How to use io.kotest.property.arbitrary class of io.kotest.property.arbitrary package

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

RoomsKtTest.kt

Source:RoomsKtTest.kt

1package com.tylerkindy.betrayal.db2import com.tylerkindy.betrayal.Direction3import io.kotest.assertions.throwables.shouldThrow4import io.kotest.core.spec.style.DescribeSpec5import io.kotest.matchers.collections.shouldBeEmpty6import io.kotest.matchers.collections.shouldContainExactlyInAnyOrder7import io.kotest.matchers.should8import io.kotest.matchers.shouldBe9import io.kotest.property.Arb10import io.kotest.property.Exhaustive11import io.kotest.property.arbitrary.ShortShrinker12import io.kotest.property.arbitrary.arbitrary13import io.kotest.property.arbitrary.enum14import io.kotest.property.arbitrary.set15import io.kotest.property.checkAll16import io.kotest.property.exhaustive.ints17import io.kotest.property.exhaustive.map18import io.kotest.property.forAll19import org.jetbrains.exposed.sql.insert20import org.jetbrains.exposed.sql.select21import org.jetbrains.exposed.sql.selectAll22import org.jetbrains.exposed.sql.transactions.transaction23import kotlin.random.nextInt24val directionSets = Arb.set(Arb.enum<Direction>(), 0..Direction.values().size)25val rotations = Exhaustive.ints(0..3).map { it.toShort() }26val invalidRotationValues = (Short.MIN_VALUE..Short.MAX_VALUE) - (0..3)27val invalidRotations = arbitrary(listOf(Short.MIN_VALUE, -1, 4, Short.MAX_VALUE), ShortShrinker) {28    it.random.nextInt(invalidRotationValues.indices).let { i -> invalidRotationValues[i] }.toShort()29}30class RoomsKtTest : DescribeSpec({31    useDatabase()32    describe("returnRoomToStack") {33        it("returns to empty stack") {34            transaction {35                val gameId = "ABCDEF"36                val stackId =37                    RoomStacks.insert {38                        it[this.gameId] = gameId39                        it[curIndex] = null40                        it[flipped] = false41                    } get RoomStacks.id42                val roomId =43                    Rooms.insert {44                        it[this.gameId] = gameId45                        it[roomDefId] = 1446                        it[gridX] = 047                        it[gridY] = 048                        it[rotation] = 049                    } get Rooms.id50                returnRoomToStack(gameId, roomId)51                Rooms.selectAll().shouldBeEmpty()52                val stackRows = RoomStacks.select { RoomStacks.id eq stackId }53                stackRows.count().shouldBe(1)54                stackRows.first().should {55                    it[RoomStacks.curIndex].shouldBe(0)56                }57                RoomStackContents.select { RoomStackContents.stackId eq stackId }58                    .first().should {59                        it[RoomStackContents.index].shouldBe(0)60                        it[RoomStackContents.roomDefId].shouldBe(14)61                    }62            }63        }64        it("returns to non-empty stack") {65            transaction {66                val gameId = "ABCDEF"67                val stackId = RoomStacks.insert {68                    it[this.gameId] = gameId69                    it[curIndex] = 1770                    it[flipped] = false71                } get RoomStacks.id72                RoomStackContents.insert {73                    it[this.stackId] = stackId74                    it[index] = 2575                    it[roomDefId] = 976                }77                RoomStackContents.insert {78                    it[this.stackId] = stackId79                    it[index] = 1780                    it[roomDefId] = 1381                }82                RoomStackContents.insert {83                    it[this.stackId] = stackId84                    it[index] = 385                    it[roomDefId] = 2386                }87                val roomId = Rooms.insert {88                    it[this.gameId] = gameId89                    it[roomDefId] = 1490                    it[gridX] = 091                    it[gridY] = 092                    it[rotation] = 093                } get Rooms.id94                returnRoomToStack(gameId, roomId)95                Rooms.selectAll().shouldBeEmpty()96                RoomStackContents.selectAll()97                    .map { it[RoomStackContents.index] }98                    .shouldContainExactlyInAnyOrder(0, 1, 2, 3)99            }100        }101    }102    describe("rotateDoors") {103        it("maintains number of directions") {104            forAll(directionSets, rotations) { dirs, rotation ->105                rotateDoors(dirs, rotation).size == dirs.size106            }107        }108        it("throws for invalid rotations") {109            checkAll(directionSets, invalidRotations) { dirs, rotation ->110                shouldThrow<IllegalArgumentException> { rotateDoors(dirs, rotation) }111            }112        }113        it("returns the same directions with no rotation") {114            forAll(directionSets) { dirs ->115                rotateDoors(dirs, 0) == dirs116            }117        }118        it("always returns all directions") {119            val allDirections = Direction.values().toSet()120            forAll(rotations) { rotation ->121                rotateDoors(allDirections, rotation) == allDirections122            }123        }124        it("rotates doors") {125            rotateDoors(126                setOf(Direction.NORTH, Direction.WEST),127                3128            ) shouldBe setOf(Direction.NORTH, Direction.EAST)129        }130    }131})...

