在 ScalaCheck 中罕见（间歇性）java.nio.charset.MalformedInputException

Question

我的 ScalaCheck 代码中出现非常罕见但可重复的 MalformedInputException。

除了 "occasionally," 之外，我无法完美地确定它或获得可靠的复制品，但我认为这是产生问题的代码：

// Generate varying Unicode characters:
val unicodeCharacter = Gen.choose(Char.MinValue, Char.MaxValue).filter(Character.isDefined)

// Generate varying Unicode strings across all legal characters::
def unicodeGenerator(generator: Gen[Char] = unicodeCharacter, minimum: Int = 5, maximum: Int = 20): Gen[String] = Gen.chooseNum(minimum, maximum).flatMap { n =>
    Gen.sequence[String, Char](List.fill(n)(generator))
}

// The unit test that I think is occasionally blowing up:
"random strings longer than 20 characters" ! prop { (s: String) => { s.length > 20 must beTrue } }.setGen(unicodeGenerator(unicodeCharacter, 21, 30))

这是我见过的例外情况：

Exception in thread "Thread-391" java.nio.charset.MalformedInputException: Input length = 1
    at java.nio.charset.CoderResult.throwException(CoderResult.java:281)
    at sun.nio.cs.StreamEncoder.implWrite(StreamEncoder.java:285)
    at sun.nio.cs.StreamEncoder.write(StreamEncoder.java:125)
    at sun.nio.cs.StreamEncoder.write(StreamEncoder.java:135)
    at java.io.Writer.write(Writer.java:157)
    at scala.xml.XML$.write(XML.scala:108)
    at scala.xml.XML$$anonfun$save.apply$mcV$sp(XML.scala:91)
    at scala.xml.XML$$anonfun$save.apply(XML.scala:91)
    at scala.xml.XML$$anonfun$save.apply(XML.scala:91)
    at scala.util.control.Exception$Catch.apply(Exception.scala:102)
    at scala.xml.XML$.save(XML.scala:90)
    at sbt.JUnitXmlTestsListener.writeSuite(JUnitXmlTestsListener.scala:170)
    at sbt.JUnitXmlTestsListener.endGroup(JUnitXmlTestsListener.scala:159)
    at sbt.React$$anonfun$react.apply(ForkTests.scala:133)
    at sbt.React$$anonfun$react.apply(ForkTests.scala:133)
    at scala.collection.immutable.List.foreach(List.scala:318)
    at sbt.React.react(ForkTests.scala:133)
    at sbt.ForkTests$$anonfun$mainTestTask$Acceptor$.run(ForkTests.scala:74)
    at java.lang.Thread.run(Thread.java:745)
Internal error when running tests: sbt.ForkMain$Run$RunAborted: java.net.SocketException: Broken pipe

任何人都知道是什么原因造成的，更重要的是如何可靠地预防它？

Answer 1

当 JUnitXmlTestsListener 使用 XML.save 保存 XML 元素时，使用的默认编码是 ISO-8859-1。它应该使用 UTF-8 代替。

您可以尝试从构建中删除 JUnitXmlTestsListener 并 use specs2 生成 junit-xml 报告：

libraryDependencies += "org.specs2" %% "specs2-junit" % "3.6"

sbt> testOnly *MySpec -- console junitxml

在 ScalaCheck 中罕见（间歇性）java.nio.charset.MalformedInputException

Rare (intermittent) java.nio.charset.MalformedInputException in ScalaCheck

scala

exception

scalacheck