Workflow for development

After reading through all of the documentation with regard to getting started in developing for elementary OS, I am still a little unclear on how one actually tests their code for bug fixes.

As an example, lets say that someone wishes to fix a few bugs in a Switchboard plug. They pull the trunk and after reviewing the code believe they see the issue and modify it accordingly. They then compile/build it with no issues but now that it is built, how do they add it to their Switchboard for testing it?

It is quite likely I am missing something here and hopefully someone could point me in the right direction so that I can begin helping.

Thanks