Is there a properly tested alternative to Select2 or Chosen?

Selectize.js is a select2 alternative I've been working on that has a suite of tests using a combination of testem, syn, mocha, and chai. Right now there are the following classes of tests:

• Interaction
  Functional tests that makes sure the control behaves as if the user is using it (using syn).
• Setup
  Ensures the control can be initialized properly from existing <select> and <input> elements.
• API
  Tests core API methods for proper functionality.
• Events
  Ensures built-in events get fired at the right times with the proper arguments.
• XSS
  Tests a handful of potential exploits.

With that said, the tests aren't as expansive as I want them to be, but it's getting there :)

Another possible alternative is bootstrap-multiselect

"JQuery multiselect plugin based on Twitter Bootstrap"

Examples and documentation: http://davidstutz.github.io/bootstrap-multiselect/

• The repository does not contain any automated tests, manual tests instead
• Themed using Bootstrap 3
• JavaScript source code is short: 800 lines of code
• 524 stars on GitHub (as of 2013/12/13)

Note: I'm no longer maintaining this project. Choose another one.

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Bselect, which I develop, is tested, however doesn't include all the features (yet) from Select2/Chosen.

If you want, join me in its development :)