Flask- Loginuser_id在会话中寻找，您可以在测试中使用session_transaction以下命令进行设置：
with app.test_client() as c:
with c.session_transaction() as sess:
sess['user_id'] = 'myuserid'
sess['_fresh'] = True # https://flask-login.readthedocs.org/en/latest/#fresh-logins
resp = c.get('/someurl')
用户对象myuserid的ID在哪里。
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