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Setting Up Middleman with Jasmine

Setting up home
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Currently, my favorite tool for generating static websites is Middleman. I recently wrote my version of the TodoMVC app using Middleman and KnockoutJS. I wanted to use Jasmine for my unit tests and had a little trouble setting it up. Here are the steps I took to get it up and running.

First, create a Middleman project:

middleman init example

Next, we need to add the Jasmine to the Gemfile, install it via bundler, then initialize it:

# In your Gemfile add:
gem "jasmine", "~> 2.0.2"
bundle install && bundle exec jasmine init

Now we need to create a spec/javascripts/spec.js file. This file will need to require all of your individual spec files. The easiest way is to use the require_tree command:

//= require_tree .

Next in spec/javascripts/support/jasmine_helper.rb we need to add Rack endpoints that Sprockets will use to serve our source and spec files:

require "sprockets"

Jasmine.configure do |config|
  %w(source spec).each do |f|
    config.add_rack_path("/#{f}/", lambda { do |env|

Finally, we need to tell Jasmine about the endpoints we created in spec/support/jasmine.yml:

  - source/all.js

  - ../spec/spec.js

Now assuming we have a spec file in spec/javascripts that looks like this:

describe("hello world", function() {
    it("says hello with name", function() {
        expect(Hello.say("Bob")).toEqual("Hello, Bob");

... and we add the implementation to make that spec pass in source/javascripts/all.js:

Hello = (function() {
    return {
        say: function(name) {
            return "Hello, " + name;

... when we run the jasmine rake tasks we should see our passing spec.

# run the specs with output to the command line
bundle exec rake jasmine:ci

# or start a Jasmine server; navigate to the
# indicated URL to see the results page
bundle exec rake jasmine

Hopefully this will save someone else the headaches I had trying to set this up.

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