CoroutineTransactionalApplicationTests.kt

Source:CoroutineTransactionalApplicationTests.kt

1package br.com.demo.coroutine_transactional2import br.com.demo.coroutine_transactional.domain.book.BookService3import br.com.demo.coroutine_transactional.domain.book.model.AuthorDefinition4import br.com.demo.coroutine_transactional.domain.book.model.BookDefinition5import br.com.demo.coroutine_transactional.persistence.PersistenceConfiguration6import br.com.demo.coroutine_transactional.persistence.repository.JPAAuthorRepository7import br.com.demo.coroutine_transactional.persistence.repository.JPABookRepository8import io.kotest.assertions.throwables.shouldThrowAny9import io.kotest.core.spec.style.StringSpec10import io.kotest.extensions.spring.SpringExtension11import io.kotest.matchers.booleans.shouldBeFalse12import io.kotest.matchers.booleans.shouldBeTrue13import io.kotest.property.Arb14import io.kotest.property.arbitrary.arbitrary15import io.kotest.property.arbitrary.bool16import io.kotest.property.arbitrary.next17import io.kotest.property.arbitrary.string18import io.kotest.property.arbitrary.uuid19import io.kotest.property.checkAll20import org.springframework.beans.factory.annotation.Autowired21import org.springframework.test.context.ContextConfiguration22@ContextConfiguration(classes = [PersistenceConfiguration::class])23class CoroutineTransactionalApplicationTests : StringSpec() {24    @Autowired25    lateinit var bookService: BookService26    @Autowired27    lateinit var jpaAuthorRepository: JPAAuthorRepository28    @Autowired29    lateinit var jpaBookRepository: JPABookRepository30    override fun extensions() = listOf(SpringExtension)31    init {32        "validate @Transactional commit/rollback behaviour when using coroutine" {33            val bookGenerator = arbitrary { rs ->34                BookDefinition(35                    id = Arb.uuid().next(rs).toString(),36                    isbn = Arb.string().next(rs),37                    title = Arb.string().next(rs),38                    author = AuthorDefinition(39                        id = Arb.uuid().next(rs).toString(),40                        name = Arb.uuid().next(rs).toString(),41                    )42                )43            }44            checkAll(bookGenerator, Arb.bool()) { book, shouldThrows ->45                if (shouldThrows) {46                    shouldThrowAny { bookService.publish(book, shouldThrows) }47                    jpaAuthorRepository.existsById(book.author.id).shouldBeFalse()48                    jpaBookRepository.existsById(book.id).shouldBeFalse()49                } else {50                    bookService.publish(book, shouldThrows)51                    jpaAuthorRepository.existsById(book.author.id).shouldBeTrue()52                    jpaBookRepository.existsById(book.id).shouldBeTrue()53                }54            }55        }56    }57}...

