How to use ErrorCollector.pushErrorAndMaybeThrow method of io.kotest.assertions.errorAndAssertionsScope class

Best Kotest code snippet using io.kotest.assertions.errorAndAssertionsScope.ErrorCollector.pushErrorAndMaybeThrow

errorAndAssertionsScope.kt

Source: errorAndAssertionsScope.kt Github

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1package io.kotest.assertions2import io.kotest.common.ExperimentalKotest3import kotlinx.coroutines.withContext4import kotlin.coroutines.AbstractCoroutineContextElement5import kotlin.coroutines.CoroutineContext6import kotlin.coroutines.coroutineContext7internal typealias Failures = List<Throwable>8internal typealias Assertions = Int9internal class AssertionBlockContextElement : AbstractCoroutineContextElement(Key) {10 companion object Key : CoroutineContext.Key<AssertionBlockContextElement>11}12/​**13 * [errorAndAssertionsScope] runs [block] in a "clean" scope.14 * The original error and assertion counts are stored and set to empty before the [block] is run.15 * Once the block is executed, the result [T], the [Failures], and the number of [Assertions] are stored for return.16 * The original error and assertion counts are replaced into their respective tracking systems [errorCollector] and [assertionCounter].17 *18 * The calling function is responsible for inserting the resultant [Failures] and [Assertions] into [errorCollector] and [assertionCounter] if appropriate.19 *20 * @return The result [T] of the block function, the [Failures] that block had, and the number of [Assertions] executed.21 */​22@ExperimentalKotest23internal suspend fun <T> errorAndAssertionsScope(block: suspend () -> T): Triple<Result<T>, Failures, Assertions> {24 if (coroutineContext[AssertionBlockContextElement] != null) {25 throw IllegalStateException("Assertion block functions one, any, and all are limited to a depth of 1")26 }27 val originalFailures = errorCollector.getAndReplace(listOf())28 val originalAssertions = assertionCounter.getAndReset()29 val originalMode = errorCollector.getCollectionMode()30 errorCollector.setCollectionMode(ErrorCollectionMode.Soft)31 val result = runCatching {32 withContext(AssertionBlockContextElement()) {33 block()34 }35 }36 errorCollector.setCollectionMode(originalMode)37 val resultFailures = errorCollector.getAndReplace(originalFailures)38 val resultAssertions = assertionCounter.getAndReset()39 repeat(originalAssertions) { assertionCounter.inc() }40 return Triple(result, resultFailures, resultAssertions)41}42/​**43 * Pushes the provided [error] onto the [errorCollector] and throws if the configured collection mode is [ErrorCollectionMode.Hard]44 */​45@ExperimentalKotest46internal fun ErrorCollector.pushErrorAndMaybeThrow(error: Throwable) {47 pushError(error)48 if (getCollectionMode() == ErrorCollectionMode.Hard) {49 throwCollectedErrors()50 }51}...

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one.kt

Source: one.kt Github

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1package io.kotest.assertions2import io.kotest.common.ExperimentalKotest3/​**4 * Executes the given lambda and expects exactly one assertion to succeed.5 * If zero, two or more assertions succeed then this will cause this block to fail.6 *7 * ```8 * one {9 * "foo" shouldBe "bar"10 * "foo" shouldBe "foo11 * "foo" shouldBe "baz"12 * }13 * ```14 */​15@ExperimentalKotest16suspend fun <T> one(assertions: suspend () -> T): T {17 val (result, failures, assertionsCount) = errorAndAssertionsScope { assertions() }18 assertionCounter.inc(assertionsCount)19 if (assertionsCount < 2) {20 errorCollector.collectOrThrow(failures + failure("One cannot ensure a mutual exclusion with less than two assertions"))21 }22 if (assertionsCount == failures.size + 1) {23 return result.getOrThrow()24 }25 errorCollector.pushErrors(failures)26 val f = when {27 assertionsCount == failures.size -> failure("One expected a single assertion to succeed, but none succeeded.")28 assertionsCount > failures.size + 1 -> failure("One expected a single assertion to succeed, but more than one succeeded.")29 else -> failure("One expected a single assertion to succeed, but there were more failures than assertions.")30 }31 errorCollector.pushErrorAndMaybeThrow(f)32 throw f /​/​ one/​all/​any won't respect softly for now33}34/​**35 * Executes the given lambda and expects exactly one assertion to succeed.36 * If zero, two or more assertions suceed then this will cause an exception.37 *38 * Returns the original value [t] on success for use in subsequent assertions.39 */​40@ExperimentalKotest41suspend fun <T> one(t: T, assertions: suspend T.(T) -> Unit) = one {42 t.assertions(t)43 t44}...

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any.kt

Source: any.kt Github

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1package io.kotest.assertions2import io.kotest.common.ExperimentalKotest3/​**4 * Runs multiple assertions and expects at least one to succeed, will suppress all exceptions otherwise.5 *6 * ```7 * any {8 * "foo" shouldBe "bar"9 * "foo" shouldBe "foo10 * "foo" shouldBe "baz"11 * }12 * ```13 */​14@ExperimentalKotest15suspend fun <T> any(assertions: suspend () -> T): T {16 val (result, failures, assertionCount) = errorAndAssertionsScope { assertions() }17 assertionCounter.inc(assertionCount)18 if (assertionCount > failures.size || failures.isEmpty() && assertionCount == 0) {19 return result.getOrThrow()20 }21 val f = failure("Any expected at least one assertion to succeed but they all failed")22 errorCollector.pushErrors(failures)23 errorCollector.pushErrorAndMaybeThrow(f)24 throw f25}26@ExperimentalKotest27suspend fun <T> any(t: T, assertions: suspend T.(T) -> Unit) = any {28 t.assertions(t)29 t30}...

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