regex - 避免在 ScalaTest 中针对正则表达式的 matchPattern 上的弃用警告

Question

考虑以下用于测试 IdentifierRe 的代码和 IntPart :

// Code under test
val IdentifierRe = "([a-z]+)([0-9]+)".r
object IntPart {
  def unapply(arg: String): Option[Int] = Some(arg.toInt)
}

// Test cases
"foo123" should matchPattern { case IdentifierRe("foo", IntPart(123)) => }
"foo 123" should not fullyMatch IdentifierRe

它编译但给出以下警告:

warning: method unapplySeq in class Regex is deprecated (since 2.11.0): extracting a match result from anything but a CharSequence or Match is deprecated

我相信问题在于 matchPattern接受 PartialFunction[Any, _] ，导致弃用 Regex#unapplySeq(Any)用于提取。我可以解决它:

"foo123" match {
  case IdentifierRe("foo", IntPart(123)) => succeed
  case _ => fail
}

甚至:

"foo123" should fullyMatch regex (IdentifierRe withGroups("foo", "123"))

但是在仍然使用 IntPart 的同时，是否有更简洁的方法来避免警告？测试用例中的提取器？这个想法是 IdentifierRe和 IntPart经常一起用于模式匹配，我们想在测试用例中模仿它。

Answer 1

考虑定义 custom matcher像这样

def matchRegexPattern(right: PartialFunction[String, _]): Matcher[String] =
  (left: String) =>
    MatchResult(
      right.isDefinedAt(left),
      s"$left does not match regex pattern",
      s"$left does match regex pattern "
    )

请注意我们如何替换 Any与 String在 PartialFunction[String, _]应该注意警告。现在像这样模式匹配

"foo123" should matchRegexPattern { case IdentifierRe("foo", IntPart(123)) => }