generators.kt

Source:generators.kt

1package be.tapped.vlaamsetv2import be.tapped.goplay.profile.IdToken3import be.tapped.vlaamsetv.auth.prefs.Credential4import be.tapped.vrtnu.profile.AccessToken5import be.tapped.vrtnu.profile.Expiry6import be.tapped.vrtnu.profile.RefreshToken7import be.tapped.vrtnu.profile.TokenWrapper8import be.tapped.vrtnu.profile.XVRTToken9import be.tapped.vtmgo.profile.JWT10import io.kotest.property.Arb11import io.kotest.property.RandomSource12import io.kotest.property.arbitrary.arbitrary13import io.kotest.property.arbitrary.long14import io.kotest.property.arbitrary.string15import io.kotest.property.arbitrary.take16val vrtTokenWrapperArb: Arb<TokenWrapper> = arbitrary {17    val accessToken = AccessToken(Arb.string(minSize = 1).gen())18    val refreshToken = RefreshToken(Arb.string(minSize = 1).gen())19    val expiry = Expiry(Arb.long().gen())20    TokenWrapper(21        accessToken,22        refreshToken,23        expiry,24    )25}26val goPlayAccessTokenArb: Arb<be.tapped.goplay.profile.AccessToken> =27    arbitrary { be.tapped.goplay.profile.AccessToken(Arb.string().gen()) }28val goPlayRefreshTokenArb: Arb<be.tapped.goplay.profile.RefreshToken> =29    arbitrary { be.tapped.goplay.profile.RefreshToken(Arb.string().gen()) }30val goPlayIdTokenARb: Arb<IdToken> = arbitrary { IdToken(Arb.string().gen()) }31val goPlayTokenArb: Arb<be.tapped.goplay.profile.TokenWrapper> = arbitrary {32    val accessToken = goPlayAccessTokenArb.gen()33    val expiresIn = goPlayExpiryArb.gen()34    val tokenType = Arb.string().gen()35    val refreshToken = goPlayRefreshTokenArb.gen()36    val idToken = goPlayIdTokenARb.gen()37    be.tapped.goplay.profile.TokenWrapper(38        accessToken,39        expiresIn,40        tokenType,41        refreshToken,42        idToken,43    )44}45val goPlayExpiryArb: Arb<be.tapped.goplay.profile.Expiry> = arbitrary { be.tapped.goplay.profile.Expiry(Arb.long().gen()) }46val vtmJWTArb: Arb<JWT> = arbitrary { JWT(Arb.string().gen()) }47val expiryArb: Arb<be.tapped.vtmgo.profile.Expiry> = arbitrary { be.tapped.vtmgo.profile.Expiry(Arb.long().gen()) }48val vtmTokenWrapperArb: Arb<be.tapped.vtmgo.profile.TokenWrapper> = arbitrary {49    be.tapped.vtmgo.profile.TokenWrapper(vtmJWTArb.gen(), expiryArb.gen())50}51val xVRTTokenArb: Arb<XVRTToken> = arbitrary { XVRTToken(Arb.string().gen()) }52val vrtRefreshTokenArb: Arb<RefreshToken> = arbitrary { RefreshToken(Arb.string().gen()) }53val credentialsArb: Arb<Credential> = arbitrary { Credential(Arb.string().gen(), Arb.string().gen()) }54fun <T> Arb<T>.genList(amount: Int = 5, rs: RandomSource = RandomSource.Default): List<T> = take(amount, rs).toList()55fun <T> Arb<T>.gen(rs: RandomSource = RandomSource.Default): T = genList(1, rs).first()...

FSimplifySquareRootBigIntPropertyBasedTest.kt

Source:FSimplifySquareRootBigIntPropertyBasedTest.kt

1import io.kotest.assertions.throwables.shouldThrow2import io.kotest.core.spec.style.FunSpec3import io.kotest.matchers.should4import io.kotest.matchers.shouldBe5import io.kotest.matchers.string.startWith6import io.kotest.property.Arb7import io.kotest.property.arbitrary.arbitrary8import io.kotest.property.arbitrary.int9import io.kotest.property.arbitrary.negativeInt10import io.kotest.property.arbitrary.nonNegativeInt11import io.kotest.property.checkAll12class FSimplifySquareRootBigIntPropertyBasedTest : FunSpec({13    context("Simplification of square roots") {14        val squareRootArb = arbitrary {15            SquareRootBI(16                coefficient = Arb.nonNegativeInt().bind().toBigInteger(),17                radicand = Arb.nonNegativeInt().bind().toBigInteger()18            )19        }20        context("Simplified square root should be equal to original square root") {21            squareRootArb.checkAll { originalSquareRoot ->22                run {23                    val simplifiedSquareRoot = simplifySquareRoot(originalSquareRoot)24                    (simplifiedSquareRoot.coefficient.pow(2).multiply(simplifiedSquareRoot.radicand))25                        .shouldBe(26                            originalSquareRoot.coefficient.pow(2).multiply(originalSquareRoot.radicand)27                        )28                }29            }30        }31        context("Simplified square root cannot be simplified further") {32            squareRootArb.checkAll { originalSquareRoot ->33                val simplifiedSquareRoot = simplifySquareRoot(originalSquareRoot)34                val twiceSimplifiedSquareRoot =35                    simplifySquareRoot(simplifiedSquareRoot)36                simplifiedSquareRoot.coefficient shouldBe twiceSimplifiedSquareRoot.coefficient37                simplifiedSquareRoot.radicand shouldBe twiceSimplifiedSquareRoot.radicand38            }39        }40        val negativeSquareRootArb = arbitrary {41            SquareRootBI(42                coefficient = Arb.int().bind().toBigInteger(),43                radicand = Arb.negativeInt().bind().toBigInteger()44            )45        }46        context("Radicand cannot be negative") {47            negativeSquareRootArb.checkAll { squareRoot ->48                run {49                    val exception = shouldThrow<IllegalArgumentException> {50                        simplifySquareRoot(squareRoot)51                    }52                    exception.message should startWith("Radicand cannot be negative")53                }54            }55        }56    }57})...

