如何通过Spec2测试注入的类

Question

我正在尝试测试类

@Singleton
class Foo @Inject()(bar: Bar)(implicit ec: ExecutionContext) {
  def doSomething = bar.doSomethingInBar
}
class Bar {
  def doSomethingInBar = true
}

通过下面提到的Specification类

class FooTest @Inject()(foo: Foo) extends Specification {
  "foo" should {
    "bar" in {
      foo.doSomething mustEqual (true)
    }
  }
}

现在，当我运行时，我会收到以下错误

Can't find a constructor for class Foo

我遵循此处提到的解决方案

并定义了Injector

object Inject {
  lazy val injector = Guice.createInjector()
  def apply[T <: AnyRef](implicit m: ClassTag[T]): T =
    injector.getInstance(m.runtimeClass).asInstanceOf[T]
}

和我的规格类中的lazy val foo: Foo = Inject[Foo]。它解决了我的构造函数初始化问题，但我现在遇到此错误。

[error]   ! check the calculate assets function
[error]    Guice configuration errors:
[error]    
[error]    1) No implementation for scala.concurrent.ExecutionContext was bound.
[error]      while locating scala.concurrent.ExecutionContext

Answer 1

您需要提供隐式ExecutionEnv才能使代码工作

@RunWith(classOf[JUnitRunner])
class FooTest(implicit ee: ExecutionEnv)  extends Specification {
  "foo" should {
    "bar" in {
      foo.doSomething mustEqual (true)
    }
  }
}

现在在代码中的某个地方，您需要初始化foo构造，并且可以通过构造函数将其通过 - 这是依赖注入的重点。