Is there a specialized test that may confirm rls?

Clinical diagnosis. Rls is a clinical diagnosis and no special tests are needed per se. There are some genetic tests if you're concerned about family line or not sure but these are usually not needed.
No. If these are all true for you, you have rls: 1. A desire to move the limbs usually associated with discomfort or disagreeable sensations in the limbs; 2. You move to relieve the discomfort or to provide a counter-stimulus to relieve the discomfort; 3. Your symptoms are worse at rest with at least temporary relief by activity; 4. Your symptoms are worse later in the day or at night. No tests needed.