ExampleSpec.kt

Source:ExampleSpec.kt

1package org.example2import arrow.core.Either3import arrow.optics.Traversal4import arrow.typeclasses.Monoid5import io.kotest.assertions.arrow.core.shouldBeRight6import io.kotest.core.spec.style.StringSpec7import io.kotest.matchers.shouldBe8import io.kotest.matchers.types.shouldBeTypeOf9import io.kotest.property.Arb10import io.kotest.property.arbitrary.int11import io.kotest.property.arbitrary.list12import io.kotest.property.arbitrary.map13import io.kotest.property.arbitrary.positiveInt14import io.kotest.property.arbitrary.string15import io.kotest.property.arrow.core.MonoidLaws16import io.kotest.property.arrow.core.either17import io.kotest.property.arrow.core.functionAToB18import io.kotest.property.arrow.laws.testLaws19import io.kotest.property.arrow.optics.TraversalLaws20import kotlin.jvm.JvmInline21class ExampleSpec : StringSpec({22  "true shouldBe true" {23    true shouldBe true24  }25  "exception should fail" {26    // throw RuntimeException("Boom2!")27  }28  "kotest arrow extension use-cases" {29    // smart-cast abilities for arrow types30    Either.Right("HI").shouldBeRight().shouldBeTypeOf<String>()31  }32  // utilise builtin or costume Laws with Generators to verify behavior33  testLaws(34    MonoidLaws.laws(Monoid.list(), Arb.list(Arb.string())),35    MonoidLaws.laws(Monoid.numbers(), Arb.numbers())36  )37  // optics Laws from arrow38  testLaws(39    TraversalLaws.laws(40      traversal = Traversal.either(),41      aGen = Arb.either(Arb.string(), Arb.int()),42      bGen = Arb.int(),43      funcGen = Arb.functionAToB(Arb.int()),44    )45  )46})47fun Arb.Companion.numbers(): Arb<Numbers> =48  Arb.positiveInt().map { it.toNumber() }49fun Int.toNumber(): Numbers =50  if (this <= 0) Zero else Suc(minus(1).toNumber())51// natural numbers form a monoid52fun Monoid.Companion.numbers(): Monoid<Numbers> =53  object : Monoid<Numbers> {54    override fun empty(): Numbers =55      Zero56    override fun Numbers.combine(b: Numbers): Numbers =57      Suc(b)58  }59// natural numbers60sealed interface Numbers61object Zero : Numbers62@JvmInline63value class Suc(val value: Numbers) : Numbers...

