I use Vim for Javascript development. I use Mocha for testing my Javascript.
I don't run Mocha tests from inside Vim. I use a separate terminal which automatically re-runs my tests when files change. If you run your tests directly inside Vim this isn't the plugin for you. Check out vim-mocha-special-blend which is probably more up your alley.
I wanted a way to quickly run only certain tests, but without actually running the tests in Vim. Here's a simple plugin to help do that by automatically adding .only to the test under your cursor.
I use vim-plug:
Plug 'gerrard00/vim-mocha-only', { 'for': ['javascript'] }
The plugin adds three commands:
:MochaOnlyAdd changes describe to describe.only or it to it.only. It also removes any other .only statements in the same buffer.
:MochaOnlyRemove changes describe.only to describe and it.only to it.
:MochaOnlyToggle calls add or remove as appropriate.
All three commands require that your cursor is placed on the line where the test function is declared.
I personally use toggle most of the time, so I added a mapping to my .vimrc file:
nnoremap <Leader>mo :MochaOnlyToggle<CR>
That way I can just do \mo to toggle away.