shoulda example failure

shoulda test:

  test "should destroy shop" do
    assert_difference('Shop.count', -1) do
      delete :destroy, :id => shops(:one).to_param
    end

    assert_redirected_to shops_path
  end


Shoulda error:

1) Error:
test_should_destroy_shop(ShopsControllerTest):
NoMethodError: undefined method `shops' for #<ShopsControllerTest:0x236cdf4>
/test/functional/shops_controller_test.rb:40:in `test_should_destroy_shop'
/test/functional/shops_controller_test.rb:39:in `test_should_destroy_shop'