Refactor test runtime ownership

test/support/integration_case.ex

@@ -0,0 +1,43 @@
+defmodule Parrhesia.IntegrationCase do
+  @moduledoc false
+
+  use ExUnit.CaseTemplate
+
+  alias Ecto.Adapters.SQL.Sandbox
+  alias ExUnit.Case
+  alias Parrhesia.Repo
+  alias Parrhesia.TestSupport.Runtime
+
+  using opts do
+    quote bind_quoted: [opts: opts] do
+      use Case, async: Keyword.get(opts, :async, false)
+
+      alias Ecto.Adapters.SQL.Sandbox
+      alias Parrhesia.Repo
+
+      @moduletag parrhesia_sandbox: Keyword.get(opts, :sandbox, false)
+    end
+  end
+
+  setup tags do
+    Runtime.ensure_started!()
+
+    case tags[:parrhesia_sandbox] do
+      false ->
+        :ok
+
+      true ->
+        :ok = Sandbox.checkout(Repo)
+
+      :shared ->
+        :ok = Sandbox.checkout(Repo)
+        Sandbox.mode(Repo, {:shared, self()})
+
+        on_exit(fn ->
+          Sandbox.mode(Repo, :manual)
+        end)
+    end
+
+    :ok
+  end
+end