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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)
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 testfixtures.mock import call
from testfixtures import Replacer, ShouldRaise, compare, SequenceComparison
from testfixtures.popen import MockPopen, PopenBehaviour
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:
process = call.Popen(['svn', 'ls', '-R', 'foo'], stderr=PIPE, stdout=PIPE)
compare(Popen.all_calls, expected=[
process,
process.communicate()
])
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(Popen.all_calls, expected=[
process.root_call,
process.root_call.communicate('foo'),
])
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(), expected=b'foo')
compare(process.stderr.read(), expected=b'bar')
def test_write_to_stdin(self):
# setup
Popen = MockPopen()
Popen.set_command('a command')
# usage
process = Popen('a command', stdin=PIPE, shell=True)
process.stdin.write('some text')
process.stdin.close()
# test call list
compare(Popen.all_calls, expected=[
process.root_call,
process.root_call.stdin.write('some text'),
process.root_call.stdin.close(),
])
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, expected=None)
# result checking
compare(process.wait(), expected=3)
compare(process.returncode, expected=3)
# test call list
compare(Popen.all_calls, expected=[
call.Popen('a command'),
call.Popen('a command').wait(),
])
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(Popen.all_calls, expected=[
process.root_call,
process.root_call.send_signal(0),
])
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, expected=3)
compare(Popen.all_calls, expected=[
process.root_call,
process.root_call.poll(),
process.root_call.poll(),
process.root_call.poll(),
])
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:
root_call = call.Popen(['svn', 'ls', '-R', 'foo'],
stderr=PIPE, stdout=PIPE)
compare(Popen.all_calls, expected=[
root_call,
root_call.communicate()
])
def test_multiple_responses(self):
# set up
behaviours = [
PopenBehaviour(stderr=b'e', returncode=1),
PopenBehaviour(stdout=b'o'),
]
def behaviour(command, stdin):
return behaviours.pop(0)
self.Popen.set_command('svn ls -R foo', behaviour=behaviour)
# testing of error:
with ShouldRaise(RuntimeError('something bad happened')):
my_func()
# testing of second call:
compare(my_func(), b'o')
def test_count_down(self):
# set up
self.Popen.set_command('svn ls -R foo', behaviour=CustomBehaviour())
# testing of error:
with ShouldRaise(RuntimeError('something bad happened')):
my_func()
# testing of second call:
compare(my_func(), b'o')
def test_multiple_processes(self):
# set up
self.Popen.set_command('process --batch=0', stdout=b'42')
self.Popen.set_command('process --batch=1', stdout=b'13')
# testing of results
compare(process_in_batches(2), expected=55)
# testing of process management:
p1 = call.Popen('process --batch=0', shell=True, stderr=PIPE, stdout=PIPE)
p2 = call.Popen('process --batch=1', shell=True, stderr=PIPE, stdout=PIPE)
compare(Popen.all_calls, expected=[
p1,
p2,
p1.communicate(),
p2.communicate(),
])
def test_multiple_processes_unordered(self):
# set up
self.Popen.set_command('process --batch=0', stdout=b'42')
self.Popen.set_command('process --batch=1', stdout=b'13')
# testing of results
compare(process_in_batches(2), expected=55)
# testing of process management:
p1 = call.Popen('process --batch=0', shell=True, stderr=PIPE, stdout=PIPE)
p2 = call.Popen('process --batch=1', shell=True, stderr=PIPE, stdout=PIPE)
compare(Popen.all_calls, expected=SequenceComparison(
p2,
p2.communicate(),
p1,
p1.communicate(),
ordered=False
))
class CustomBehaviour(object):
def __init__(self, fail_count=1):
self.fail_count = fail_count
def __call__(self, command, stdin):
while self.fail_count > 0:
self.fail_count -= 1
return PopenBehaviour(stderr=b'e', returncode=1)
return PopenBehaviour(stdout=b'o')
def process_in_batches(n):
processes = []
for i in range(n):
processes.append(Popen('process --batch='+str(i),
stdout=PIPE, stderr=PIPE, shell=True))
total = 0
for process in processes:
out, err = process.communicate()
total += int(out)
return total
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