Pytest

正文

 An important point: as well as making sure our code is returning correct answers, we also need to ensure the tests themselves are also correct.

a good rule is to make tests simple enough

============================================== test session starts =================================
platform darwin -- Python 3.11.4, pytest-7.4.3, pluggy-1.3.0
rootdir: /Users/alex/work/SSI/training/lessons/python-intermediate-inflammation
plugins: anyio-4.0.0
collected 2 items

tests/test_models.py ..                                                                       [100%]

=============================================== 2 passed in 0.79s ==================================

Pytest looks for functions whose names also start with the letters ‘test_’ and runs each one. Notice the .. after our test script:

• If the function completes without an assertion being triggered, we count the test as a success (indicated as .).
• If an assertion fails, or we encounter an error, we count the test as a failure (indicated as F). The error is included in the output so we can see what went wrong.

有些输入本来就应该触发异常，因此“抛出异常”也可以是正确行为。

代码如下：

import pytest
from inflammation.models import daily_min

def test_daily_min_string():
    """Test for TypeError when passing strings"""

    with pytest.raises(TypeError):
        daily_min([['Hello', 'there'], ['General', 'Kenobi']])

pytest.raises 的含义

with pytest.raises(TypeError):
    daily_min(...)

含义是：

执行 with 代码块中的代码，并期待它抛出 TypeError。

结果分三种情况：