使用easymock在scalatest中模拟java.util.Iterator <! - ? - >

时间:2014-12-12 21:19:10

标签: scala easymock scalatest scala-java-interop

我有一个使用java库(cipango)的scala项目。我试图模拟库中返回java.util.Iterator的方法之一。在scala方面,我有一个scala.collections.Iterator [_],我使用scala.collections.JavaConversions进行转换。但它不会编译,并且失败并显示消息:

Error:(63, 60) type mismatch;
found   : java.util.Iterator[_$1] where type _$1
required: java.util.Iterator[?0] where type ?0
   mockSipApplicationSessions(id).getSessions.andReturn(sessionsAsJavaIterator)

(可能不相关的一个细节,但我要提到的是,sessionsAsJavaIterator中的实际元素本身就是java接口的模拟。)

我创建了一个显示类似问题的小例子。该示例的错误消息并不完全相同,但它非常相似。

爪哇:

import java.util.Iterator;

public interface IterateMe {
    Iterator<?> getSomething();
}

public class SomeClass {
}

Scala的:

import org.scalatest.mock.EasyMockSugar
import org.scalatest.{Matchers, FunSpecLike}
import scala.collection.JavaConversions._

class AdhocSpec extends FunSpecLike  with Matchers with EasyMockSugar {
  describe("IterateMe") {
    it("can not be mocked!") {
      val m = mock[IterateMe]
      val toReturn: java.util.Iterator[_] = Iterator(mock[SomeClass])

      expecting { m.getSomething().andReturn(toReturn) }

      whenExecuting(m) {
        m.getSomething.next() should equal("A")
      }
    }
  }
}

编译错误:

Error:(13, 46) type mismatch;
 found   : java.util.Iterator[(some other)_$1(in value <local AdhocSpec>)] where type (some other)_$1(in value <local AdhocSpec>)
 required: java.util.Iterator[_$1(in value <local AdhocSpec>)] where type _$1(in value <local AdhocSpec>)
      expecting { m.getSomething().andReturn(toReturn) }

1 个答案:

答案 0 :(得分:2)

试试这个。在某些时候,您需要在测试中处理实际的参数化类型。我还将测试修改为我认为你想要的,因为&#34; A&#34;在代码中的任何地方都没有提到过。

import org.scalatest.mock.EasyMockSugar
import org.scalatest.{Matchers, FunSpecLike}
import scala.collection.JavaConversions._

class AdhocSpec extends FunSpecLike with Matchers with EasyMockSugar {
  describe("IterateMe") {
    it("can be mocked!") {
      val m = mock[IterateMe]
      val someObject: SomeClass = mock[SomeClass]
      val toReturn: java.util.Iterator[SomeClass] = Iterator[SomeClass](someObject)

      expecting {m.getSomething.asInstanceOf[java.util.Iterator[SomeClass]].andReturn(toReturn) }

      whenExecuting(m) {
        m.getSomething.next() should equal(someObject)
      }
    }
  }
}