Ruby on Rails

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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