syncing javascript files from main project to test project in visual stuido

I have a main website project that has typescript files but I also created another project for my javascript unit testing. The problem I am having is that I need to include the js file from my main project in my test project for my unit tests to run.

Problem is when I include the js files there no way to keep them in sync unless everytime I make a change to main I have to manually copy the js file to the test project.

Is there an easier way to do this?