def test_function_timeout_works():
timeout = 0.5
def runner():
time.sleep(timeout * 2)
with pytest.raises(TimeoutError):
run_in_process(target=runner, timeout=timeout)
def test_function_exception_is_reraised():
message = "example message"
def runner():
raise RuntimeError(message)
with pytest.raises(RuntimeError) as exc_info:
run_in_process(target=runner)
assert message == exc_info.value.args[0]
def test_function_detach_works():
def runner(detach_process):
detach_process()
time.sleep(5)
with contained_children():
run_in_process(runner, allow_detach=True)
assert (not multiprocessing.active_children()
), "Multiprocessing should not see active children"
assert active_children(), "Process should still be up"
def test_function_is_executed_in_separate_process():
with isolated_filesystem() as path:
def runner():
pidfile.write_text(str(os.getpid()), encoding="utf-8")
pidfile = Path(path) / "pid.txt"
run_in_process(target=runner)
main_pid = str(os.getpid())
runner_pid = pidfile.read_text(encoding="utf-8")
assert runner_pid, "Runner pid must have been set"
assert main_pid != runner_pid, "Function must have been run in separate process"
def test_function_gets_args():
arg = "123"
def runner(s):
return s
result = run_in_process(target=runner, args=(arg, ))
assert result == arg
def test_function_return_value_is_returned():
value = 123
def runner():
return value
result = run_in_process(target=runner)
assert result == value