX+kvuu9fCMJvl6IOf
	y1kvP4y+8D5a11ang0udywsA
	=Crq6
	-----END PGP MESSAGE-----
	"""

	# A message with a prepended but unsigned plaintext packet.
	double_plaintext_sig = b"""-----BEGIN PGP MESSAGE-----

	rDRiCmZvb2Jhci50eHRF4pxNVGhpcyBpcyBteSBzbmVha3kgcGxhaW50ZXh0IG1l
	c3NhZ2UKowGbwMvMwCSoW1RzPCOz3IRxTWISa6JebnG666MFD1wzSzJSixQ81XMV
	UlITUxTyixRyKxXKE0uSMxQyEosVikvyCwpSU/S4FNCArq6Ce1F+aXJGvoJvYlGF
	erFCTmJxiUJ5flFKMVeHGwuDIBMDGysTyA4GLk4BmO036xgWzMgzt9V85jCtfDFn
	UqVooWlGXHwNw/xg/fVzt9VNbtjtJ/fhUqYo0/LyCGEA
	=6+AK
	-----END PGP MESSAGE-----
	"""

	def check_result(result, summary, validity, fpr, status, notation):
	assert len(result.signatures) == 1, "Unexpected number of signatures"
	sig = result.signatures[0]
	assert sig.summary == summary, \
	"Unexpected signature summary: {}, want: {}".format(sig.summary,
	summary)
	assert sig.fpr == fpr
	assert gpg.errors.GPGMEError(sig.status).getcode() == status

	if notation:
	expected_notations = {
	"bar": (b"\xc3\xb6\xc3\xa4\xc3\xbc\xc3\x9f" +
	b" das waren Umlaute und jetzt ein prozent%-Zeichen"
	if sys.version_info[0] < 3 else
	b"\xc3\xb6\xc3\xa4\xc3\xbc\xc3\x9f".decode() +
	" das waren Umlaute und jetzt ein prozent%-Zeichen"),
	"foobar.1": "this is a notation data with 2 lines",
	None: "http://www.gu.org/policy/",
	}
	assert len(sig.notations) == len(expected_notations)

	for r in sig.notations:
	assert not 'name_len' in dir(r)
	assert not 'value_len' in dir(r)
	assert r.name in expected_notations
	assert r.value == expected_notations[r.name], \
	"Expected {!r}, got {!r}".format(expected_notations[r.name],
	r.value)
	expected_notations.pop(r.name)

	assert len(expected_notations) == 0

	assert not sig.wrong_key_usage
	assert sig.validity == validity, \
	"Unexpected signature validity: {}, want: {}".format(
	sig.validity, validity)
	assert gpg.errors.GPGMEError(sig.validity_reason).getcode() == gpg.errors.NO_ERROR

	c = gpg.Context()
	c.set_armor(True)

	# Checking a valid message.
	text = gpg.Data(test_text1)
	sig = gpg.Data(test_sig1)
	c.op_verify(sig, text, None)
	result = c.op_verify_result()
	check_result(result, gpg.constants.sigsum.VALID \| gpg.constants.sigsum.GREEN,
	gpg.constants.validity.FULL,
	"A0FF4590BB6122EDEF6E3C542D727CC768697734",
	gpg.errors.NO_ERROR, True)


	# Checking a manipulated message.
	text = gpg.Data(test_text1f)
	sig.seek(0, os.SEEK_SET)
	c.op_verify(sig, text, None)
	result = c.op_verify_result()
	check_result(result, gpg.constants.sigsum.RED, gpg.constants.validity.UNKNOWN,
	"2D727CC768697734", gpg.errors.BAD_SIGNATURE, False)

	# Checking a normal signature.
	text = gpg.Data()
	sig = gpg.Data(test_sig2)
	c.op_verify(sig, None, text)
	result = c.op_verify_result()
	check_result(result, gpg.constants.sigsum.VALID \| gpg.constants.sigsum.GREEN,
	gpg.constants.validity.FULL,
	"A0FF4590BB6122EDEF6E3C542D727CC768697734",
	gpg.errors.NO_ERROR, False)

	# Checking an invalid message.
	text = gpg.Data()
	sig = gpg.Data(double_plaintext_sig)
	try:
	c.op_verify(sig, None, text)
	except Exception as e:
	assert type(e) == gpg.errors.GPGMEError
	assert e.getcode() == gpg.errors.BAD_DATA
	else:
	assert False, "Expected an error but got none."


