Rspec test

test_rspec.rb

require "rails_helper"

describe TestsController, type: :controller do
  render_views

  let(:tests){FactoryGirl.create_list :test, 3}
  let(:test){FactoryGirl.create :test}

  describe "GET #index" do
    before {get :index}
    it {expect(assigns :tests).to be_an ActiveRecord::Relation}
    it {expect(assigns :tests).to eq tests}
    it {expect(response).to render_template :index}
  end

  describe "POST #create" do
    let(:test_attributes) do
      test.attributes.except "id", "created_at", "updated_at"
    end

    before do
      expect_any_instance_of(Test).to receive(:create)
        .and_return result_of_save
      post :create, test: test_attributes
    end

    context "when saving succeeded" do
      before {let(:result_of_save){true}}

      it {expect(response).to redirect_to :tests]
    end

    context "when saving failed" do
      before {let(:result_of_save){false}}

      it {expect(assigns :test).to eq Test.new(test_attributes)}
      it {expect(response).to render_template :new}
    end
  end
end