fetch_cart_test.exs

defmodule MangoWeb.Plugs.FetchCartTest do
  use MangoWeb.ConnCase 
  alias Mango.Sales.Order

  test "create and set cart on first visit" do
    conn = get build_conn(), "/"

    cart_id = get_session(conn, :cart_id)
    assert %Order{status: "In Cart"} = conn.assigns.cart
    assert cart_id == conn.assigns.cart.id
  end

  test "fetch cart from session on subsequent visit" do
    conn = get build_conn(), "/"          # first visit

    cart_id = get_session(conn, :cart_id) # cart id from first visit
    conn = get conn, "/"                  # second visit
    assert cart_id == conn.assigns.cart.id
  end

end