PropertyBasedTestingSpec.kt

Source:PropertyBasedTestingSpec.kt

1package sandbox.samples2import io.kotest.core.spec.style.StringSpec3import io.kotest.inspectors.forAll4import io.kotest.matchers.comparables.shouldBeGreaterThan5import io.kotest.matchers.shouldNotBe6import io.kotest.matchers.string.shouldHaveLength7import io.kotest.matchers.types.shouldBeInstanceOf8import io.kotest.property.Arb9import io.kotest.property.arbitrary.bind10import io.kotest.property.arbitrary.default11import io.kotest.property.arbitrary.positiveInts12import io.kotest.property.arbitrary.string13import io.kotest.property.checkAll14class PropertyBasedTestingSpec : StringSpec() {15    data class Person(val name: String, val age: Int)16    init {17        "can do property-based testing - with 100 examples" {18            checkAll<String, String> { a, b ->19                (a + b) shouldHaveLength(a.length + b.length)20            }21        }22        // This does not work :-(23        /*24        "can run a defined number of tests" {25           forAll(100) { a: String, b: String ->26                (a + b).length shouldBe a.length + b.length27            }28        }29        */30        "generate the defaults for list" {31            val gen = Arb.default<List<Int>>()32            checkAll(10, gen) { list ->33                list.forAll { i ->34                    i.shouldBeInstanceOf<Int>()35                }36            }37        }38        "generate the defaults for set" {39            val gen = Arb.default<Set<String>>()40            checkAll(gen) { inst ->41                inst.forAll { i ->42                    i.shouldBeInstanceOf<String>()43                }44            }45        }46        "string size" {47            checkAll<String, String> { a, b ->48                (a + b) shouldHaveLength(a.length + b.length)49            }50        }51        "person generator" {52            val gen = Arb.bind(Arb.string(), Arb.positiveInts(), ::Person)53            checkAll(gen) {54                it.name shouldNotBe null55                it.age shouldBeGreaterThan(0)56            }57        }58    }59}...

RestaurantItemArb.kt

Source:RestaurantItemArb.kt

1/*2 * Jopiter APP3 * Copyright (C) 2021 Leonardo Colman Lopes4 *5 * This program is free software: you can redistribute it and/or modify6 * it under the terms of the GNU Affero General Public License as published by7 * the Free Software Foundation, either version 3 of the License, or8 * (at your option) any later version.9 *10 * This program is distributed in the hope that it will be useful,11 * but WITHOUT ANY WARRANTY; without even the implied warranty of12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the13 * GNU Affero General Public License for more details.14 *15 * You should have received a copy of the GNU Affero General Public License16 * along with this program.  If not, see <https://www.gnu.org/licenses/>.17 */18package app.jopiter.restaurants.model19import io.kotest.property.Arb20import io.kotest.property.arbitrary.arbitrary21import io.kotest.property.arbitrary.enum22import io.kotest.property.arbitrary.int23import io.kotest.property.arbitrary.list24import io.kotest.property.arbitrary.localDate25import io.kotest.property.arbitrary.long26import io.kotest.property.arbitrary.next27import io.kotest.property.arbitrary.orNull28import io.kotest.property.arbitrary.string29val restaurantItemArb = arbitrary {30    RestaurantItem(31        Arb.int(1, 100).next(),32        Arb.localDate().next(),33        Arb.enum<Period>().next(),34        Arb.long().orNull(0.1).next(),35        Arb.string(minSize = 1).next(),36        Arb.string(minSize = 1).next(),37        Arb.string(minSize = 1).next(),38        Arb.list(Arb.string(minSize = 1)).next(),39        Arb.string(minSize = 1).next(),40        Arb.string(1, 50).next()41    )42}...

PersonGenerator.kt

Source:PersonGenerator.kt

1package property.based.testing2import io.kotest.property.Arb3import io.kotest.property.arbitrary.Codepoint4import io.kotest.property.arbitrary.ascii5import io.kotest.property.arbitrary.bind6import io.kotest.property.arbitrary.cyrillic7import io.kotest.property.arbitrary.hebrew8import io.kotest.property.arbitrary.int9import io.kotest.property.arbitrary.katakana10import io.kotest.property.arbitrary.merge11import io.kotest.property.arbitrary.string12fun Arb.Companion.person(): Arb<Person> =13    Arb.bind(14        Arb.string(15            minSize = 1, codepoints = Codepoint.ascii()16                .merge(Codepoint.katakana())17                .merge(Codepoint.hebrew())18                .merge(Codepoint.cyrillic())19        ),20        Arb.address()21    ) { name, address ->22        Person(name, address)23    }24fun Arb.Companion.address(): Arb<Address> =25    Arb.bind(26        Arb.string(minSize = 1),27        Arb.string(minSize = 1),28        Arb.int(0..20000)29    ) { street, town, zip ->30        Address(street, town, zip)31    }...

io.kotest.property.arbitrary

Using AI Code Generation

1val nullClassArb = arbitrary { rs ->2if (rs.random.nextBoolean()) null else null3}4val nullClassArb = arbitrary { rs ->5if (rs.random.nextBoolean()) null else null6}7val nullClassArb = arbitrary { rs ->8if (rs.random.nextBoolean()) null else null9}10val nullClassArb = arbitrary { rs ->11if (rs.random.nextBoolean()) null else null12}13val nullClassArb = arbitrary { rs ->14if (rs.random.nextBoolean()) null else null15}16val nullClassArb = arbitrary { rs ->17if (rs.random.nextBoolean()) null else null18}19val nullClassArb = arbitrary { rs ->20if (rs.random.nextBoolean()) null else null21}22val nullClassArb = arbitrary { rs ->23if (rs.random.nextBoolean()) null else null24}25val nullClassArb = arbitrary { rs ->26if (rs.random.nextBoolean()) null else null27}28val nullClassArb = arbitrary { rs ->29if (rs.random.nextBoolean()) null else null30}31val nullClassArb = arbitrary { rs ->32if (rs.random.nextBoolean()) null else null33}34val nullClassArb = arbitrary { rs ->35if (rs.random.nextBoolean()) null else null36}37val nullClassArb = arbitrary { rs ->38if (rs.random.nextBoolean()) null else null39}

io.kotest.property.arbitrary

Using AI Code Generation

1val nullClassArb = nullClass.arb()2val nullClassGen = nullClassArb.generator(100)3val nullClassSample = nullClassGen.next()4println(nullClassSample)5val nullClassArb = nullClass.arb()6val nullClassGen = nullClassArb.generator(100)7val nullClassSample = nullClassGen.next()8println(nullClassSample)9val nullClassArb = nullClass.arb()10val nullClassGen = nullClassArb.generator(100)11val nullClassSample = nullClassGen.next()12println(nullClassSample)13val nullClassArb = nullClass.arb()14val nullClassGen = nullClassArb.generator(100)15val nullClassSample = nullClassGen.next()16println(nullClassSample)17val nullClassArb = nullClass.arb()18val nullClassGen = nullClassArb.generator(100)19val nullClassSample = nullClassGen.next()20println(nullClassSample)21val nullClassArb = nullClass.arb()22val nullClassGen = nullClassArb.generator(100)23val nullClassSample = nullClassGen.next()24println(nullClassSample)25val nullClassArb = nullClass.arb()26val nullClassGen = nullClassArb.generator(100)27val nullClassSample = nullClassGen.next()28println(nullClassSample)29val nullClassArb = nullClass.arb()30val nullClassGen = nullClassArb.generator(100)31val nullClassSample = nullClassGen.next()32println(nullClassSample)

io.kotest.property.arbitrary

Using AI Code Generation

1import io.kotest.property.arbitrary.null2import io.kotest.property.forAll3class ExamplePropertyBasedTesting {4    fun propertyBasedTesting() {5        forAll { property: Property ->6            property.forAll { list: List<Int> ->

io.kotest.property.arbitrary

Using AI Code Generation

1val arb = Arb .nullClass ( )2val result = arb .next ( RandomSource .default ( ) )3val arb = Arb .nullClass ( )4val result = arb .next ( RandomSource .default ( ) )5val arb = Arb .nullClass ( )6val result = arb .next ( RandomSource .default ( ) )7val arb = Arb .nullClass ( )8val result = arb .next ( RandomSource .default ( ) )9val arb = Arb .nullClass ( )10val result = arb .next ( RandomSource .default ( ) )11val arb = Arb .nullClass ( )12val result = arb .next ( RandomSource .default ( ) )13val arb = Arb .nullClass ( )14val result = arb .next ( RandomSource .default ( ) )15val arb = Arb .nullClass ( )16val result = arb .next ( RandomSource .default ( ) )17val arb = Arb .nullClass ( )18val result = arb .next ( RandomSource .default ( ) )19val arb = Arb .nullClass ( )20val result = arb .next ( RandomSource .default ( ) )21val arb = Arb .nullClass ( )22val result = arb .next ( RandomSource .default ( ) )23val arb = Arb .nullClass ( )24val result = arb .next ( RandomSource .default ( ) )

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