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How to use Arb.modifyEdgecases method of io.kotest.property.arbitrary.edgecases class

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

edgecases.kt

Source:edgecases.kt

1package io.kotest.property.arbitrary2import io.kotest.property.Arb3import io.kotest.property.EdgeConfig4import io.kotest.property.RandomSource5import io.kotest.property.Sample6/**7 * Randomly chooses an [Arb] and then generates an edge case from that [Arb].8 * If the chosen arb has no edge cases, then another arb will be chosen.9 * If all [Arb]s have no edge cases, then returns null.10 */11tailrec fun <A> List<Arb<A>>.edgecase(rs: RandomSource): A? {12   if (this.isEmpty()) return null13   val shuffled = this.shuffled(rs.random)14   return when (val edge = shuffled.first().edgecase(rs)) {15      null -> this.drop(1).edgecase(rs)16      else -> edge17   }18}19/**20 * Collects the edge cases from this arb.21 * Will stop after the given number of iterations.22 * This function is mainly used for testing.23 */24fun <A> Arb<A>.edgecases(iterations: Int = 100, rs: RandomSource = RandomSource.default()): Set<A> =25   generate(rs, EdgeConfig(edgecasesGenerationProbability = 1.0))26      .take(iterations)27      .map { it.value }28      .toSet()29/**30 * Returns a new [Arb] with the supplied edge cases replacing any existing edge cases.31 */32fun <A> Arb<A>.withEdgecases(edgecases: List<A>): Arb<A> = arbitrary(edgecases) { this@withEdgecases.next(it) }33/**34 * Returns a new [Arb] with the supplied edge cases replacing any existing edge cases.35 */36fun <A> Arb<A>.withEdgecases(vararg edgecases: A): Arb<A> = this.withEdgecases(edgecases.toList())37fun <A> Arb<A>.removeEdgecases(): Arb<A> = this.withEdgecases(emptyList())38/**39 * Returns a new [Arb] with the edge cases from this arb transformed by the given function [f].40 */41fun <A> Arb<A>.modifyEdgecases(f: (A) -> A?): Arb<A> = object : Arb<A>() {42   override fun edgecase(rs: RandomSource): A? = this@modifyEdgecases.edgecase(rs)?.let(f)43   override fun sample(rs: RandomSource): Sample<A> = this@modifyEdgecases.sample(rs)44}...

WithEdgecasesTest.kt

Source:WithEdgecasesTest.kt

1package com.sksamuel.kotest.property.arbitrary2import io.kotest.core.spec.style.FunSpec3import io.kotest.matchers.collections.shouldContainExactlyInAnyOrder4import io.kotest.property.arbitrary.arbitrary5import io.kotest.property.arbitrary.edgecases6import io.kotest.property.arbitrary.modifyEdgecases7import io.kotest.property.arbitrary.withEdgecases8class WithEdgecasesTest : FunSpec({9   context("Arb<A>.withEdgecases") {10      test("should override the initial edge cases") {11         val arbInt = arbitrary(listOf(1)) { it.random.nextInt() }12         arbInt.withEdgecases(2, 3).edgecases() shouldContainExactlyInAnyOrder listOf(2, 3)13      }14      test("should override the initial edge cases when specified a list") {15         val arbInt = arbitrary(listOf(1)) { it.random.nextInt() }16         arbInt.withEdgecases(listOf(2, 3)).edgecases() shouldContainExactlyInAnyOrder listOf(2, 3)17      }18   }19   context("Arb<A>.modifyEdgecases") {20      test("should modify the each edge case") {21         val arbInt = arbitrary(listOf(1, 2, 3)) { it.random.nextInt() }22         arbInt.modifyEdgecases { it * 2 }.edgecases() shouldContainExactlyInAnyOrder listOf(2, 4, 6)23      }24   }25})...

Arb.modifyEdgecases

Using AI Code Generation

1    Arb.modifyEdgecases { it + listOf(1, 2, 3) }2    Arb.modifyEdgecases { it + listOf(1, 2, 3) }3    Arb.modifyEdgecases { it + listOf(1, 2, 3) }4    Arb.modifyEdgecases { it + listOf(1, 2, 3) }5    Arb.modifyEdgecases { it + listOf(1, 2, 3) }6    Arb.modifyEdgecases { it + listOf(1, 2, 3) }7    Arb.modifyEdgecases { it + listOf(1, 2, 3) }8    Arb.modifyEdgecases { it + listOf(1, 2, 3) }9    Arb.modifyEdgecases { it + listOf(1, 2, 3) }10    Arb.modifyEdgecases { it + listOf(1, 2, 3) }11    Arb.modifyEdgecases { it + listOf(1, 2, 3) }12    Arb.modifyEdgecases { it + listOf(1, 2, 3) }13    Arb.modifyEdgecases {

Arb.modifyEdgecases

Using AI Code Generation

1val arb = Arb.int(1..10).modifyEdgecases { it + 100 }2val arb = Arb.int(1..10).modifyEdgecases { it + 100 }3val arb = Arb.int(1..10).modifyEdgecases { it + 100 }4val arb = Arb.int(1..10).modifyEdgecases { it + 100 }5val arb = Arb.int(1..10).modifyEdgecases { it + 100 }6val arb = Arb.int(1..10).modifyEdgecases { it + 100 }7val arb = Arb.int(1..10).modifyEdgecases { it + 100 }8val arb = Arb.int(1..10).modifyEdgecases { it + 100 }9val arb = Arb.int(1..10).modifyEdgecases { it + 100 }10val arb = Arb.int(1..10).modifyEdgecases { it + 100 }

Arb.modifyEdgecases

Using AI Code Generation

1+class MyEdgeCases : Arb<Int> {2+   override fun edgecases(): List<Int> {3+      return listOf(0, 1, 2, 3, 4, 5, 6, 7, 8, 9)4+   }5+   override fun edgecase(rs: RandomSource): Int? {6+      return edgecases().random(rs.random)7+   }8+   override fun sample(rs: RandomSource): Sample<Int> {9+      return Sample(rs.random.nextInt())10+   }11+}12+class EdgeCasesTest : WordSpec({13+   "Arb.modifyEdgecases" should {14+      "use the provided edge cases" {15+         forAll(MyEdgeCases().modifyEdgecases { it + 10 }) { n ->16+         }17+      }18+   }19+})20+import io.kotest.core.spec.style.WordSpec21+import io.kotest.matchers.ints.shouldBeGreaterThanOrEqual22+import io.kotest.matchers.ints.shouldBeLessThanOrEqual23+import io.kotest.property.Arb24+import io.kotest.property.arbitrary.int25+import io.kotest.property.arbitrary.modifyEdgecases26+import io.kotest.property.forAll27+class EdgeCasesTest : WordSpec({28+   "Arb.modifyEdgecases" should {29+      "use the provided edge cases" {30+         forAll(Arb.int().modifyEdgecases { it + 10 }) { n ->31+         }32+      }33+   }34+})

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