Continuous CoffeeScript testing with Guard and Jasmine

0_README.md

Continuous CoffeeScript testing with Guard and Jasmine

This Gist shows how to set up a Rails project to practice BDD with CoffeeScript, Guard and Jasmine. You can see this setup in action on Vimeo

• Install Gems with Bundler with bundle install
• Define your guards with mate Guardfile
• Initialize Jasmine with bundle exec jasmine init
• Configure Jasmine with mate spec/support/yasmine.ym
• Start Guard with bundle exec guard
• Start Jasmine with bundle exec rake jasmine
• Open your browser with open http://localhost:8888
• Press the LiveReload button
• Write your specs (example app_coffeescripts_math.coffee goes to app/coffeescripts/math.coffee)
• See the Growl notifications
• Write your code (example spec_coffeescripts_math_spec.coffee goes to app/coffeescripts/math_spec.coffee)
• Watch the Jasmine report

That's it

1_Gemfile

gem 'guard'
gem 'guard-coffeescript'
gem 'guard-livereload'
gem 'jasmine'

2_Guardfile

guard 'coffeescript', :output => 'public/javascripts/compiled' do
  watch(%r{^app/assets/javascripts/(.*)\.coffee})
end

guard 'coffeescript', :output => 'spec/javascripts' do
  watch(%r{^spec/coffeescripts/(.*)\.coffee})
end

guard 'livereload', :apply_js_live => false do
  watch(%r{^spec/javascripts/.+\.js$})
  watch(%r{^public/javascripts/compiled/.+\.js$})
end

3_jasmine.yml

src_dir: public/javascripts

src_files:
  - underscore.js
  - compiled/math.js

spec_dir: spec/javascripts

spec_files:
  - **/*_spec.js

4_math_spec.coffee

describe 'Math:', ->
  describe 'fib()', ->
    it 'should calculate the numbers correctly up to fib(16)', ->
      fib = [0, 1, 1, 2, 3, 5, 8, 13, 21, 34, 55, 89, 144, 233, 377, 610, 987]
      expect(Math.fib(i)).toEqual fib[i] for i in [0..16]

  describe 'uuid()', ->
    it 'should have the proper UUID format', ->
      expect(Math.uuid()).toMatch /[A-Z0-9]{8}-[A-Z0-9]{4}-[A-Z0-9]{4}-[A-Z0-9]{4}-[A-Z0-9]{13}/

    it 'should have always the numer 4 at position 14', ->
      expect(Math.uuid()).toMatch /[A-Z0-9]{8}-[A-Z0-9]{4}-4[A-Z0-9]{3}-[A-Z0-9]{4}-[A-Z0-9]{13}/
      expect(Math.uuid()).toMatch /[A-Z0-9]{8}-[A-Z0-9]{4}-4[A-Z0-9]{3}-[A-Z0-9]{4}-[A-Z0-9]{13}/
      expect(Math.uuid()).toMatch /[A-Z0-9]{8}-[A-Z0-9]{4}-4[A-Z0-9]{3}-[A-Z0-9]{4}-[A-Z0-9]{13}/

    it 'should generate a unique uuid for 1000 generated uuids at least', ->
      uuids = []
      counter = 0

      while counter < 1000
        uuids.push Math.uuid()
        counter++

      expect(uuids.length).toEqual _.uniq(uuids).length

5_math.coffee

#
# Calculate the fibonacci numbers
#
# Warning: This script can go really slow if you try to calculate the number with n > 20
#
Math.fib = (n) ->
    s = 0
    return s if n == 0
    if n == 1
      s += 1
    else
      Math.fib(n - 1) + Math.fib(n - 2)


#
# Generate a RFC 4122 GUID
#
# See section 4.4 (Algorithms for Creating a UUID from Truly Random or
# Pseudo-Random Numbers) for generating a GUID, since we don't have
# hardware access within JavaScript.
#
# More info:
#
#   - http://www.rfc-archive.org/getrfc.php?rfc=4122
#   - http://www.broofa.com/2008/09/javascript-uuid-function/
#   - http://stackoverflow.com/questions/105034/how-to-create-a-guid-uuid-in-javascript
#
Math.uuid = ->

    chars = '0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz'.split('')
    uuid = new Array(36)
    random = 0

    for digit in [0..36]
      switch digit
        when 8, 13, 18, 23
          uuid[digit] = '-'
        when 14
          uuid[digit] = '4'
        else
          random = 0x2000000 + (Math.random() * 0x1000000) | 0 if (random <= 0x02)
          r = random & 0xf
          random = random >> 4
          uuid[digit] = chars[if digit == 19 then (r & 0x3) | 0x8 else r]

    uuid.join('')