我有一个简单的代码库,如下所示:
import threading
import time
class Demo:
def __init__(self):
self._run_thread = False
def start(self):
if not self._run_thread:
print("Thread has not run")
threading.Thread(target=self.counter, args=(20, )).start()
return 20
else:
print("Thread has run")
return None
def counter(self, value):
self._run_thread = True
for i in range(value):
print(f"Inside counter with value {i}")
time.sleep(3)
if __name__ == "__main__":
d = Demo()
d.start()
d.start()
第一次start
调用函数时,线程将运行,而下一次调用它时不会因为设置了 flag(_run_thread)。
代码本身运行得很好。
但是,当我尝试对此代码运行测试时,它无法按预期工作。下面是我的测试代码:
import app
def dummy_counter(self, value):
self._run_thread = True
def test_app_start_function_runs_well(mocker):
d = app.Demo()
mocker.patch.object(
d,
"counter",
dummy_counter
)
d.start()
result = d.start()
assert result is None
因此,由于我实际上不希望循环,因此我只想模拟该counter
函数,然后在其中设置标志,以便实际线程不会运行。
我看到以下错误。
(roughwork) ➜ threads git:(master) ✗ pytest
============================================================ test session starts ============================================================
platform linux -- Python 3.7.6, pytest-5.4.3, py-1.8.1, pluggy-0.13.1
rootdir: /home/subhayan/Codes/Test/Python-remote/threads
plugins: mock-3.1.1
collected 1 item
test_app.py Exception in thread Thread-2:
Traceback (most recent call last):
File "/home/subhayan/anaconda3/envs/roughwork/lib/python3.7/threading.py", line 926, in _bootstrap_inner
self.run()
File "/home/subhayan/anaconda3/envs/roughwork/lib/python3.7/threading.py", line 870, in run
self._target(*self._args, **self._kwargs)
TypeError: dummy_counter() missing 1 required positional argument: 'value'
F [100%]
================================================================= FAILURES ==================================================================
____________________________________________________________ test_app_runs_well _____________________________________________________________
mocker = <pytest_mock.plugin.MockFixture object at 0x7f922c05ee90>
def test_app_runs_well(mocker):
d = app.Demo()
mocker.patch.object(
d,
"counter",
dummy_counter
)
d.start()
result = d.start()
> assert result is None
E assert 20 is None
test_app.py:15: AssertionError
----------------------------------------------------------- Captured stdout call ------------------------------------------------------------
Thread has not run
Thread has not run
----------------------------------------------------------- Captured stderr call ------------------------------------------------------------
Exception in thread Thread-1:
Traceback (most recent call last):
File "/home/subhayan/anaconda3/envs/roughwork/lib/python3.7/threading.py", line 926, in _bootstrap_inner
self.run()
File "/home/subhayan/anaconda3/envs/roughwork/lib/python3.7/threading.py", line 870, in run
self._target(*self._args, **self._kwargs)
TypeError: dummy_counter() missing 1 required positional argument: 'value'
========================================================== short test summary info ==========================================================
FAILED test_app.py::test_app_runs_well - assert 20 is None
我不知道我哪里出错了。任何线索,我将不胜感激。