Allows #context calls in Rails 3 tests like rspec/minitest spec

gistfile1.rb

  # Create a context block like rspec. 
  #
  # Inspired by:
  # - MiniTest::Spec
  # - Chris Wanstrath's https://gist.github.com/25455
  #
  # Examples:
  #
  #   class UserTest < ActiveSupport::TestCase
  #     context "Auth" do
  #        test "..." do; end
  #        ...
  #        
  #        context "Another context" do
  #          test "..." do; end
  #          ...
  #        end
  #     end
  #   end
  def self.context(name, &block)
    name = self.to_s + name.split(/\W+/).map {|s| s.capitalize }.join
    klass = Object.class_eval "class #{name} < #{self}; end; #{name}"

    # Remove previous class's test methods
    klass.public_instance_methods.grep(/^test_/).each do |tname|
      klass.send :undef_method, tname
    end

    # Ensure ActionController::TestCase tests the correct controller
    if index = self.ancestors.index(ActionController::TestCase)
      klass.tests self.ancestors[index-1].to_s.sub(/Test$/, '').constantize
    end

    klass.class_eval &block
  end