Postman tests are written in Javascript. Postman expects the special tests object to be populated with a description an the result of the test. Postman renders the results in the "Tests" tab as well as in the Collection runner, depending on the boolean values present in this dictionary.
Ref: How to write automated tests for APIs using Postman – Part 1
Progress: Postman API Requests --> Save in Collection --> Executing in Runner --> Result Summary.
collection runner settings
results
