macroposts_controller.rb

class MacropostsController < ApplicationController
  before_filter :authenticate
  before_filter :authorized_user, :only => :destroy

  def create
    params[:macropost][:user_id] = current_user.id
    params[:macropost][:project_id] = params[:project_id]
    @macropost = Macropost.new(params[:macropost])

    if @macropost.save
      flash[:success] = "Macropost created!"
      redirect_to project_path(@macropost.project)
    else
      render 'pages/home'
    end
  end
end

macroposts_controller_spec.rb

describe "POST 'create'" do

  before(:each) do
    @macropost = stub_model(Macropost)
    Macropost.stub(:new).and_return(@macropost)

    @current_user = Factory(:user)
    test_sign_in(@current_user)
  end

  it "builds a new Macropost with the submitted macropost params" do
    Macropost.should_receive(:new).with(hash_including(:this => :that))
    post :create, :macropost => {:this => :that}
  end

  it "adds the project id to the macropost params" do
    Macropost.should_receive(:new).with(hash_including(:project_id => 37))
    post :create, :macropost => {}, :project_id => 37
  end

  it "adds the current user id to the macropost params" do
    Macropost.should_receive(:new).with(hash_including(:user_id => @current_user.id))
    post :create, :macropost => {}
  end

  describe "failure" do
    it "renders the homepage" do
      @macropost.stub(:save).and_return(false)
      post :create, :macropost => {}
      response.should render_template('pages/home')
    end
  end

  describe "success" do
    it "redirects to the project page" do
      @macropost.stub(:save).and_return(true)
      post :create, :macropost => {}
      response.should redirect_to(project_path(@project))
    end

    it "creates a flash message" do
      @macropost.stub(:save).and_return(true)
      post :create, :macropost => {}
      flash[:success].should =~ /macropost created/i
    end
  end
end