js-test.el is an elisp package which sits on top of js2-mode and js-comint.el and parses your javascript to let you call a pure javascript unit-testing library, such as simpletest.js to automagically test your code as you write it.
For example, put js-comint.el in your load-path, and then add the following lines to your .emacs:
(require 'js-comint) (setq inferior-js-program-command "/usr/bin/java org.mozilla.javascript.tools.shell.Main") (add-hook 'js2-mode-hook '(lambda () (local-set-key "\C-x\C-e" 'js-send-last-sexp) (local-set-key "\C-\M-x" 'js-send-last-sexp-and-go) (local-set-key "\C-cb" 'js-send-buffer) (local-set-key "\C-c\C-b" 'js-send-buffer-and-go) (local-set-key "\C-cl" 'js-load-file-and-go) ))You can then try out any piece of javascript code in a javascript interpreter by simply typing C-x C-e at the end of the sexp. js-comint will use js2-mode to find the last sexp, run Rhino, and load the sexp it just found into the interpreter. This, it turns out, is extremely useful, particularly when you're writing non-domish, algorithmic javascript.