What are the tests for tendonitis?

Impingement Signs. Multiple tests for shoulder pain issues from things like impingement tests to evaluating the biceps tendon to also evaluating the shoulder labrum etc. A good musculoskeletal specialist should be able to perform these tests on you.
Exam/mri. Some tendonitis can be accurately diagnosed with physical exam. A more certain assessment can be made with an MRI scan.

Related Questions

What are the tests for Achilles tendonitis?

Achilles. There are no specific tests for this unless ruling out a rupture. The physical exam determines the diagnosis. Read more...
Achilles Tendonitis. There are several tests beyond physical examination that include ultrasound and mri. Read more...