[英]Is there a way to skip pytest if fixture setup or teardown fails?
如果夾具的任何部分拋出異常,有沒有辦法跳過測試? 我正在使用第三方夾具,該夾具在拆卸過程中會隨機出錯,因此我試圖包裝我的測試,以便在拋出隨機錯誤時(注意:測試沒有失敗,夾具出錯了) , pytest
只是跳過測試。
這是一個最小的可重現示例:
import functools
import numpy as np
import pytest
def handle_fixture_errors(f):
"""decorator for wrapping test function in try/catch"""
@functools.wraps(f)
def wrapper(*args, **kwargs):
try:
print('about to run my test')
return f(*args, **kwargs)
print('never reached')
except Exception as e:
msg = 'Ignoring fixture exception ' + str(e)
pytest.skip(msg)
return wrapper
@pytest.fixture()
def failing_fixture(request):
"""fixture fails on teardown"""
x = np.linspace(10, 20, 100)
y = np.random.normal(size=(1000, 5))
def teardown():
print('fixture teardown is failing')
z = x.T.dot(y)
request.addfinalizer(teardown)
return x
@handle_fixture_errors
def test_matmul(failing_fixture):
"""original test function"""
print('hey this is my test')
k = failing_fixture
assert len(k) == 100
問題是測試本身沒有拋出異常,它是拋出異常的夾具,所以try/catch
沒有捕獲測試的異常並阻止“.E”產生測試摘要。 我的測試 output 仍然看起來像這樣:
========================================================= ERRORS =========================================================
____________________________________________ ERROR at teardown of test_matmul ____________________________________________
def teardown():
print('fixture teardown is failing')
> z = x.T.dot(y)
E ValueError: shapes (100,) and (1000,5) not aligned: 100 (dim 0) != 1000 (dim 0)
test_fake.py:25: ValueError
-------------------------------------------------- Captured stdout call --------------------------------------------------
about to run my test
hey this is my test
------------------------------------------------ Captured stdout teardown ------------------------------------------------
fixture teardown is failing
================================================ short test summary info =================================================
ERROR test_fake.py::test_matmul - ValueError: shapes (100,) and (1000,5) not aligned: 100 (dim 0) != 1000 (dim 0)
=============================================== 1 passed, 1 error in 0.18s ===============================================
我不想跳過設置或拆除夾具,我只想讓測試被完全“跳過”(或至少,靜音或pass
)。 謝謝你的幫助!
我認為跳過這樣的測試是不合理的。 要么你想要,要么你不想要!
如果你有間歇性測試(或者在這種情況下是固定裝置),考慮重新運行它們,也許在短暫的延遲或一些檢查之后(網絡流量太高?在非高峰時間再試一次)
pytest 為此建議了一些看起來高質量的插件,並且可以在運行之間添加延遲等
https://docs.pytest.org/en/stable/flaky.html#plugins
如果您確切知道哪里會失敗,請考慮在您的代碼放棄或將控制權交還給 pytest 之前自行重試幾次,方法是在某個循環中設計您的邏輯
for _ in range(10): # attempt call 10 times
time.sleep(10) # yuck
try:
foo = flakey_call()
except Exception:
continue # failed: try again, consider different waits
if hasattr(foo, "bar"):
break # successfully got a valid foo
else: # did not find and break
raise Exception("the foo had no bar!")
也可以選擇模擬第 3 方夾具(我會提醒您不要這樣做,因為它可能導致夾具永遠無法工作),或每次運行
設計一些邏輯來獲得第 3 方邏輯的響應,可能會在夾具中重新運行它,直到它執行您想要的操作。
然后要么
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