Go to Setup and search with the inbound keyword:
Then select Inbound Change Sets and click a Change Set name to see its details:
There are three options: Validate, Deploy, and Delete. Click on Validate to validate a Change Set without deploying changes.
There are four options for validating a Change Set:
- Default
- Run local tests
- Run all tests
- Run specified tests
These options are shown in the following screenshot:
Salesforce recommends that you select the Run Specified Tests