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Use Commanded to build your own Elixir applications following the CQRS/ES pattern.

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commanded test registration support registration_test_case.ex
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test/registration/support/registration_test_case.ex 

defmodule Commanded.RegistrationTestCase do

  import Commanded.SharedTestCase



  define_tests do

    alias Commanded.Registration

    alias Commanded.Registration.{RegisteredServer, RegisteredSupervisor}



    setup %{registry: registry} do

      Application.put_env(:commanded, :registry, registry)



      {:ok, supervisor} = RegisteredSupervisor.start_link()



      on_exit(fn ->

        Application.delete_env(:commanded, :registry)

      end)



      [supervisor: supervisor]

    end



    describe "`start_child/3`" do

      test "should return child process PID on success" do

        assert {:ok, _pid} = RegisteredSupervisor.start_child("child")

      end



      test "should return existing child process when already started" do

        assert {:ok, pid} = RegisteredSupervisor.start_child("child")

        assert {:ok, ^pid} = RegisteredSupervisor.start_child("child")

      end

    end



    describe "`start_link/3`" do

      test "should return process PID on success" do

        assert {:ok, pid} = start_link("registered")

        assert is_pid(pid)

      end



      test "should return existing process when already started" do

        assert {:ok, pid} = start_link("registered")

        assert {:ok, ^pid} = start_link("registered")

      end

    end



    describe "`whereis_name/1`" do

      test "should return `:undefined` when not registered" do

        assert Registration.whereis_name("notregistered") == :undefined

      end



      test "should return `PID` when child registered" do

        assert {:ok, pid} = RegisteredSupervisor.start_child("child")

        assert Registration.whereis_name("child") == pid

      end



      test "should return `PID` when process registered" do

        assert {:ok, pid} = start_link("registered")

        assert Registration.whereis_name("registered") == pid

      end

    end



    describe "`supervisor_child_spec/2`" do

      test "should return a valid child_spec" do

        assert Registration.supervisor_child_spec(RegisteredSupervisor, "child") ==

                 %{

                   id: Commanded.Registration.RegisteredSupervisor,

                   start: {Commanded.Registration.RegisteredSupervisor, :start_link, ["child"]},

                   type: :supervisor

                 }

      end

    end



    defp start_link(name) do

      Registration.start_link(name, RegisteredServer, [])

    end

  end

end