docker - Elixir - 无法在 dockerized 应用程序中运行混合测试

Question

我有这个信号量配置

除了最后一个“Test Elixir”之外，所有测试都通过了。相反，我收到以下错误：

** (RuntimeError) cannot configure sandbox with pool DBConnection.Poolboy.
To use the SQL Sandbox, configure your repository pool as:

      pool: Ecto.Adapters.SQL.Sandbox

    (ecto) lib/ecto/adapters/sql/sandbox.ex:429: Ecto.Adapters.SQL.Sandbox.mode/2
    (elixir) lib/code.ex:370: Code.require_file/2
    (elixir) lib/enum.ex:645: Enum."-each/2-lists^foreach/1-0-"/2
    (elixir) lib/enum.ex:645: Enum.each/2
    (mix) lib/mix/tasks/test.ex:229: Mix.Tasks.Test.run/1