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Testing GenServers in Elixir
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=== Integration Testing === Integration testing involves testing the interaction between multiple GenServers or with external systems. ==== Using ExUnit and ExMachina ==== ExMachina is a testing library that provides utilities for writing integration tests. ```elixir defmodule MyGenServerTest do use ExUnit.Case, async: true use ExMachina.Ecto, repo: MyApp.Repo alias MyApp.Repo alias MyApp.MyGenServer setup do Ecto.Adapters.SQL.Sandbox.mode(Repo, {:shared, self()}) {:ok, pid} = GenServer.start_link(MyGenServer, nil) {:ok, pid: pid} end test "handle_message/2 updates database correctly" do pid = Map.get(:pid) assert {:ok, _} = MyGenServer.handle_message(pid, :update_database) assert {:ok, %{} = _changeset} = Repo.get_by(MyModel, id: 1) end end ```
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