user_test.rb

 # example unit test context using should_change and should_not_change

  context "Given a user" do
    setup do
      @user = create_user
    end
    
    context "when sent initials with a hyphen and lower case" do
      setup do
        @user.update_attributes!( :first_name => "Jason", :last_name => "happy-Klein" )
      end
      should_change("initials", :to => "JHK"){ @user.reload.initials }
    end
    
    context "when sent #enable_api!" do
      setup do
        @user.enable_api!
      end
      should_change("user api key", :from => nil){ @user.api_key }

      context "and then sent #disable_api!" do
        setup do
          @user.disable_api!
        end
        should_change("user api key", :to => ""){ @user.api_key }
      end
    end
    context "given a project" do
      setup do
        User.current_user = @user
        create_project
      end
      context "when destroyed in hosted version" do
        setup do
          @user.destroy
        end
        should_change("projects", :by => -1){ Project.count }
      end
      context "when destroyed in installable version" do
        setup do
          License.stubs(:installed?).returns(true)
          @user.destroy
        end
        should_not_change("project count"){ Project.count }
      end
    end
  end