Per #357, you can use the --no-window Godot command line option to hide the Godot window when running tests. You can also add this option to the "Additional Options" in the VSCode GUT Extension. This should be documented somewhere so it's easier to find by others. There are also some considerations to make when using it.

• The "should exit" option should be specified, otherwise you have to break out at the end of the run. If the option is detectable then GUT should take appropriate action and exit.
• Calls to pause_before_teardown will cause the tests to hang since you won't be able to see the screen to click "continue". Again, if the option is detectable GUT can take the right action here.
• You should specify the "ignore pause" option per the previous point.
• You of course cannot watch your tests run.