Does python unittest framework test runner run in a separate thread?

I am trying to figure out the order in which Python unittest framework executes, as I need to know in order to get tests for a multithreaded application to pass correctly. Does the test runner, (which calls all functions labelled test_*) run in a separate thread?

If not, what is the order in which the program executes? I know setup() is called first, is the first function named test_* called immediately after? Or is there something else in between?