pytest无法查看正在测试的函数的日志

from flask import Flask
import logging

app = Flask(__name__)

@app.route('/')
def catch_all():
    logging.warning("I'm a warning")
    return "This is a REST API"

if __name__ == '__main__':
    app.run(host='0.0.0.0', port=8080, debug=True)

当我运行它时,我会在日志中看到警告

WARNING:root:I'm a warning

然后我创建一个测试,如下所示

import fulfillment

def test_index():
    fulfillment.app.testing = True
    client = fulfillment.app.test_client()

    r = client.get('/')
    assert r.status_code == 200
    assert 'This is a REST API' in r.data.decode('utf-8')

当我使用 pytest How can I see normal print output created during pytest run? ,听起来很相似,但是 pytest -s 选项不起作用,我认为它实际上是指测试函数的输出,而不是被测试函数的输出。

如何查看被测函数的日志?