Python pytest 中的 assertTrue() 来断言空列表
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assertTrue() in pytest to assert empty lists
提问by cool77
Is there a way to use assertTrue()or assertFalse()like a function in pytest for python unittests?
I have a function which returns a list of elements. If the list is empty the test needs to fail through assertion.
有没有办法在 pytest 中使用assertTrue()或assertFalse()喜欢 python 单元测试中的函数？我有一个返回元素列表的函数。如果列表为空，则测试需要通过断言失败。
Is there anything like below:
有没有像下面这样的：
assertFalse(function_returns_list()), "the list is non empty, contains error elements"
回答by Anton Strogonoff
Why not test for the length of the list:
为什么不测试列表的长度：
assert len(function_returns_list()) == 0, "the list is non empty"
回答by sashk
You can assert listto confirm list is not empty, or assert not listto confirm list is empty:
您可以assert list确认列表不为空，或者assert not list确认列表为空：
>>> assert not []
>>> assert []
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
AssertionError
>>> assert [1, 2, 3]
So in your case, you can just write down:
所以在你的情况下，你可以写下：
assert not function_returns_list()
You can read more about Truth Value Testingon python.org.
您可以在 python.org 上阅读有关真值测试的更多信息。
