Use Adaptavist for Bitbucket Server merge check to see if all commits from branch are in another

[Richard W]

I am wondering if there is a way to use Adaptavist Script runner for Bitbucket server to see if all commits from one branch are in another branch. For example, consider the following branches.

- master

- development

- feature/1234-abc- feature

I would like to check if the commits from feature/1234-abc feature are in development prior to the merge into master from feature/1234-abc. I know that I can find the to branch using this 

mergeRequest.pullRequest.toRef.displayId == "master"

But I couldn't figure out how to compare the commits, I was trying to rework the example of merge commits detected on feature branch, but was unsuccessful.