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

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?

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"

你的意思是这样的吗?

def test_raises():
    with pytest.raises(Exception) as exc_info:   
        raise Exception('some info')
    # these asserts are identical; you can use either one   
    assert exc_info.value.args[0] == 'some info'
    assert str(exc_info.value) == 'some info'

正确的方法是使用pytest。但我在这里的评论中找到了另一种有趣的方法,我想把它留给未来的读者:

try:
    thing_that_rasises_typeerror()
    assert False
except TypeError:
    assert True

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

如果你想测试特定的错误类型,可以使用try, catch和raise的组合:

#-- test for TypeError
try:
  myList.append_number("a")
  assert False
except TypeError: pass
except: assert False