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# NB: This file is used in the documentation, if you make changes, ensure
# you update the line numbers in popen.txt!
from subprocess import Popen, PIPE
def my_func():
process = Popen('svn ls -R foo', stdout=PIPE, stderr=PIPE, shell=True)
out, err = process.communicate()
if process.returncode:
raise RuntimeError('something bad happened')
return out
dotted_path = 'testfixtures.tests.test_popen_docs.Popen'
from unittest import TestCase
from mock import call
from testfixtures import Replacer, ShouldRaise, compare
from testfixtures.popen import MockPopen
class TestMyFunc(TestCase):
def setUp(self):
self.Popen = MockPopen()
self.r = Replacer()
self.r.replace(dotted_path, self.Popen)
self.addCleanup(self.r.restore)
def test_example(self):
# set up
self.Popen.set_command('svn ls -R foo', stdout=b'o', stderr=b'e')
# testing of results
compare(my_func(), b'o')
# testing calls were in the right order and with the correct parameters:
compare([
call.Popen('svn ls -R foo',
shell=True, stderr=PIPE, stdout=PIPE),
call.Popen_instance.communicate()
], Popen.mock.method_calls)
def test_example_bad_returncode(self):
# set up
Popen.set_command('svn ls -R foo', stdout=b'o', stderr=b'e',
returncode=1)
# testing of error
with ShouldRaise(RuntimeError('something bad happened')):
my_func()
def test_communicate_with_input(self):
# setup
Popen = MockPopen()
Popen.set_command('a command')
# usage
process = Popen('a command', stdout=PIPE, stderr=PIPE, shell=True)
out, err = process.communicate('foo')
# test call list
compare([
call.Popen('a command', shell=True, stderr=-1, stdout=-1),
call.Popen_instance.communicate('foo'),
], Popen.mock.method_calls)
def test_read_from_stdout_and_stderr(self):
# setup
Popen = MockPopen()
Popen.set_command('a command', stdout=b'foo', stderr=b'bar')
# usage
process = Popen('a command', stdout=PIPE, stderr=PIPE, shell=True)
compare(process.stdout.read(), b'foo')
compare(process.stderr.read(), b'bar')
# test call list
compare([
call.Popen('a command', shell=True, stderr=PIPE, stdout=PIPE),
], Popen.mock.method_calls)
def test_wait_and_return_code(self):
# setup
Popen = MockPopen()
Popen.set_command('a command', returncode=3)
# usage
process = Popen('a command')
compare(process.returncode, None)
# result checking
compare(process.wait(), 3)
compare(process.returncode, 3)
# test call list
compare([
call.Popen('a command'),
call.Popen_instance.wait(),
], Popen.mock.method_calls)
def test_send_signal(self):
# setup
Popen = MockPopen()
Popen.set_command('a command')
# usage
process = Popen('a command', stdout=PIPE, stderr=PIPE, shell=True)
process.send_signal(0)
# result checking
compare([
call.Popen('a command', shell=True, stderr=-1, stdout=-1),
call.Popen_instance.send_signal(0),
], Popen.mock.method_calls)
def test_poll_until_result(self):
# setup
Popen = MockPopen()
Popen.set_command('a command', returncode=3, poll_count=2)
# example usage
process = Popen('a command')
while process.poll() is None:
# you'd probably have a sleep here, or go off and
# do some other work.
pass
# result checking
compare(process.returncode, 3)
compare([
call.Popen('a command'),
call.Popen_instance.poll(),
call.Popen_instance.poll(),
call.Popen_instance.poll(),
], Popen.mock.method_calls)
def test_default_behaviour(self):
# set up
self.Popen.set_default(stdout=b'o', stderr=b'e')
# testing of results
compare(my_func(), b'o')
# testing calls were in the right order and with the correct parameters:
compare([
call.Popen('svn ls -R foo',
shell=True, stderr=PIPE, stdout=PIPE),
call.Popen_instance.communicate()
], Popen.mock.method_calls)