shared_examples "it is success" do
    it "has a 200 status code" do
      action
      expect(response.status).to eq(200)
    end
    it "is success" do
      action
        expect(response).to be_success
    end
  end
  shared_examples "it assigns object" do
    it "assigns object variable" do 
      action
      expect(assigns(object_variable)).to eq(assigned_object_variable)
    end
  end
  shared_examples "it assigns new object" do
    it "assigns new object" do
      action
      expect(assigns(object_variable)).to be_a_new(object_class)
      expect(assigns(object_variable)).not_to be_persisted

    end
  end
  shared_examples "it assigns persisted object" do
    it "assigns new object" do
      action
        expect(assigns(object_variable)).to be_a(object_class)
        expect(assigns(object_variable)).to be_persisted
    end
  end

  shared_examples "it is restricted" do
    it "is expected to raise error" do
      bypass_rescue
      expect { action }.to raise_error(CanCan::AccessDenied)
    end
    it "is not success" do
      action
      expect(response).not_to be_success
    end
  end