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