Why I got tornado.autoreload started more than once in testing?

Question

I use tornado.testing to implement my tornado handlers' unit test. The tests seems to be working. But I got below error for every test function.

[W 141027 19:13:25 autoreload:117] tornado.autoreload started more than once in the same process

Does it matters? How can I stop it?

Answer 1

It won't hurt anything, but the warning means you are probably passing debug=True to each Application you create in your tests. You probably don't want to use debug mode in tests (and if you do you can pass autoreload=False to turn this off, or use some of the other options to only turn on the parts of debug mode that you need.