Based on our team's discussion, it'd be nice to move our test builders to where the actual builders are implemented. We would have a base fake builder class that is inherited by other fake builders that represent an actual build system. We would have to update the tests to be configured to use these new fake builder classes and we would have to update the conditionals that evaluate which build system we are using to determine if an action should take place (e.g. get_reusable_component checks if the builder is "koji").