Rails - Sep 2013 - redirect on browser success, but redirect on functional test is error

line_items.yml:
one:
  product_id: 1
  cart_id: 1
  quantity: 1

carts.yml:
one: {}

product.rb:
has_many :line_items

cart.rb:
has_many :line_items, dependent: :destroy

line_item.rb:
belongs_to :product
belongs_to :cart

line_item_controller.rb:
def destroy
    @line_item = LineItem.find(params[:id])
    @cart = @line_item.cart
    @line_item.destroy

    respond_to do |format|
      format.html { redirect_to @cart }
      format.json { head :no_content }
    end
end

line_item_controller_test.rb:

    setup do
        @line_item = line_items(:one)
    end

    test "should destroy line_item" do
      @cart = @line_item.cart
      assert_difference(''LineItem.count'', -1) do
      delete :destroy, id: @line_item
    end

  assert_redirected_to @cart
end


----------------------------------------------
rake test:functionals

  1) Error:
test_should_destroy_line_item(LineItemsControllerTest):
ActionController::ActionControllerError: Cannot redirect to nil!

------------------------------------------------

@cart in line_items_controller.rb may be nil, when executing functional
test.

Accessing by browser  "line_items/20/ post:delete", correctly
redirected
show cart that contain line_items(id:20)

why is functional test error?

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carts.yml does not create the cart with id=1 that LineItem.find(1) refers 
to.

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