How to share unit test between other projects in the solution?

My sincere apologies, if am duplicating the question here. I have set of tests that need to shared among 3 other projects and my application is web paged

I am considering google as an example:

• Shared Project Tests: Login to google
• Google Drive Project: Add, Upload Tests
• Google Mail Project - Compose, Read, Unread Tests
• Google Maps Project - Search Location Tests

Output:

All the projects should have google login test added part of the test suite.

Thanks for your answers