Proof of concept commit.

.gitignore

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+*.gem
+.bundle
+pkg/*
+.idea

Gemfile

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+source "http://rubygems.org"
+
+# Specify your gem's dependencies in cactus.gemspec
+gemspec

Gemfile.lock

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+PATH
+  remote: .
+  specs:
+    cactus (0.0.1)
+
+GEM
+  remote: http://rubygems.org/
+  specs:
+
+PLATFORMS
+  ruby
+
+DEPENDENCIES
+  cactus!

Rakefile

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+require "bundler/gem_tasks"

cactus.gemspec

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+# -*- encoding: utf-8 -*-
+$:.push File.expand_path("../lib", __FILE__)
+
+require "cactus/version"
+
+Gem::Specification.new do |s|
+  s.name        = "cactus"
+  s.version     = Cactus::VERSION
+  s.authors     = ["Winston Teo Yong Wei"]
+  s.email       = ["[email protected]"]
+  s.homepage    = ""
+  s.summary     = %q{CSS BDD framework}
+  s.description = %q{Test your CSS}
+
+  s.files         = `git ls-files`.split("\n")
+  s.test_files    = `git ls-files -- {test,spec,features}/*`.split("\n")
+  s.executables   = `git ls-files -- bin/*`.split("\n").map{ |f| File.basename(f) }
+  s.require_paths = ["lib"]
+
+  # s.add_development_dependency "rspec"
+end

lib/cactus.rb

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+require "cactus/version"
+
+# Rails Helper
+lib_path = File.dirname(__FILE__)
+require "#{lib_path}/cactus/rails/engine.rb" if defined?(Rails)

lib/cactus/rails/engine.rb

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+require "#{File.dirname(__FILE__)}/helpers/view_helper"
+
+module Cactus
+  module Rails
+    class Engine < ::Rails::Engine
+      initializer "cactus" do
+        ActiveSupport.on_load(:action_controller) do
+          include Cactus::Rails::ViewHelper
+        end
+      end
+    end
+  end
+end

lib/cactus/rails/helpers/view_helper.rb

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+module Cactus
+  module Rails
+    module ViewHelper
+      extend ActiveSupport::Concern
+
+      included do
+        helper_method "cactus"
+      end
+
+      def cactus
+        html  = "<script src='/assets/cactus.js' type='text/javascript'></script>"
+        html += "<script src='/cactus_specs/spec.js' type='text/javascript'></script>"
+        html.html_safe
+      end
+    end
+  end
+end

lib/cactus/version.rb

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+module Cactus
+  VERSION = "0.0.2"
+end

vendor/assets/javascripts/cactus.js

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+var cactus = {};
+
+cactus.ensure = function(dom, att) {
+  var dom = dom;
+  var att = att;
+  var css = $(dom).css(att);
+
+  return {
+    toEqual: function(expected) {
+      if(css !== expected) {
+        console.log("Expected " + dom + ":" + att + " to equal " + expected + " but got " + css + " instead." );
+      }
+    }
+  }
+};