scala - 在 ScalaTest 中注入(inject) PlaySlick 数据库连接

Question

我有以下使用 PlaySlick 连接到数据库的 DAO。该类有一个方法read我需要用 ScalaTest 进行测试。我的问题是我不知道如何模拟 DatabaseConfigProvider将其注入(inject) UsersDAO上课并测试read方法。这是要测试的类:

class UsersDAO @Inject()(@NamedDatabase("mydb") 
          protected val dbConfigProvider: DatabaseConfigProvider)
          extends with HasDatabaseConfigProvider[JdbcProfile] {

   import driver.api._

   val db1 = dbConfigProvider.get[JdbcProfile].db

   def read (sk: Int) = {
      val users = TableQuery[UserDB]
      val action = users.filter(_.sk === sk).result
      val future = db1.run(action.asTry)
      future.map{
        case Success(s) => 
          if (s.length>0)
            Some(s(0))
          else
            None
        case Failure(e) => throw new Exception ("Failure: " + e.getMessage)
      }
   }

}

这是我编写测试的尝试:

class UserDAOTest extends PlaySpec with OneAppPerSuite  {

  implicit override lazy val app = new GuiceApplicationBuilder().
  configure(
            Configuration.from(
                Map(
                    "slick.dbs.mydb.driver" -> "slick.driver.MySQLDriver$",
                    "slick.dbs.mydb.db.driver" -> "com.mysql.jdbc.Driver",
                    "slick.dbs.mydb.db.url" -> "jdbc:mysql://localhost:3306/control",
                    "slick.dbs.mydb.db.user" -> "root",
                    "slick.dbs.mydb.db.password" -> "xxxxx"
                )
            )
        ).build

  val dbConfigProvider = app.injector.instanceOf[DatabaseConfigProvider]

  "Example " should {
    "be valid" in {

      val controller = new UsersDAO(dbConfigProvider)
      val result = controller.read(1)
      println(result) 
    }
  }

当我运行测试时，它失败并显示以下错误消息:

com.google.inject.ConfigurationException: Guice configuration errors:

1) No implementation for play.api.db.slick.DatabaseConfigProvider was bound. while locating play.api.db.slick.DatabaseConfigProvider

Answer 1

恕我直言，最好不要干扰 Play 的注入(inject)东西，而只是使用它。这应该有效:

class UserDAOTest extends PlaySpec with OneAppPerSuite with ScalaFutures {

  implicit override lazy val app = new GuiceApplicationBuilder().
    configure(
      "slick.dbs.mydb.driver" -> "slick.driver.MySQLDriver$",
      "slick.dbs.mydb.db.driver" -> "com.mysql.jdbc.Driver",
      "slick.dbs.mydb.db.url" -> "jdbc:mysql://localhost:3306/control",
      "slick.dbs.mydb.db.user" -> "root",
      "slick.dbs.mydb.db.password" -> "xxxxx").build

  def userDAO(implicit app: Application): UserDAO = Application.instanceCache[UserDAO].apply(app)

  "UserDAO" should {
    "do whatever" in {
      whenReady(userDAO.read(1)) { res =>
        println(res)
      }
    }
  }

}

我更新了我的 repo以防我错过了什么。