Areas in need of tests

[ten3roberts]

These are the recent areas I've found to be error prone and prime candidates for initial testing

The end goal is for everything to be tested, but it is worthwhile to start somewhere

• commit buffer
• adding and removing remotes
• Cherry picking + multiple commits

Another consideration regarding testing is if neogit should be tested against git itself, or if the commands should be mocked and we check that is runs the right commands. This is definitely simpler to setup, but may miss many errors regarding e.g how git returns diff, and would miss a previous command influencing the state in an odd way for the next command.

Git is essentially a large global state