Adam Michela soopa

Testing front-end for a Sinatra app with RSpec and Capybara

I've used Cucumber quite a bit on my last job. It's an excellent tool, and I believe readable tests are the way to the future. But I could never get around to write effective scenarios, or maintain the boatload of text that the suite becomes once you get to a point where you have decent coverage. On top of that, it didn't seem to take much for the suite to become really slow as tests were added.

A while ago I've seen a gist by Lachie Cox where he shows how to use RSpec and Capybara to do front-end tests. That sounded perfect for me. I love RSpec, I can write my own matchers when I need them with little code, and it reads damn nicely.

So for my Rails Rumble 2010 project, as usual, I rolled a Sinatra app and figured I should give the idea a shot. Below are my findings.

	# Application
	class App < Sinatra::Base
	set :hi, "Hello"

	configure :test do
	set :hi, "Hello There!"
	end
	end

	# Registering a extention

	# Author: Pieter Noordhuis
	# Description: Simple demo to showcase Redis PubSub with EventMachine
	#
	# Update 7 Oct 2010:
	# - This example does not appear to work with Chrome >=6.0. Apparently,
	# the WebSocket protocol implementation in the cramp gem does not work
	# well with Chrome's (newer) WebSocket implementation.
	#
	# Requirements:
	# - rubygems: eventmachine, thin, cramp, sinatra, yajl-ruby

	@interface UIImage (Shadow)

	+ (UIImage )imageWithContentsOfFile:(NSString )path withShadow:(BOOL)applyShadow;

	+ (UIImage )imageNamed:(NSString )name withShadow:(BOOL)applyShadow;

	+ (UIImage )applyShadow:(UIImage )theImage;

	@end

	require "time"
	require "date"

	class Date
	def to_time
	Time.local(year, month, day)
	end
	end

	class Time

	require 'rubygems'
	require 'superfeedr-rb' # [sudo] gem install
	require 'pp'

	# Blather.logger.level = Logger::DEBUG # increase log level to see XMPP traffic

	# Please make sure you use your own superfeedr credentials (http://superfeedr.com/subscriber) as this account is wiped out regularly.
	Superfeedr::Client.connect('[email protected]', 'yyy') do \|client\|
	# Susbcribes to the feed :
	client.feed('http://superfeedr.com/track/music') do \|status, entries\|

	#! /usr/bin/env ruby

	class AdditionProblemGenerator

	attr_accessor :max, :number_of_problems

	def initialize(max = 20, number_of_problems = 20)
	self.max = max
	self.number_of_problems = number_of_problems
	end

	class Hash
	# Intersection on hash keys (and values) that actually returns a Hash.
	# The RHS can be an Array or a Hash.
	#
	# == Examples:
	# >> hsh = {:banana => "elephant", :bar => "foo", :baz => "wuux"}
	# >> hsh & [:bar]
	# => {:bar=>"foo"}
	#
	# >> hsh & {:bar => "foo", :baz => "wuux"}

	module ApplicationHelper
	# pretty page titles
	# yield_for(:title, 'default text goes here') in layout
	# content_for(:title, 'some text') in view
	def yield_for(content_sym, default)
	output = content_for(content_sym)
	output = default if output.blank?
	output
	end
	end

	#
	# When you're using inject with a hash or somesuch, you can subgroup the source's elements:
	#
	# v--- the parens part here
	{ 1 => 2, 3 => 4, :your => :mom }.inject({}) do \|h, (k,v)\|
	h[k] = v**2 if v.is_a?(Numeric)
	h
	end
	# => {1=>4, 3=>16}

Adam Michela soopa

Testing front-end for a Sinatra app with RSpec and Capybara

Gemfile