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• 4.4.3
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• prelude.kt

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jvmMain.io.kotest.assertions.arrow.prelude.kt Maven / Gradle / Ivy

package io.kotest.assertions.arrow

import arrow.Kind
import arrow.typeclasses.ApplicativeError
import io.kotest.matchers.Matcher
import io.kotest.matchers.MatcherResult
import kotlin.random.Random

internal fun  matcher(
  passed: Boolean,
  msg: String,
  negatedFailureMsg: String = msg
): Matcher =
  object : Matcher {
    override fun test(value: A): MatcherResult = MatcherResult(passed, msg, negatedFailureMsg)
  }

/**
 * Polymorphic chooser that distributes generation of arbitrary higher kinded values
 * where [F] provides extensions for the [ApplicativeError] interface.
 * The chooser dispatches returns an error or value in the context of [F]
 */
fun  ApplicativeError.choose(fe: () -> E, fa: () -> A): Kind =
  if (Random.nextBoolean()) raiseError(fe()) else just(fa())