Setup CI tests

[zimbatm]

It would be nice if the changes in the plugin could automatically be tested against multiple version of vim.

/cc @hauleth @halostatue

[hauleth]

Will check that out.

[halostatue]

I haven’t set any tests up for CI, but I have used Vader for some of my internal script functions. There are examples in the README. June Gunn has tests in seoul256.vim, gv.vim, vim-after-object, and there’s a wiki page describing it.

[zimbatm]

Sounds good! Even a syntax-level check is already better than nothing.

[zimbatm]

@hauleth @halostatue who wants to take care of this? Having both vim 8.0 and neovim tested with the CI will help us get the other PRs through.

[halostatue]

I’m not likely to have time for a while, but I mentioned this in reply to a comment from another watcher.