AssemblyTest: Introduce assembly test module

src/Mod/Assembly/TestAssemblyWorkbench.py

@@ -26,6 +26,5 @@ import TestApp
 from AssemblyTests.TestCore import TestCore
 
 
-# dummy usage to get flake8 and lgtm quiet
-False if TestCore.__name__ else True
-False if TestApp.__name__ else True
+# Use the modules so that code checkers don't complain (flake8)
+True if TestCore else False