Patient with pain on the upper right area, and the patient cannot tell the tooth causes the pain, what is the best reliable way to do test pulp

Patient with pain on the upper right area, and the patient cannot tell the tooth causes the pain, what is the best reliable way to do test pulp:

1. Thermal test. 

2. Electric test. 

3. Stimulation the dentine.

4. Anesthesia test 

5. Cavity test 

We cant start cavity in all  , thermal test more appropriate