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How to use shrink method of io.kotest.property.arbitrary.floats class

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

Arb.kt

Source:Arb.kt

...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) }...

floats.kt

Source:floats.kt

...5import kotlin.math.absoluteValue6private val numericEdgeCases = listOf(-1.0F, -Float.MIN_VALUE, -0.0F, 0.0F, Float.MIN_VALUE, 1.0F)7private val nonFiniteEdgeCases = listOf(Float.NEGATIVE_INFINITY, Float.NaN, Float.POSITIVE_INFINITY)8object FloatShrinker : Shrinker<Float> {9   override fun shrink(value: Float): List<Float> =10      if (value == 0f || !value.isFinite() || value.absoluteValue < 10 * Float.MIN_VALUE)11         emptyList()12      else13         listOfNotNull(DoubleShrinker.shrink(value.toString())?.toFloat())14}15/**16 * Returns an [Arb] that produces [Float]s from [min] to [max] (inclusive).17 * The edge cases are [Float.NEGATIVE_INFINITY], [min], -1.0, -[Float.MIN_VALUE], -0.0, 0.0, [Float.MIN_VALUE], 1.0,18 * [max], [Float.POSITIVE_INFINITY] and [Float.NaN] which are only included if they are in the provided range.19 *20 * @see numericFloat to only produce numeric [Float]s21 */22fun Arb.Companion.float(min: Float = -Float.MAX_VALUE, max: Float = Float.MAX_VALUE): Arb<Float> = float(min..max)23/**24 * Returns an [Arb] that produces [Float]s in [range].25 * The edge cases are [Float.NEGATIVE_INFINITY], [ClosedFloatingPointRange.start], -1.0, -[Float.MIN_VALUE], -0.0,26 * 0.0, [Float.MIN_VALUE], 1.0, [ClosedFloatingPointRange.endInclusive], [Float.POSITIVE_INFINITY] and [Float.NaN] which27 * are only included if they are in the provided range....

shrink

Using AI Code Generation

1) : Arbitrary<Float> {2    override fun edgecases(): List<Float> = emptyList()3    override fun sample(rs: RandomSource): Sample<Float> {4        val value = rs.random.nextFloat(range.start, range.endInclusive)5        return Sample(value, shrinker.shrink(value))6    }7}8) : Arbitrary<Int> {9    override fun edgecases(): List<Int> = emptyList()10    override fun sample(rs: RandomSource): Sample<Int> {11        val value = rs.random.nextInt(range)12        return Sample(value, shrinker.shrink(value))13    }14}15) : Arbitrary<Long> {16    override fun edgecases(): List<Long> = emptyList()17    override fun sample(rs: RandomSource): Sample<Long> {18        val value = rs.random.nextLong(range)19        return Sample(value, shrinker.shrink(value))20    }21}22) : Arbitrary<Short> {23    override fun edgecases(): List<Short> = emptyList()24    override fun sample(rs: RandomSource): Sample<Short> {25        val value = rs.random.nextInt(range).toShort()26        return Sample(value, shrinker.shrink(value))27    }28}29) : Arbitrary<String> {30    override fun edgecases(): List<String> = emptyList()31    override fun sample(rs: RandomSource): Sample<String> {32        val value = rs.random.nextString(range, charRange, allowedChars)33        return Sample(value, shrinker.shrink(value))34    }35}

shrink

Using AI Code Generation

1    val shrinker = Floats.shrinker(0.0f, 100.0f)2    val shrinker = Ints.shrinker(0, 100)3class Foo(val i: Int) {4      fun bar() = i + 15    }6    class FooTest : WordSpec() {7      init {8        "Foo.bar" should {9          "always return 1 more than the input" {10            forAll<Int> { i ->11              Foo(i).bar() == i + 112            }13          }14        }15      }16    }

shrink

Using AI Code Generation

1val floatArb = Arb.floats(0.0f, 1.0f)2val shrinkable = floatArb.shrink(0.5f)3shrinkable.shrinks().first().value shouldBe 0.25f4shrinkable.shrinks().first().shrinks().first().value shouldBe 0.125f5shrinkable.shrinks().first().shrinks().first().shrinks().first().value shouldBe 0.0625f6shrinkable.shrinks().first().shrinks().first().shrinks().first().shrinks().first().value shouldBe 0.03125f7shrinkable.shrinks().first().shrinks().first().shrinks().first().shrinks().first().shrinks().first().value shouldBe 0.015625f8shrinkable.shrinks().first().shrinks().first().shrinks().first().shrinks().first().shrinks().first().shrinks().first().value shouldBe 0.0078125f9shrinkable.shrinks().first().shrinks().first().shrinks

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