test coverage, missing usage hints with tests or documentation

[matu3ba]

As of now there is no test coverage, ie with luacov.

Further I noticed the following files have no test coverage and neither documentation in the README:

1. benchmark
2. bit
3. fun, functional and operators
4. debug_utils
5. log
6. debug_utils
7. reload

[Conni2461]

I wanted to set it up some time ago: #71 (comment)

We could add actual support for plenary.busted. To make the setup for other plugin devs easier.
Thinking about it

[Conni2461]

Also i dont think we need to mention every module in the README. We should setup tree-sitter-lua docgen for plenary as well and just generate vimdoc.

Btw bit just exists because it doesnt exist in lua5.1

plenary.nvim/lua/plenary/bit.lua

Lines 1 to 2 in 6bb0e09

	-- Shortcircuit to returning bit if it already exists
	if bit then return bit end

[EricDriussi]

I'm a plugin author and would love to get a test coverage report on my plugins but had no luck using lcov (not really a lua programmer TBH).
Is there a quick and dirty way to get this information with or without plenary? Given how long its been I'm guessing this won't really get implemented 😢