CI: run tests multi-threaded (#2251)

test/__init__.py

@@ -1,3 +1,4 @@
+import pathlib
 import warnings
 
 import settings
@@ -5,3 +6,12 @@ import settings
 warnings.simplefilter("always")
 settings.no_gui = True
 settings.skip_autosave = True
+
+import ModuleUpdate
+
+ModuleUpdate.update_ran = True  # don't upgrade
+
+import Utils
+
+Utils.local_path.cached_path = pathlib.Path(__file__).parent.parent
+Utils.user_path()  # initialize cached_path