Question

使用scalatest惯用匹配器如何检查类是A还是B的实例？

我尝试使用或但它不起作用

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

这里How to do an instanceof check with Scala(Test)解释了如何使用isInstanceOf，但不解释如何使用or或问候。

Answer 1

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

一起使用

例如，

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

如果实际与预期不匹配，则错误输出正确的消息

  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）

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

或者使用scalaTest匹配器的运算符

1 个答案:

参考