代码:

# coding=utf-8
import pytest


def whatever():
    return 9/0

def test_whatever():
    try:
        whatever()
    except ZeroDivisionError as exc:
        pytest.fail(exc, pytrace=True)

输出:

================================ 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 ==============================

如何使pytest打印回溯,所以我将看到在任何函数异常被引发的地方?


当前回答

更好的做法是使用继承unittest的类。TestCase和运行self.assertRaises。

例如:

import unittest


def whatever():
    return 9/0


class TestWhatEver(unittest.TestCase):

    def test_whatever():
        with self.assertRaises(ZeroDivisionError):
            whatever()

然后运行以下命令执行:

pytest -vs test_path

其他回答

只是添加了另一个“愚蠢”的建议,因为我在现有的答案中没有看到它。本质上,你可以初始化一个错误变量为None,在try/except块中做这件事,然后在那之后检查错误变量的类/值

e = None

try:
    blah()
except Exception as exc:
    e = exc

assert e.__class__ == ValueError # or whatever you expect
assert str(e) == "expected message"

在pytest中有两种方法来处理这类情况:

使用pytest。提出了功能 使用pytest.mark.xfail装饰器

如文档所述:

使用pytest。当您在测试自己的代码故意引发的异常时,而使用@pytest.mark时,则可能会更好。带有检查函数的Xfail可能更适合于记录未修复的错误(其中测试描述了“应该”发生什么)或依赖关系中的错误。

pytest.raise的用法:

def whatever():
    return 9/0
def test_whatever():
    with pytest.raises(ZeroDivisionError):
        whatever()

使用pytest.mark.xfail:

@pytest.mark.xfail(raises=ZeroDivisionError)
def test_whatever():
    whatever()

pytest.raise的输出:

============================= 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的输出。xfail标记:

============================= 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=============================

您是否尝试删除“pytrace=True”?

pytest.fail(exc, pytrace=True) # before
pytest.fail(exc) # after

你试过用“——fulltrace”运行吗?

我只是写了一个钩子,每个测试都会得到

诱惑:

@pytest。hookimpl (tryfirst = True, hookwrapper = True) def pytest_runtest_makereport(item: item, call: CallInfo):

    outcome = yield  # The result after the test is completed
    result = outcome.get_result()

    if result.when == "call":
       if result.failed == True:

       else:

我有一个函数,更新一个文档与测试结果,并通过使用:result.longrepr.reprcrash.message添加跟踪

我不知道这是否是最好的方法,但它确实回答了如何仅使用pytest打印回溯的问题

@显然我有一些其他的代码

这个解决方案是我们正在使用的:

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 tested

请参考pytest, https://docs.pytest.org/en/latest/reference.html#pytest-raises