或带有 scalaTest 匹配器的运算符

Question

使用 scalatest 惯用匹配器如何检查一个类是 A 还是 B 的实例？

我尝试使用 or 但它不起作用

e shouldBe a [ChannelWriteException] || e shouldBe a [ConnectException]

这里How to do an instanceof check with Scala(Test)解释如何使用isInstanceOf，而不是如何制作一个或 问候。

Answer 1

您可以将Matcher#should(Matcher[T]) 与Matcher#or[U <: T](Matcher[U]) 一起使用

例子，

  it("test instanceOf A or B") {
    val actual = new Thread()
    actual should (be (a [RuntimeException]) or be (a [Thread]))
  }

如果实际与预期不符，则会因正确的消息传递而出错，

  it("test instanceOf A or B") {
    val actual = new String()
    actual should (be (a [RuntimeException]) or be (a [Thread]))
  }

错误

"" was not an instance of java.lang.RuntimeException, but an instance of java.lang.String, and 
"" was not an instance of java.lang.Thread, but an instance of java.lang.String

传统方式，（我还在 2000 年代）

val actual = new Thread()
assert(actual.isInstanceOf[RuntimeException] || actual.isInstanceOf[Thread])

参考

http://www.scalatest.org/user_guide/using_matchers#logicalExpressions

Is there anyway we can give two conditions in Scalatest using ShouldMatchers