[英]Can I handle multiple asserts within a single Python pytest method?
我正在用pytest
编写测试,我遇到了下一个问题:我有一个测试一些变量的测试,然后我执行一些繁重的计算,然后我想执行另一个测试。
问题是 - 如果第一个assert
失败,整个测试失败,并且pystest
不执行第二个测试。 代码:
class TestSomething:
def tests_method(self, some_variables):
# Some actions that take a lot of time!
assert some_var == 1
# Some actions that take a lot of time!
assert some_var == 2
我知道这种测试方法可以分为两种方法,但这里的性能问题至关重要。
有一种方法可以在一种方法中运行2个断言吗?
通常,我只是让第一个断言的测试失败。 但是,如果您真的想要进行多次比较,请比较元组。 这是一个简单的例子:
def foo(x):
return x + 1
def bar(y):
return y - 1
def test_foo():
# some expensive calculation
a = foo(10)
# another expensive calculation
b = bar(10)
assert (a, b) == (10, 9)
当我用pytest运行它时,它显示了两个值:
$ pytest scratch.py
============================= test session starts =============================
platform linux2 -- Python 2.7.12, pytest-3.0.7, py-1.4.33, pluggy-0.4.0
rootdir: /home/don/workspace/scratch, inifile:
collected 1 items
scratch.py F
================================== FAILURES ===================================
__________________________________ test_foo ___________________________________
def test_foo():
# some expensive calculation
a = foo(10)
# another expensive calculation
b = bar(10)
> assert (a, b) == (10, 9)
E assert (11, 9) == (10, 9)
E At index 0 diff: 11 != 10
E Use -v to get the full diff
scratch.py:16: AssertionError
========================== 1 failed in 0.02 seconds ===========================
我也尝试使用and
结合比较,但由于短路 ,这不起作用。 例如,我尝试了这个断言:
assert a == 10 and b == 9
Pytest报告了这次失败:
> assert a == 10 and b == 9
E assert (11 == 10)
除非使用--showlocals
选项,否则它不会报告b
的值。
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