spec.rb

describe StudiesController do
  sign_in

  describe "#index" do
    let(:studies) { FactoryGirl.create_list :study, 3 }

    subject { get :index }

    specify { expect_it.to be_successful }
    specify { expect_it.to assign(:studies).with(studies) }
  end

  describe "#show" do
    context "with a valid study id" do
      let(:study) { FactoryGirl.create :study }

      subject { get :show, id: study.id }

      specify { expect_it.to be_successful }
      specify { expect_it.to assign(:study).with(study) }
    end 

    context "with an invalid study id" do
      subject { get :show, id: -1 }

      specify { expect_it{}.to raise_error(ActiveRecord::RecordNotFound) }
    end
  end
end