Guice ，无法创建注入器

Question

我正在尝试创建用于测试 api 的注入器。

The test binding are as follows
  class ApiTestModule extends AbstractModule {
    def configure(): Unit = {
      bind(classOf[Client]).in(classOf[Singleton])
      bind(classOf[ApiGetController]).in(classOf[Singleton])
      bind(classOf[ApiPostController]).in(classOf[Singleton])
      bind(classOf[IndexService]).in(classOf[Singleton])
      bind(classOf[PanelService]).in(classOf[Singleton])
      bind(classOf[EntitiesService]).in(classOf[Singleton])
      bind(classOf[AuthenticatedPublicApiAction]).in(classOf[Singleton])
      bind(classOf[RateLimitedApiAction]).in(classOf[Singleton])
      bind(classOf[ApiKeyValidatorUpdaterThread]).in(classOf[Singleton])
      bind(classOf[ApiKeyValidatorService]).in(classOf[Singleton])
      bind(classOf[ArticleFrontService]).in(classOf[Singleton])

    }

我已经在代码中创建了注入器

 val testModule = new AbstractModule() {
    def configure() = {
      new ApiTestModule().configure(binder())
    }
  }
  val injector = new GuiceApplicationBuilder()
    .overrides(testModule).injector()

  val apiGetController = injector.instanceOf(classOf[ApiGetController])

我收到以下错误

异常或错误导致运行中止：无法创建注入器，请参阅以下错误：

1) No implementation for org.elasticsearch.client.Client annotated with @com.google.inject.name.Named(value=SpikeClient) was bound.
  while locating org.elasticsearch.client.Client annotated with @com.google.inject.name.Named(value=SpikeClient)
    for parameter 2 at com.newswhip.api.service.ApiArticleService.<init>(ApiArticleService.scala:19)
  while locating com.newswhip.api.service.ApiArticleService
    for parameter 1 at com.newswhip.api.controllers.ApiGetController.<init>(ApiGetController.scala:57)
  at com.newswhip.spike.inject.TestBindings$ApiTestModule.configure(TestBindings.scala:133) (via modules: com.google.inject.util.Modules$OverrideModule -> com.newswhip.api.service.ApiArticleServiceTest$$anon)

2) No implementation for org.elasticsearch.client.Client annotated with @com.google.inject.name.Named(value=SpikeClient) was bound.
  while locating org.elasticsearch.client.Client annotated with @com.google.inject.name.Named(value=SpikeClient)
    for parameter 2 at com.newswhip.api.service.ApiArticleService.<init>(ApiArticleService.scala:19)
  while locating com.newswhip.api.service.ApiArticleService
    for parameter 1 at com.newswhip.api.controllers.ApiPostController.<init>(ApiPostController.scala:17)
  at com.newswhip.spike.inject.TestBindings$ApiTestModule.configure(TestBindings.scala:134) (via modules: com.google.inject.util.Modules$OverrideModule -> com.newswhip.api.service.ApiArticleServiceTest$$anon)

3) No implementation for org.elasticsearch.client.Client annotated with @com.google.inject.name.Named(value=SpikeClient) was bound.
  while locating org.elasticsearch.client.Client annotated with @com.google.inject.name.Named(value=SpikeClient)
    for parameter 0 at com.newswhip.spike.article.service.SpikeEsQueryBuilder.<init>(SpikeEsQueryBuilder.scala:20)
  while locating com.newswhip.spike.article.service.SpikeEsQueryBuilder
    for parameter 2 at com.newswhip.spike.article.service.EntitiesService.<init>(EntitiesService.scala:30)
  at com.newswhip.spike.inject.TestBindings$ApiTestModule.configure(TestBindings.scala:137) (via modules: com.google.inject.util.Modules$OverrideModule -> com.newswhip.api.service.ApiArticleServiceTest$$anon)

4) No implementation for org.elasticsearch.client.Client was bound.
  at com.newswhip.spike.inject.TestBindings$ApiTestModule.configure(TestBindings.scala:131) (via modules: com.google.inject.util.Modules$OverrideModule -> com.newswhip.api.service.ApiArticleServiceTest$$anon)

5) No implementation for play.api.db.Database was bound.
  at com.newswhip.spike.inject.TestBindings$ApiTestModule.configure(TestBindings.scala:132) (via modules: com.google.inject.util.Modules$OverrideModule -> com.newswhip.api.service.ApiArticleServiceTest$$anon

)

我认为问题出在我的绑定模块中，但我无法弄清楚问题出在哪里。任何帮助将不胜感激。

Answer 1

Mockito 对测试很有用。我想你可以像下面这样用 guice

进行注入测试

class TestModule extends AbstractModule with MockitoSugar {

  val mockClient: Client = mock[Client]

  override def configure(): Unit = {
    bind(classOf[Client]).toInstance(mockClient)
  }

}

模拟和存根很容易。如果你想在测试中模拟或存根，你可以像这样使用

doReturn("dummyResult").when(testModule.mockClient).someMethod()

Answer 2

看看Guice's BoundFields。然后你可以像这样创建一个测试：

public class TestFoo extends WordSpec with BeforeAndAfterEach with MockitoSugar {
  // bind(Bar.class).toInstance(barMock);
  @Bind var barMock: Bar = _

  // Foo depends on Bar.
  @Inject var foo: Foo = _

  override def beforeEach() = {
    barMock = mock[Bar];
    Guice.createInjector(BoundFieldModule.of(this)).injectMembers(this);
  }

  "your Test" should {
    "do" in {
      // your test case
    }
  }
}

Guice ，无法创建注入器

Guice , unable to create injector

dependency-injection

scala

guice