I just learned about checkdoc, and it should probably be mentioned too.

On Thu, Mar 5, 2015 at 3:02 AM, Samer Masterson <samer@samertm.com> 
wrote:
> Hey list,
> 
> As a new contributor, I have no idea how to run or write tests for 
> Emacs, which means I end up testing my patches manually and miss 
> bugs. I could try to learn how Emacs uses tests on my own, but it 
> would benefit future new contributors if we added a section on 
> testing to CONTRIBUTE.
> 
> Here is what I would want to see:
>  - How to write tests, with a pointer to an internal Emacs package 
> that has idiomatic and comprehensive tests.
>  - How to run tests on the entire tree and on individual files.
>  - A pointer to an info page on the testing framework/pattern that 
> most internal Emacs packages use.
> 
> Would anyone be interested in working on this? cc'ing Stephen Leake 
> because he lead the most recent major changes to CONTRIBUTE.
> 
> -samer