爲什麼有時在Spec2中無法捕獲異常？

Question

Scala的測試代碼：

import play.api.test._ 
import scala._ 
import org.specs2.execute.Result 

object ThrowTest extends PlaySpecification { 

    "throwA" should { 
    "catch the exception test1" in { 
     world must throwA[Exception] 
    } 
    "catch the exception test2" in { 
     hello { 
     world => 
      world must throwA[Exception] 
     } 
    } 
    } 

    def hello(action: (String) => Result) = { 
    action(world) 
    } 

    def world: String = { 
    throw new Exception("world-exception") 
    } 

} 

爲什麼test1工作如我所料，但test2不是，這將引發異常外，從來沒有抓住它：

[info] ! catch the exception test2 
[error]  Exception: world-exception (ThrowTest.scala:26) 
[error] database.ThrowTest$.world(ThrowTest.scala:26) 
[error] database.ThrowTest$.hello(ThrowTest.scala:22) 
[error] database.ThrowTest$$anonfun$1$$anonfun$apply$4.apply(ThrowTest.scala:14) 
[error] database.ThrowTest$$anonfun$1$$anonfun$apply$4.apply(ThrowTest.scala:14) 
[info] Total for specification ThrowTest 

Answer 1

由於測試2您的除之前的hello異常從action調用。 action是String => Result和你world其稱之爲 - 評估時 - 拋出一個異常，爲此，所有這些代碼：

world =>world must throwA[Exception] 

從不執行。