posts_controller_spec.rb

    describe 'POST #create' do
        it "saves the post to the db" do
            expect{
                post :create, :post => {:title => "The title", :body => "The Body"}
            }.to change(Post, :count).by(1)
        end

        it "redirects to @post" do
            @post = {:title => 'The title', :body => 'The body'}
            post :create, :post => @post 
            expect(response).to redirect_to '/posts/1' 
        end
    end