Increase test coverage in single.just and nested.just

[blmalone]

As discussed in this thread: #640 (comment) - we should have more test coverage for various commands that are available to be executed in single.just and nested.just.

Yes I think so. I think maybe we still have a blind spot in end to end testing which is making sure all commands in both single.just and nested.just work as expected. simulate-all-templates covers only the simulate commands for both single.just and nested.just.