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How to use thunk method of io.kotest.property.arbitrary.map class

Best Kotest code snippet using io.kotest.property.arbitrary.map.thunk

predef-test.kt

Source:predef-test.kt

...80}81/**82 * Catches `System.err` output, for testing purposes.83 */84fun catchSystemErr(thunk: () -> Unit): String {85  val outStream = ByteArrayOutputStream()86  catchSystemErrInto(outStream, thunk)87  return String(outStream.toByteArray(), StandardCharsets.UTF_8)88}89/**90 * Catches `System.err` output into `outStream`, for testing purposes.91 */92@Synchronized93fun <A> catchSystemErrInto(outStream: OutputStream, thunk: () -> A): A {94  val oldErr = System.err95  val fakeErr = PrintStream(outStream)96  System.setErr(fakeErr)97  return try {98    thunk()99  } finally {100    System.setErr(oldErr)101    fakeErr.close()102  }103}104fun Arb.Companion.throwable(): Arb<Throwable> =105  Arb.string().map(::RuntimeException)106fun <A> Arb.Companion.result(right: Arb<A>): Arb<Result<A>> {107  val failure: Arb<Result<A>> = Arb.throwable().map { e -> Result.failure<A>(e) }108  val success: Arb<Result<A>> = right.map { a -> Result.success(a) }109  return Arb.choice(failure, success)110}111fun <L, R> Arb.Companion.either(left: Arb<L>, right: Arb<R>): Arb<Either<L, R>> {112  val failure: Arb<Either<L, R>> = left.map { l -> l.left() }...

map.kt

Source:map.kt

...24 * Returns a new [TrampolineArb] from the receiver [Arb] which composes the operations of [next] lambda25 * using a trampoline method. This allows [next] function to be executed without exhausting call stack.26 */27internal fun <A, B> Arb<A>.trampoline(next: (Sample<A>) -> Arb<B>): Arb<B> = when (this) {28   is TrampolineArb -> this.thunk(next)29   else -> TrampolineArb(this).thunk(next)30}31/**32 * The [TrampolineArb] is a special Arb that exchanges call stack with heap.33 * In a nutshell, this arb stores command chains to be applied to the original arb inside a list.34 * This technique is an imperative reduction of Free Monads. This eliminates the need of creating intermediate35 * Trampoline Monad and tail-recursive function on those which can be expensive.36 * This minimizes the amount of code and unnecessary object allocation during sample generation in the expense of typesafety.37 *38 * This is an internal implementation. Do not use this TrampolineArb as is and please do not expose this39 * to users outside of the library. For library maintainers, please use the [Arb.trampoline] extension function.40 * The extension function will provide some type-guardrails to workaround the loss of types within this Arb.41 */42@Suppress("UNCHECKED_CAST")43internal class TrampolineArb<A> private constructor(44   private val first: Arb<A>,45   private val commands: List<(Sample<Any>) -> Arb<Any>>46) : Arb<A>() {47   constructor(first: Arb<A>) : this(first, emptyList())48   fun <A, B> thunk(fn: (Sample<A>) -> Arb<B>): TrampolineArb<B> =49      TrampolineArb(50         first,51         commands + (fn as (Sample<Any>) -> Arb<Any>)52      ) as TrampolineArb<B>53   override fun edgecase(rs: RandomSource): A? =54      commands55         .fold(first as Arb<Any>) { currentArb, next ->56            val currentEdge = currentArb.edgecase(rs) ?: currentArb.sample(rs).value57            next(Sample(currentEdge))58         }59         .edgecase(rs) as A?60   override fun sample(rs: RandomSource): Sample<A> =61      commands62         .fold(first as Arb<Any>) { currentArb, next ->...

thunk

Using AI Code Generation

1forAll(::additionIsCommutative)2forAll { (a: Int, b: Int, c: Int) -> (a + b) == (c + b) }3forAll { (a: Int, b: Int, c: Int, d: Int, e: Int, f: Int) -> (a + b + c + d + e + f) == (f + e + d + c + b + a) }4forAll(::additionIsCommutative)5forAll { (a: Int, b: Int, c: Int) -> (a + b) == (c + b) }6forAll { (a: Int, b: Int, c: Int, d: Int, e: Int, f: Int) -> (a + b + c + d + e + f) == (f + e + d + c + b + a) }7forAll(::additionIsCommutative)

thunk

Using AI Code Generation

1) : Arb<String> by arb.map { it + "!" } {2    override fun toString() = "MyArb($arb)"3}4val myArb = MyArb(Arb.string())5) : Arb<String> {6    private val arb2 = arb.map { it + "!" }7    override fun edgecases() = arb2.edgecases()8    override fun sample(rs: RandomSource): Sample<String> = arb2.sample(rs)9    override fun toString() = "MyArb($arb)"10}11val myArb = MyArb(Arb.string())12Arb.map() is a useful method that allows us to map the data generated by an Arb to a different type. It can be used to convert

thunk

Using AI Code Generation

1val arb = Arb . string (). map { it . toInt () } arb . edgecases () shouldBe listOf ( 0 ) arb . values ( 100 ) shouldContain 02val arb = Arb . string (). map { it . toInt () } arb . edgecases () shouldBe listOf ( 0 ) arb . values ( 100 ) shouldContain 03val arb = Arb . string (). map { it . toInt () } arb . edgecases () shouldBe listOf ( 0 ) arb . values ( 100 ) shouldContain 04val arb = Arb . string (). map { it . toInt () } arb . edgecases () shouldBe listOf ( 0 ) arb . values ( 100 ) shouldContain 05val arb = Arb . string (). map { it . toInt () } arb . edgecases () shouldBe listOf ( 0 ) arb . values ( 100 ) shouldContain 06val arb = Arb . string (). map { it . toInt () } arb . edgecases () shouldBe listOf ( 0 ) arb . values ( 100 ) shouldContain 07val arb = Arb . string (). map { it . toInt () } arb . edgecases () shouldBe listOf ( 0 ) arb . values ( 100 ) shouldContain 08val arb = Arb . string (). map { it . toInt () } arb . edgecases () shouldBe listOf ( 0 ) arb . values ( 100 ) shouldContain 09val arb = Arb . string (). map { it . toInt () } arb . edgecases () shouldBe listOf ( 0 ) arb . values ( 100 ) shouldContain 0

thunk

Using AI Code Generation

1    init {2        "should generate a map of size 0" {3            forAll(0..10) { size: Int ->4                val map = MapArbitrary(StringArbitrary(), IntArbitrary()).map { it }.edgecases().first()5            }6        }7    }8}9override fun edgecases(): List<Map<K, V>> {10    val keys = keyArb.edgecases()11    val values = valueArb.edgecases()12    return (0..maxSize).map { size ->13        (0 until size).map { keys[it] to values[it] }.toMap()14    }15}

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