	# Idiomatic interface.
	with gpg.Context(armor=True) as c:
	# Checking a valid message.
	_, result = c.verify(test_text1, test_sig1)
	check_result(result, gpg.constants.sigsum.VALID \| gpg.constants.sigsum.GREEN,
	gpg.constants.validity.FULL,
	"A0FF4590BB6122EDEF6E3C542D727CC768697734",
	gpg.errors.NO_ERROR, True)

	# Checking a manipulated message.
	try:
	c.verify(test_text1f, test_sig1)
	except gpg.errors.BadSignatures as e:
	check_result(e.result, gpg.constants.sigsum.RED,
	gpg.constants.validity.UNKNOWN,
	"2D727CC768697734", gpg.errors.BAD_SIGNATURE, False)
	else:
	assert False, "Expected an error but got none."

	# Checking a normal signature.
	sig = gpg.Data(test_sig2)
	data, result = c.verify(test_sig2)
	check_result(result, gpg.constants.sigsum.VALID \| gpg.constants.sigsum.GREEN,
	gpg.constants.validity.FULL,
	"A0FF4590BB6122EDEF6E3C542D727CC768697734",
	gpg.errors.NO_ERROR, False)
	assert data == test_text1

	# Checking an invalid message.
	try:
	c.verify(double_plaintext_sig)
	except gpg.errors.GPGMEError as e:
	assert e.getcode() == gpg.errors.BAD_DATA
	else:
	assert False, "Expected an error but got none."

	alpha = c.get_key("A0FF4590BB6122EDEF6E3C542D727CC768697734", False)
	bob = c.get_key("D695676BDCEDCC2CDD6152BCFE180B1DA9E3B0B2", False)

	# Checking a valid message.
	c.verify(test_text1, test_sig1, verify=[alpha])

	try:
	c.verify(test_text1, test_sig1, verify=[alpha, bob])
	except gpg.errors.MissingSignatures as e:
	assert len(e.missing) == 1
	assert e.missing[0] == bob
	else:
	assert False, "Expected an error, got none"
	diff --git a/lang/python/tests/t-wait.py b/lang/python/tests/t-wait.py
	index 0c403fa6..31013011 100755
	--- a/lang/python/tests/t-wait.py
	+++ b/lang/python/tests/t-wait.py
	@@ -1,44 +1,45 @@
	#!/usr/bin/env python

	# Copyright (C) 2016 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 time
	import gpg
	import support
	+_ = support # to appease pyflakes.

	c = gpg.Context()
	c.set_armor(True)

	# Checking a message without a signature.
	sig = gpg.Data("foo\n")
	text = gpg.Data()
	c.op_verify_start(sig, None, text)

	try:
	while True:
	err = c.wait(False)
	if err:
	break
	time.sleep(0.1)
	except Exception as e:
	assert e.getcode() == gpg.errors.NO_DATA
	else:
	assert False, "Expected an error, got none"
	diff --git a/lang/python/tests/t-wrapper.py b/lang/python/tests/t-wrapper.py
	index 79f047fa..08a320d2 100755
	--- a/lang/python/tests/t-wrapper.py
	+++ b/lang/python/tests/t-wrapper.py
	@@ -1,25 +1,27 @@
	#!/usr/bin/env python

	# Copyright (C) 2016 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/>.

	import gpg
	+import support
	+_ = support # to appease pyflakes.

	d0 = gpg.Data()
	d0.seek # trigger on-demand-wrapping
	assert d0.seek == d0.seek, "Generated wrapper functions are not cached"
	assert hasattr(gpg.Data, 'seek'), "Generated wrapper functions are not shared"

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