Scala-播放-如何在Test中模拟导入play.api.libs.concurrent.CustomExecutionContext并将其用作隐式参数？

Question

我有一个测试正在测试期望隐式CustomExecutionContext的类：

@Singleton
class MyRepo @Inject()
(appConfigService: AppConfigService)
(implicit ec: RepositoryDispatcherContext)

现在，我需要测试该类，并在测试过程中注入模拟调度程序上下文。 最初，我考虑使用现成的标准全局执行上下文。

implicit executionContext = scala.concurrent.ExecutionContext.Implicits.global

但是由于期望其他类型的实例而导致测试失败：

找不到参数ec的隐式值：common.executor.RepositoryDispatcherContext

这是我的自定义执行上下文：

import javax.inject.{Inject}
import akka.actor.ActorSystem
import play.api.libs.concurrent.CustomExecutionContext

class RepositoryDispatcherContext @Inject()(actorSystem: ActorSystem) extends CustomExecutionContext(actorSystem, "repository.dispatcher")

想知道如何将自定义执行上下文的模拟实例用作Test类中的隐式参数吗？

Answer 1

您可以创建自定义调度程序的子类，并覆盖必要的方法：

import org.specs2.mutable.Specification

import akka.actor.ActorSystem
import scala.concurrent.ExecutionContext

class MySomethingSpec extends Specification with Mockito {

  "MySomething" should {    

    "mock repository dispatcher itself" in {
      class MyMockedRepositoryDispatcher(executionContext: ExecutionContext) extends RepositoryDispatcherContext(ActorSystem()) {
        override def execute(command: Runnable) = executionContext.execute(command)
        override def reportFailure(cause: Throwable) = executionContext.reportFailure(cause)
      }

      val executionContext: ExecutionContext = ??? // whatever you need
      val repositoryDispatcher: RepositoryDispatcherContext = new MyMockedRepositoryDispatcher(executionContext)

      // do what you need
      // assertions
    }
  }
}