test/test_helper.exs
:ExUnit.start Mix.Task.run "ecto.create", ["--quiet"] Mix.Task.run "ecto.migrate", ["--quiet"] # Add this line: Code.require_file("priv/repo/seeds.exs") Ecto.Adapters.SQL.begin_test_transaction(Expensive.Repo)
You can, of course, require a different file instead.