암호:
# coding=utf-8
import pytest
def whatever():
return 9/0
def test_whatever():
try:
whatever()
except ZeroDivisionError as exc:
pytest.fail(exc, pytrace=True)산출:
================================ test session starts =================================
platform linux2 -- Python 2.7.3 -- py-1.4.20 -- pytest-2.5.2
plugins: django, cov
collected 1 items
pytest_test.py F
====================================== FAILURES ======================================
___________________________________ test_whatever ____________________________________
def test_whatever():
try:
whatever()
except ZeroDivisionError as exc:
> pytest.fail(exc, pytrace=True)
E Failed: integer division or modulo by zero
pytest_test.py:12: Failed
============================== 1 failed in 1.16 seconds ==============================pytest print traceback을 만드는 방법, whatever함수에서 예외가 발생한 위치를 볼 수 있습니까?
답변
pytest.raises(Exception) 당신이 필요한 것입니다.
암호
import pytest
def test_passes():
with pytest.raises(Exception) as e_info:
x = 1 / 0
def test_passes_without_info():
with pytest.raises(Exception):
x = 1 / 0
def test_fails():
with pytest.raises(Exception) as e_info:
x = 1 / 1
def test_fails_without_info():
with pytest.raises(Exception):
x = 1 / 1
# Don't do this. Assertions are caught as exceptions.
def test_passes_but_should_not():
try:
x = 1 / 1
assert False
except Exception:
assert True
# Even if the appropriate exception is caught, it is bad style,
# because the test result is less informative
# than it would be with pytest.raises(e)
# (it just says pass or fail.)
def test_passes_but_bad_style():
try:
x = 1 / 0
assert False
except ZeroDivisionError:
assert True
def test_fails_but_bad_style():
try:
x = 1 / 1
assert False
except ZeroDivisionError:
assert True산출
============================================================================================= test session starts ==============================================================================================
platform linux2 -- Python 2.7.6 -- py-1.4.26 -- pytest-2.6.4
collected 7 items
test.py ..FF..F
=================================================================================================== FAILURES ===================================================================================================
__________________________________________________________________________________________________ test_fails __________________________________________________________________________________________________
def test_fails():
with pytest.raises(Exception) as e_info:
> x = 1 / 1
E Failed: DID NOT RAISE
test.py:13: Failed
___________________________________________________________________________________________ test_fails_without_info ____________________________________________________________________________________________
def test_fails_without_info():
with pytest.raises(Exception):
> x = 1 / 1
E Failed: DID NOT RAISE
test.py:17: Failed
___________________________________________________________________________________________ test_fails_but_bad_style ___________________________________________________________________________________________
def test_fails_but_bad_style():
try:
x = 1 / 1
> assert False
E assert False
test.py:43: AssertionError
====================================================================================== 3 failed, 4 passed in 0.02 seconds ======================================================================================e_info예외 개체 를 저장하여 세부 정보를 추출 할 수 있습니다. 예를 들어 예외 호출 스택 또는 다른 중첩 예외를 확인하려는 경우.
답변
다음과 같은 의미입니까?
def test_raises():
with pytest.raises(Exception) as execinfo:
raise Exception('some info')
# these asserts are identical; you can use either one
assert execinfo.value.args[0] == 'some info'
assert str(execinfo.value) == 'some info'답변
pytest에서 이러한 종류의 사례를 처리하는 두 가지 방법이 있습니다.
-
pytest.raises기능 사용 -
pytest.mark.xfail데코레이터 사용하기
사용법 pytest.raises:
def whatever():
return 9/0
def test_whatever():
with pytest.raises(ZeroDivisionError):
whatever()사용법 pytest.mark.xfail:
@pytest.mark.xfail(raises=ZeroDivisionError)
def test_whatever():
whatever()출력 pytest.raises:
============================= test session starts ============================
platform linux2 -- Python 2.7.10, pytest-3.2.3, py-1.4.34, pluggy-0.4.0 --
/usr/local/python_2.7_10/bin/python
cachedir: .cache
rootdir: /home/user, inifile:
collected 1 item
test_fun.py::test_whatever PASSED
======================== 1 passed in 0.01 seconds =============================pytest.xfail마커 출력 :
============================= test session starts ============================
platform linux2 -- Python 2.7.10, pytest-3.2.3, py-1.4.34, pluggy-0.4.0 --
/usr/local/python_2.7_10/bin/python
cachedir: .cache
rootdir: /home/user, inifile:
collected 1 item
test_fun.py::test_whatever xfail
======================== 1 xfailed in 0.03 seconds=============================현상태대로 설명서를 말한다 :
pytest.raises예외를 테스트하는 경우 의도적으로 자체 코드에서 의도적으로 발생하는 예외에 대해 사용 하는 것이 좋을 수도 있지만@pytest.mark.xfail, 검사 기능과 함께 사용 하면 수정되지 않은 버그 (테스트에서 “어떻게 발생해야 하는지를 설명하는”) 또는 종속성의 버그를 문서화하는 것과 같은 경우에 더 좋습니다. .
답변
당신은 시도 할 수 있습니다
def test_exception():
with pytest.raises(Exception) as excinfo:
function_that_raises_exception()
assert str(excinfo.value) == 'some info' 답변
pytest는 끊임없이 발전하고 최근의 멋진 변화 중 하나를 통해 동시에 테스트 할 수 있습니다
- 예외 유형 (엄격한 테스트)
- 오류 메시지 (정규 표현식을 사용하여 엄격하거나 느슨하게 검사)
설명서의 두 가지 예 :
with pytest.raises(ValueError, match='must be 0 or None'):
raise ValueError('value must be 0 or None')with pytest.raises(ValueError, match=r'must be \d+$'):
raise ValueError('value must be 42')나는 많은 프로젝트에서 그 접근법을 사용하고 있으며 매우 좋아합니다.
답변
올바른 방법을 사용하고 pytest.raises있지만 여기 주석에서 흥미로운 대안을 찾았 으며이 질문을 읽는 독자를 위해 저장하고 싶습니다.
try:
thing_that_rasises_typeerror()
assert False
except TypeError:
assert True답변
이 솔루션은 우리가 사용하는 것입니다.
def test_date_invalidformat():
"""
Test if input incorrect data will raises ValueError exception
"""
date = "06/21/2018 00:00:00"
with pytest.raises(ValueError):
app.func(date) #my function to be testedpytest, https://docs.pytest.org/en/latest/reference.html#pytest-raises를 참조하십시오
