scala - 如何在specs2中断言对象的类型

Question

在 specs2 测试中，如何验证函数返回值的类型？

说，函数:

trait P
trait C1 extends P
trait C2 extends P

def test(n:Int): P = if(n%2==0) new C1 else new C2

测试:

"test" should {
   "return C1 when n is even" in {
       val result = test(2)
       // how to assert
       // 'result' should have type of C1?
   }
}

我想知道如何断言值的类型 result ?

Answer 1

有一个 haveClass匹配器:

class FooSpec extends Specification {
  trait P
  class C1 extends P
  class C2 extends P

  def test(n:Int): P = if(n%2==0) new C1 else new C2

  "test" should {
    "return C1 when n is even" in {
      val result = test(2)
      result must haveClass[C1]
    }
  }
}