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Filename :
test_popen_docs.py
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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