MochaRails integrates the Mocha JavaScript test framework with the Rails (>= 3.1) Asset Pipeline.
MochaRails is a mountable Rails engine that serves a browser-based Mocha test suite, along with your development JavaScript files, via the Asset Pipeline.
It loads Chai for assertions, although since Mocha is decoupled from the assertion library, you can use another assertion library if you choose (or even write your own.)
The Mocha interface system allows developers to choose their style of DSL. MochaRails is hardcoded for now to the "BDD" interface, but if you want to write in one of the other styles, please "+1" the open issue to make it configurable.
In your Rails >= 3.1 app, you must add gem 'mocha_rails' to your Gemfile:
group :test, :development do
gem 'mocha_rails'
end
MochaRails includes a convenient install generator that adds a route to config/routes.rb and adds a mocha-suite.js
Sprockets manifest file to either spec/javascripts or test/javascripts.
To install the required configuration, you must run:
rails g mocha_rails:install
The generator has a single option, --mount, which lets you specify the route to your test suite. The default
route is /mocha.
Sprockets will not load two files with the same relative asset path and base name, even if they are located in different directories, such
as app/assets/javascripts/example.js and test/javascripts/example.js.coffee. In this example, the test file will
not be loaded.
One solution is to simply give your test files a different name, for example in test/javascripts/mocha-suite.js:
//= require example
//= require example-test
However, if you prefer to give your test files the same name as your production files, you must then use a different path:
//= require example
//= require test/example
To get you started, here is a sample Mocha test with a should style assertion, to be placed in a file
test/javascripts/array-test.js.coffee:
describe 'Array', ->
beforeEach ->
@array = [1,2,3]
describe '#indexOf()', ->
it 'should return -1 when not present', ->
@array.indexOf(4).should.equal -1
Start your server in development mode, and open http://localhost:3000/mocha. You should see Mocha's very attractive results page. If you
see a completely blank page, or an almost blank page with a few zeros in the upper right corner, check your JavaScript console for errors.
- Chris Smith (quartzmo)
MochaRails was inspired by the design of Jasminerice.
MIT-LICENSE