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# Copyright (C) 2015 Codethink Limited
#
# This program 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; version 2 of the License.
#
# This program 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 General Public License for more details.
#
# You should have received a copy of the GNU General Public License along
# with this program. If not, see <http://www.gnu.org/licenses/>.
'''Unit tests for some utility code.'''
import os
import tempfile
import threading
import sandboxlib
def duplicate_and_assert_data(read_fd, expected_data):
'''Helper to test the utils.duplicate_streams() method.'''
with tempfile.TemporaryFile() as f_1:
with tempfile.TemporaryFile() as f_2:
sandboxlib.utils.duplicate_streams({read_fd: [f_1, f_2]})
f_1.seek(0)
assert f_1.read() == expected_data
f_2.seek(0)
assert f_2.read() == expected_data
def write_data_in_thread(write_fd, data):
'''Helper to test the utils.duplicate_streams() method.
Since the utils.duplicate_streams() function blocks the main loop until
all data is transferred, we need to write test data in a separate thread.
'''
def write_data(write_fd):
write_f = os.fdopen(write_fd, 'wb')
write_f.write(data)
write_f.close()
write_thread = threading.Thread(target=write_data, args=[write_fd])
write_thread.run()
class TestDuplicateStreams(object):
def test_basic(self):
'''Write data through a pipe into two files at once.'''
data = b'Hello\n'
read_fd, write_fd = os.pipe()
write_data_in_thread(write_fd, data)
duplicate_and_assert_data(read_fd, expected_data=data)
os.close(read_fd)
def test_binary(self):
'''Ensure that the code can handle arbitrary binary data.
It is a common mistake to make to assume data being processed is valid
UTF-8. POSIX streams don't enforce any kind of character encoding.
'''
data = bytearray(range(0,255))
read_fd, write_fd = os.pipe()
write_data_in_thread(write_fd, data)
duplicate_and_assert_data(read_fd, expected_data=data)
os.close(read_fd)
# Ideas for tests:
# non-utf8
# pause without sending EOF.
# send two streams to one file (stdout and stderr) and ensure ordering is OK.
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