[英]scalacheck: Generate a non empty string
What is the best way to generate a non empty string, when in the context of something like this在这样的上下文中,生成非空字符串的最佳方法是什么
private def createIndexFn() = {
for{
someChar <- Gen.alphaString
aNumber <- Gen.choose(1,100)
//...
}
yield {
MyThing(AnotherType(someChar.toString), SomeOtherType(aNumber), aNumber)
}
}
where you need maybe someChar to be a non empty string.您可能需要 someChar 成为非空字符串。 I know you can use
whenever
in the forAll
section but I wonder how to do it in this part of the generator.我知道你可以在
forAll
部分中的whenever
使用,但我想知道如何在生成器的这一部分中使用它。
Thanks谢谢
The accepted answer caused a high ratio of discarded tests for me, I ended up using:接受的答案导致我放弃测试的比例很高,我最终使用了:
import org.scalacheck._
Arbitrary(Gen.nonEmptyListOf[Char](Arbitrary.arbChar.arbitrary)).map(_.mkString))
What I was looking for was:我要找的是:
import org.scalacheck.Arbitrary.arbitrary
arbitrary[String].suchThat(!_.isEmpty)
and can be used like并且可以像
for {
name <- arbitrary[String].suchThat(!_.isEmpty)
age <- Gen.choose(0, 100)
} yield Person(name, age)
Hopefully this helps someone希望这有助于某人
Another way is to create a fix length random string另一种方法是创建一个固定长度的随机字符串
Gen.listOfN(10, Gen.asciiPrintableChar).map(_.mkString)
or to create a random length with a constrained length或创建具有约束长度的随机长度
for {
n <- Gen.chooseNum(5, 20)
chars <- Gen.listOfN(n, Gen.asciiPrintableChar)
} yield chars.mkString
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