Craft GraphQL APIs in Elixir with Absinthe/

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Test the Subscriptions

Test the Subscriptions

Learn how to test your API and subscriptions.

We'll cover the following...

Subscriptions testing

Testing your API is important, and subscriptions are no exception. We’ve been using helpers from the PlateSlate.ConnCase module in our test to ease building HTTP based integration tests. We’ll need a similar PlateSlate.SubscriptionCase module to manage the subscription integration tests with channels. While the ConnCase module is generated by Phoenix when we first create the project, we’ll need to make the SubscriptionCase module ourselves:

defmodule PlateSlateWeb.SubscriptionCase do
   @moduledoc """
   This module defines the test case to be used by
   subscription tests
   """
   use ExUnit.CaseTemplate
   using do 
     quote do
        # Import conveniences for testing with channels
        use PlateSlateWeb.ChannelCase
        use Absinthe.Phoenix.SubscriptionTest,
          schema: PlateSlateWeb.Schema
        setup do
          PlateSlate.Seeds.run()
          {:ok, socket} =
              Phoenix.ChannelTest.connect(PlateSlateWeb.UserSocket, %{})
          {:ok, socket} =
              Absinthe.Phoenix.SubscriptionTest.join_absinthe(socket)
          {:ok, socket: socket}
        end
        import unquote(__MODULE__), only: [menu_item: 1]
      end
    end
  # handy function for grabbing a fixture 
  def menu_item(name) do 
    PlateSlate.Repo.get_by!(PlateSlate.Menu.Item, name: name)
  end
end

This module sets up the socket we’ll use in each of our test cases, and also gives us a ...