How to trigger a pipeline on master when a merge request is raised against master in GitLab CI

The scenario is

I cut a branch from master(default) named Test and make a bunch of commits to it.

I have mentioned in the pipeline file in master to run only on merge requests like shown below

- if: '$CI_PIPELINE_SOURCE == "merge_request_event"'

I also tried like this

- merge_requests


The pipeline on the master branch should get triggered(and not the pipeline in the test branch) when you raise a merge request from Test --> master.

Current behavior

When I raise an MR from Test --> Master, the pipeline code which is in Test is getting executed and not the one in master.

How can we get the expected behavior? Any help would be appreciated.

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