Python单元测试pytest捕获日志输出

使用pytest进行单元测试时,遇到了需要测试日志输出的情况,查看了文档

https://docs.pytest.org/en/latest/how-to/capture-stdout-stderr.html

https://docs.pytest.org/en/latest/how-to/logging.html

然后试了一下,捕捉logger.info可以用caplog,获取print输出可用capsys,Demo如下:

python 复制代码
import logging

logger = logging.getLogger(__name__)
LOG_INFO = "I'm a teapot"
PRINT_MSG = "No thing to do."


def function_with_logger(msg=None):
    if msg is None:
        msg = LOG_INFO
    logger.info(msg)


def function_include_print():
    print(PRINT_MSG)
  • test_a.py
python 复制代码
import logging

from a import LOG_INFO, PRINT_MSG, function_include_print, function_with_logger


def test_logger(caplog):
    caplog.set_level(logging.INFO)
    function_with_logger()
    log_messages = [record.message for record in caplog.records]
    assert LOG_INFO in log_messages
    caplog.clear()
    function_with_logger("foo")
    assert "foo" in caplog.text


def test_print(capsys):
    function_include_print()
    captured = capsys.readouterr()
    assert PRINT_MSG in captured.out
  • 验证:
bash 复制代码
pytest test_a.py
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