How to check function usage when testing?

Question

GitLab

Good afternoon.
Learning to use GitLab CI.
Please tell me how you can implement a function usage check (for example, GetMessage - Bitrix), and if it is used in the code, then give an error?
Or tell me where to google?
Thanks

Answer 1

Judging by the description of the task, it is for something like SonarQube and a custom rule