This is probably the last contributor that I am going to add to the DacFx deployment contributors project (https://github.com/DacFxDeploymentContributors/Contributors/) for a little while, if anyone else has one they want to contribute please feel free. I have been pretty pleased with how they went but want to make the testing side better.
This is an example contributor that is different to all the others in that the previous contributors enumerated the list of steps and either modified one or swapped it with another but this one uses the context object that is passed in to find all changes to stored procedures and then based on the dacpac and deployment database made a decision about whether to fail the deployment or not: