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

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

Arb.kt

Source:Arb.kt Github

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...23 range: IntRange = 0..10024): Arb<Array<A>> {25 check(!range.isEmpty())26 check(range.first >= 0)27 return arb(edgecases = listOf(emptyArray<A>()) + gen.edgecases().map { arrayOf(it) }) {28 sequence {29 val genIter = gen.generate(it).iterator()30 while (true) {31 val targetSize = it.random.nextInt(range)32 val list = ArrayList<A>(targetSize)33 while (list.size < targetSize && genIter.hasNext()) {34 list.add(genIter.next().value)35 }36 check(list.size == targetSize)37 yield(list.toArray() as Array<A>)38 }39 }40 }41}42@PublishedApi43internal fun <A, B> arrayChunkGenerator(44 arb: Arb<A>,45 shrinker: Shrinker<B>,46 range: IntRange = 0..10,47 build: (values: List<A>, offset: Int, length: Int) -> B48): Arb<B> {49 check(!range.isEmpty())50 check(range.first >= 0)51 val edgecases =52 arb.edgecases().map { a -> build(listOf(a), 0, 1) } + build(emptyList(), 0, 0)53 return arb(edgecases, shrinker) {54 val genIter = arb.generate(it).iterator()55 sequence {56 while (true) {57 val targetSize = it.random.nextInt(range)58 val list = ArrayList<A>(targetSize)59 while (list.size < targetSize && genIter.hasNext()) {60 list.add(genIter.next().value)61 }62 val offset = (0..list.size).random(it.random)63 val length = (0..(list.size - offset)).random(it.random)64 yield(build(list, offset, length))65 }66 }67 }68}69class ChunkShrinker<A> : Shrinker<Chunk<A>> {70 override fun shrink(value: Chunk<A>): List<Chunk<A>> =71 if (value.isEmpty()) emptyList()72 else listOf(73 Chunk.empty(),74 value.takeLast(1),75 value.take(value.size() / 3),76 value.take(value.size() / 2),77 value.take(value.size() * 2 / 3),78 value.dropLast(1)79 )80}81inline fun <reified A> Arb.Companion.chunk(arb: Arb<A>): Arb<Chunk<A>> =82 object : Arb<Chunk<A>>() {83 override fun edgecases(): List<Chunk<A>> =84 listOf(Chunk.empty<A>()) + arb.edgecases().map { Chunk(it) }85 override fun values(rs: RandomSource): Sequence<Sample<Chunk<A>>> =86 Arb.choose(87 5 to arb.map { Chunk.just(it) },88 10 to Arb.list(arb, 0..20).map { Chunk.iterable(it) },89 10 to Arb.set(arb, 0..20).map { Chunk.iterable(it) },90 10 to Arb.array(arb, 0..20).map { Chunk.array(it) },91 10 to Arb.boxedChunk(arb)92 ).values(rs)93 }94inline fun <reified A> Arb.Companion.boxedChunk(arb: Arb<A>): Arb<Chunk<A>> =95 object : Arb<Chunk<A>>() {96 override fun edgecases(): List<Chunk<A>> =97 listOf(Chunk.empty<A>()) + arb.edgecases().map { Chunk(it) }98 override fun values(rs: RandomSource): Sequence<Sample<Chunk<A>>> =99 arrayChunkGenerator(arb, ChunkShrinker()) { values, offset, length ->100 Chunk.boxed(values.toTypedArray(), offset, length)101 }.values(rs)102 }103fun Arb.Companion.booleanChunk(): Arb<Chunk<Boolean>> =104 object : Arb<Chunk<Boolean>>() {105 override fun edgecases(): List<Chunk<Boolean>> =106 listOf(Chunk.empty<Boolean>()) + Arb.bool().edgecases().map { Chunk(it) }107 override fun values(rs: RandomSource): Sequence<Sample<Chunk<Boolean>>> =108 Arb.choice(109 arrayChunkGenerator(Arb.bool(), ChunkShrinker()) { values, offset, length ->110 Chunk.booleans(values.toBooleanArray(), offset, length)111 },112 arrayChunkGenerator(Arb.bool(), ChunkShrinker()) { values, _, _ ->113 Chunk.array(values.toTypedArray())114 }115 ).values(rs)116 }117fun Arb.Companion.byteChunk(): Arb<Chunk<Byte>> =118 object : Arb<Chunk<Byte>>() {119 override fun edgecases(): List<Chunk<Byte>> =120 listOf(Chunk.empty<Byte>()) + Arb.byte().edgecases().map { Chunk(it) }121 override fun values(rs: RandomSource): Sequence<Sample<Chunk<Byte>>> =122 Arb.choice(123 arrayChunkGenerator(Arb.byte(), ChunkShrinker()) { values, offset, length ->124 Chunk.bytes(values.toByteArray(), offset, length)125 },126 arrayChunkGenerator(Arb.byte(), ChunkShrinker()) { values, _, _ ->127 Chunk.array(values.toTypedArray())128 }129 ).values(rs)130 }131fun Arb.Companion.intChunk(): Arb<Chunk<Int>> =132 object : Arb<Chunk<Int>>() {133 override fun edgecases(): List<Chunk<Int>> =134 listOf(Chunk.empty<Int>()) + Arb.int().edgecases().map { Chunk(it) }135 override fun values(rs: RandomSource): Sequence<Sample<Chunk<Int>>> =136 Arb.choice(137 arrayChunkGenerator(Arb.int(), ChunkShrinker()) { values, offset, length ->138 Chunk.ints(values.toIntArray(), offset, length)139 },140 arrayChunkGenerator(Arb.int(), ChunkShrinker()) { values, _, _ ->141 Chunk.array(values.toTypedArray())142 }143 ).values(rs)144 }145fun Arb.Companion.longChunk(): Arb<Chunk<Long>> =146 object : Arb<Chunk<Long>>() {147 override fun edgecases(): List<Chunk<Long>> =148 listOf(Chunk.empty<Long>()) + Arb.long().edgecases().map { Chunk(it) }149 override fun values(rs: RandomSource): Sequence<Sample<Chunk<Long>>> =150 Arb.choice(151 arrayChunkGenerator(Arb.long(), ChunkShrinker()) { values, offset, length ->152 Chunk.longs(values.toLongArray(), offset, length)153 },154 arrayChunkGenerator(Arb.long(), ChunkShrinker()) { values, _, _ ->155 Chunk.array(values.toTypedArray())156 }157 ).values(rs)158 }159fun Arb.Companion.doubleChunk(): Arb<Chunk<Double>> =160 object : Arb<Chunk<Double>>() {161 override fun edgecases(): List<Chunk<Double>> =162 listOf(Chunk.empty<Double>()) + Arb.double().edgecases().map { Chunk(it) }163 override fun values(rs: RandomSource): Sequence<Sample<Chunk<Double>>> =164 Arb.choice(165 arrayChunkGenerator(Arb.double(), ChunkShrinker()) { values, offset, length ->166 Chunk.doubles(values.toDoubleArray(), offset, length)167 },168 arrayChunkGenerator(Arb.double(), ChunkShrinker()) { values, _, _ ->169 Chunk.array(values.toTypedArray())170 }171 ).values(rs)172 }173fun Arb.Companion.floatChunk(): Arb<Chunk<Float>> =174 object : Arb<Chunk<Float>>() {175 override fun edgecases(): List<Chunk<Float>> =176 listOf(Chunk.empty<Float>()) + Arb.float().edgecases().map { Chunk(it) }177 override fun values(rs: RandomSource): Sequence<Sample<Chunk<Float>>> =178 Arb.choice(179 arrayChunkGenerator(Arb.float(), ChunkShrinker()) { values, offset, length ->180 Chunk.floats(values.toFloatArray(), offset, length)181 },182 arrayChunkGenerator(Arb.float(), ChunkShrinker()) { values, _, _ ->183 Chunk.array(values.toTypedArray())184 }185 ).values(rs)186 }187fun Arb.Companion.shortChunk(): Arb<Chunk<Short>> =188 object : Arb<Chunk<Short>>() {189 override fun edgecases(): List<Chunk<Short>> =190 listOf(Chunk.empty<Short>()) + Arb.short().edgecases().map { Chunk(it) }191 override fun values(rs: RandomSource): Sequence<Sample<Chunk<Short>>> =192 Arb.choice(193 arrayChunkGenerator(Arb.short(), ChunkShrinker()) { values, offset, length ->194 Chunk.shorts(values.toShortArray(), offset, length)195 },196 arrayChunkGenerator(Arb.short(), ChunkShrinker()) { values, _, _ ->197 Chunk.array(values.toTypedArray())198 }199 ).values(rs)200 }...

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StringTest.kt

Source:StringTest.kt Github

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1import io.kotest.matchers.shouldBe2import io.kotest.property.Arb3import io.kotest.property.RandomSource4import io.kotest.property.arbitrary.Codepoint5import io.kotest.property.arbitrary.arabic6import io.kotest.property.arbitrary.arbitrary7import io.kotest.property.arbitrary.asString8import io.kotest.property.arbitrary.ascii9import io.kotest.property.arbitrary.egyptianHieroglyphs10import io.kotest.property.arbitrary.string11import io.kotest.property.arbitrary.take12import io.kotest.property.checkAll13import io.harmor.msgpack.internal.MessageType.FIXSTRING14import io.harmor.msgpack.internal.MessageType.STRING1615import io.harmor.msgpack.internal.MessageType.STRING3216import io.harmor.msgpack.internal.MessageType.STRING817import io.harmor.msgpack.nextString18import io.harmor.msgpack.StringValue19import io.harmor.msgpack.msgpack.str20import utils.TypedElement21import utils.MessagePackerFactory22import utils.MessageUnpackerFactory23import utils.bytes24import utils.pack25import utils.plus26import utils.convert27import utils.with28import kotlin.experimental.or29import kotlin.random.nextInt30class StringTest : AbstractMessagePackTest() {31 init {32 "Packer" should {33 "use fixstr" {34 checkAll(byteString(0..31)) {35 it with packer shouldBe fixstr(it)36 }37 }38 "use str8" {39 checkAll(byteString(32..255)) {40 it with packer shouldBe str8(it)41 }42 }43 "use str16" {44 checkAll(100, byteString(256..65535)) {45 it with packer shouldBe str16(it)46 }47 }48 "use str32" {49 checkAll(100, byteString(65536..100_000)) {50 it with packer shouldBe str32(it)51 }52 }53 }54 "Unpacker" should {55 "decode fixstr" {56 checkAll(byteString(0..31)) {57 str(it) with unpacker shouldBe str(it)58 }59 }60 "decode str8" {61 checkAll(100, byteString(32..255)) {62 str(it) with unpacker shouldBe str(it)63 }64 }65 "decode str16" {66 checkAll(100, byteString(256..65535)) {67 str(it) with unpacker shouldBe str(it)68 }69 }70 "decode str32" {71 checkAll(100, byteString(65536..100_000)) {72 str(it) with unpacker shouldBe str(it)73 }74 }75 "decode utf-8" {76 checkAll(100, Arb.string(0..100_000, Arb.arabic() + Arb.egyptianHieroglyphs())) {77 str(it) with unpacker shouldBe str(it)78 }79 }80 }81 }82}83private fun byteString(bytes: IntRange, codepoint: Arb<Codepoint> = Arb.ascii()): Arb<String> {84 val edgeCases = listOf(codepoint.toString(bytes.first), codepoint.toString(bytes.last))85 return arbitrary(edgeCases) { rs ->86 val count = rs.random.nextInt(bytes)87 codepoint.toString(count, rs)88 }89}90fun Arb<Codepoint>.toString(count: Int, rs: RandomSource = RandomSource.Default) =91 take(count, rs).joinToString("") { it.asString() }92private fun fixstr(value: String) = TypedElement(FIXSTRING.first.toByte() or value.bytes.toByte(), str(value))93private fun str8(value: String) = TypedElement(STRING8, str(value))94private fun str16(value: String) = TypedElement(STRING16, str(value))95private fun str32(value: String) = TypedElement(STRING32, str(value))96infix fun StringValue.with(unpacker: MessageUnpackerFactory): StringValue =97 unpacker(convert().pack()).nextString()98infix fun String.with(packerFactory: MessagePackerFactory): TypedElement =99 StringValue(this) with packerFactory...

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StreamSpec.kt

Source:StreamSpec.kt Github

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...27 init {28 spec()29 }30 fun Arb.Companion.long(range: LongRange = Long.MIN_VALUE..Long.MAX_VALUE): Arb<Long> {31 val edgecases = listOf(0L, 1, -1, Long.MAX_VALUE, Long.MIN_VALUE).filter { it in range }32 return arb(LongShrinker(range), edgecases) { it.random.nextLong(range.first, range.last) }33 }34 class LongShrinker(private val range: LongRange) : Shrinker<Long> {35 override fun shrink(value: Long): List<Long> =36 when (value) {37 0L -> emptyList()38 1L, -1L -> listOf(0)39 else -> {40 val a = listOf(abs(value), value / 3, value / 2, value * 2 / 3)41 val b = (1..5L).map { value - it }.reversed().filter { it > 0 }42 (a + b).distinct().filter { it in range && it != value }43 }44 }45 }46 inline fun <reified O, R> Arb.Companion.pull(...

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ItemGens.kt

Source:ItemGens.kt Github

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...28 /**29 * Edgecases for the minimum and maximum values, as well as some that30 * are centered around the expiration date of 0.31 */32 private val edgecases: List<Int> = (-2..2) + (Int.MAX_VALUE - 1) + (Int.MIN_VALUE + 1)33 // note- ignore integer overflow for now34 val nonExpired = Arb.intEdgecases(1, Int.MAX_VALUE - 1, edgecases)35 val expired = Arb.intEdgecases(Int.MIN_VALUE + 1, 0, edgecases)36 val any = Arb.intEdgecases(Int.MIN_VALUE + 1 until Int.MAX_VALUE, edgecases)37 }38 object Quality {39 val regularValidRange = 0..5040 /** Some additional edgecases around the min/max quality range */41 private val edgecases: List<Int> =42 regularValidRange.first.let { (it - 3)..(it + 3) } +43 regularValidRange.last.let { (it - 3)..(it + 3) }44 val any = Arb.intEdgecases(Int.MIN_VALUE + 1 until Int.MAX_VALUE, edgecases)45 val validRegular = Arb.intEdgecases(regularValidRange, edgecases)46 // note- ignore integer overflow for now47 val invalidRegular = any.filterNot { it in regularValidRange }48 }49 object Binds {50 fun itemArb(51 nameGen: Gen<String> = Names.all,52 sellInGen: Gen<Int> = SellIn.any,53 qualityGen: Gen<Int> = Quality.any,54 ) = Arb.bind(nameGen, sellInGen, qualityGen) { name, sellIn, quality ->55 Item(name, sellIn, quality)56 }57 }58}...

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KotestConfig.kt

Source:KotestConfig.kt Github

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...31 min: Int = Int.MIN_VALUE,32 max: Int = Int.MAX_VALUE,33 additionalEdgecases: List<Int> = emptyList(),34 ) = Arb.intEdgecases(min..max, additionalEdgecases)35 /** Helper method to initialise a [Arb.Companion.int] with some edgecases. */36 fun Arb.Companion.intEdgecases(37 range: IntRange = Int.MIN_VALUE..Int.MAX_VALUE,38 additionalEdgecases: List<Int> = emptyList(),39 ): Arb<Int> {40 val edgecases =41 (42 listOf(-1, 0, 1, range.first, range.last, Int.MIN_VALUE, Int.MAX_VALUE) +43 additionalEdgecases44 ).filter { it in range }45 return arbitrary(edgecases, IntShrinker(range)) { it.random.nextInt(range) }46 }47 }48}...

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PulsarUrnTest.kt

Source:PulsarUrnTest.kt Github

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1package com.octaldata.session.pulsar2import com.octaldata.domain.topics.TopicName3import com.octaldata.domain.structure.DataRecordUrn4import io.kotest.core.spec.style.FunSpec5import io.kotest.matchers.shouldBe6import io.kotest.property.Arb7import io.kotest.property.arbitrary.positiveInt8import io.kotest.property.arbitrary.positiveLong9import io.kotest.property.arbitrary.string10import io.kotest.property.arbitrary.withEdgecases11import io.kotest.property.checkAll12class PulsarUrnTest : FunSpec({13 test("parse urn") {14 checkAll(15 100,16 Arb.string(1, 100),17 Arb.positiveInt().withEdgecases(-1),18 Arb.positiveLong().withEdgecases(-1),19 Arb.positiveLong().withEdgecases(-1),20 ) { topic, part, ledge, entryId ->21 parseUrn(DataRecordUrn("urn:pulsar:$topic:$part:$ledge:$entryId")).getOrThrow() shouldBe22 MessageIdentifier(TopicName(topic), part, ledge, entryId)23 }24 }25})...

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MD5Test.kt

Source:MD5Test.kt Github

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1package com.github.durun.nitron.core2import io.kotest.core.spec.style.FreeSpec3import io.kotest.matchers.shouldBe4import io.kotest.property.Arb5import io.kotest.property.arbitrary.edgecases6import io.kotest.property.arbitrary.string7class MD5Test : FreeSpec({8 "toString" {9 val testData = Arb.string().edgecases() + listOf("hogehoge")10 testData.forEach {11 val md5 = MD5.digest("hogehoge")12 println(md5.toString())13 println(md5.toStringOld())14 md5.toString() shouldBe md5.toStringOld()15 }16 }17})18private fun MD5.toStringOld(): String = String.format(19 "%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x",20 bytes[0], bytes[1], bytes[2], bytes[3], bytes[4], bytes[5], bytes[6], bytes[7],21 bytes[8], bytes[9], bytes[10], bytes[11], bytes[12], bytes[13], bytes[14], bytes[15]22)...

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RemoteDataGen.kt

Source:RemoteDataGen.kt Github

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1package com.github.torresmi.remotedata.test.util.generation2import com.github.torresmi.remotedata.RemoteData3import io.kotest.property.Arb4import io.kotest.property.arbitrary.choice5import io.kotest.property.arbitrary.map6import io.kotest.property.arbitrary.next7fun <E : Any, A : Any> Arb.Companion.remoteData(failureGen: Arb<E>, successGen: Arb<A>) = Arb.choice(8 successGen.map { RemoteData.succeed(it) },9 failureGen.map { RemoteData.fail(it) }10).plusEdgecases(11 RemoteData.NotAsked,12 RemoteData.Loading,13 RemoteData.succeed(successGen.next()),14 RemoteData.fail(failureGen.next())15)16fun <E : Any> Arb.Companion.remoteDataNonSuccess(failureGen: Arb<E>) = failureGen.map { RemoteData.fail(it) }17 .plusEdgecases(18 RemoteData.NotAsked,19 RemoteData.Loading20 )...

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edgecases

Using AI Code Generation

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1val edgeCases = EdgeCases.of(1, 2, 3, 4, 5, 6, 7, 8, 9, 10)2val arb = Arb.int(1..10, edgeCases)3val ints = arb.take(100).toList()4println(ints)5enum class Suit { CLUBS, DIAMONDS, HEARTS, SPADES }6val arbSuit = Arb.enum<Suit>()7val suits = arbSuit.take(10).toList()8println(suits)

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edgecases

Using AI Code Generation

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1val edgecases = EdgeCases.of(1, 2, 3, 4, 5)2val arb = Arb.int(edgecases)3val arb = Arb.int().frequency(41 to Arb.int(1..10),52 to Arb.int(11..20),63 to Arb.int(21..30)7val arb = Arb.int().frequency(81 to Arb.int(1..10),92 to Arb.int(11..20),103 to Arb.int(21..30)11val arb = Arb.int().frequency(121 to Arb.int(1..10),132 to Arb.int(11..20),143 to Arb.int(21..30)15val arb = Arb.int().frequency(161 to Arb.int(1..10),172 to Arb.int(11..20),183 to Arb.int(21..30)19val arb = Arb.int().frequency(201 to Arb.int(1..10),212 to Arb.int(11..20),223 to Arb.int(21..30)23val arb = Arb.int().frequency(241 to Arb.int(1..10),252 to Arb.int(11..20),263 to Arb.int(21..30)27val arb = Arb.int().frequency(281 to Arb.int(1..10),292 to Arb.int(11..20),303 to Arb.int(21..30)31val arb = Arb.int().frequency(321 to Arb.int(1..10),332 to Arb.int(11..20),343 to Arb.int(21..30)35val arb = Arb.int().frequency(361 to Arb.int(1..10),372 to Arb.int(11..20),383 to Arb.int(21..30)

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edgecases

Using AI Code Generation

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1 val edgeCases = EdgeCases.of("foo", "bar", "baz")2 val arb = Arb.string().withEdgecases(edgeCases)3 val sample = arb.sample(rs, 100)4 sample should containAll(edgeCases.values)5 }6 }7}8class StringLengthTest : WordSpec() {9 init {10 "string length" should {11 "be between 0 and 100" {12 checkAll<String> { s ->13 s.length shouldBe between(0, 100)14 }15 }16 }17 }18}19class StringLengthTest : WordSpec() {20 init {21 "string length" should {22 "be between 0 and 100" {23 checkAll<String> { s ->24 s.length shouldBe between(0, 100)25 }.edgecases(edgecases = listOf("", "a".repeat(100)))26 }27 }28 }29}

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