How to use failureMessage method of io.kotest.matchers.internal class

Best Kotest code snippet using io.kotest.matchers.internal.failureMessage

Matcher.kt

Source:Matcher.kt

...16   fun test(value: T): MatcherResult17   infix fun <U> contramap(f: (U) -> T): Matcher<U> = Matcher { this@Matcher.test(f(it)) }18   fun invert(): Matcher<T> = Matcher {19      with(test(it)) {20         MatcherResult(!passed(), { negatedFailureMessage() }, { failureMessage() })21      }22   }23   fun <T> Matcher<T>.invertIf(invert: Boolean): Matcher<T> = if (invert) invert() else this24   @Deprecated("Use contramap. Deprecated in 5.3", ReplaceWith("contramap(fn)"))25   infix fun <U> compose(fn: (U) -> T): Matcher<U> = Matcher { this@Matcher.test(fn(it)) }26   companion object {27      /**28       * Returns a [Matcher] for type T that will always fail with the given [error] message.29       */30      fun <T> failure(error: String) = Matcher<T> { invoke(false, { error }, { "" }) }31      /**32       * Create matcher with the given function to evaluate the value and return a MatcherResult33       *34       * @param tester The function that evaluates a value and returns a MatcherResult35       */36      inline operator fun <T> invoke(crossinline tester: (T) -> MatcherResult) = object : Matcher<T> {37         override fun test(value: T) = tester(value)38      }39   }40}41infix fun <T> Matcher<T>.and(other: Matcher<T>): Matcher<T> = Matcher {42   test(it)43      .takeUnless(MatcherResult::passed)44      ?: other.test(it)45}46infix fun <T> Matcher<T>.or(other: Matcher<T>): Matcher<T> = Matcher {47   test(it)48      .takeIf(MatcherResult::passed)49      ?: other.test(it)50}51/**52 * A [Matcher] that asserts that the value is not `null` before performing the test.53 *54 * The matcher returned by [invert] will _also_ assert that the value is not `null`. Use this for matchers that55 * should fail on `null` values, whether called with `should` or `shouldNot`.56 */57internal abstract class NeverNullMatcher<T : Any?> : Matcher<T?> {58   final override fun test(value: T?): MatcherResult {59      return if (value == null) invoke(false, { "Expecting actual not to be null" }, { "" })60      else testNotNull(value)61   }62   override fun invert(): Matcher<T?> = object : NeverNullMatcher<T?>() {63      override fun testNotNull(value: T?): MatcherResult {64         if (value == null) return invoke(false, { "Expecting actual not to be null" }, { "" })65         val result = this@NeverNullMatcher.testNotNull(value)66         return invoke(!result.passed(), { result.negatedFailureMessage() }, { result.failureMessage() })67      }68   }69   abstract fun testNotNull(value: T): MatcherResult70   companion object {71      /**72       * Create matcher with the given function to evaluate the value and return a MatcherResult73       *74       * @param tester The function that evaluates a value and returns a MatcherResult75       */76      inline operator fun <T : Any> invoke(crossinline tester: (T) -> MatcherResult) = object : NeverNullMatcher<T>() {77         override fun testNotNull(value: T) = tester(value)78      }79   }80}81fun <T : Any> neverNullMatcher(t: (T) -> MatcherResult): Matcher<T?> {82   return object : NeverNullMatcher<T>() {83      override fun testNotNull(value: T): MatcherResult {84         return t(value)85      }86   }87}88/**89 * An instance of [MatcherResult] contains the result of an evaluation of a [Matcher].90 */91interface MatcherResult {92   /**93    * Returns true if the matcher indicated this was a valid94    * value and false if the matcher indicated an invalid value.95    */96   fun passed(): Boolean97   /**98    * Returns a message indicating why the matcher failed for when this matcher99    * is used in the positive sense. For example, if a size matcher was used100    * like `mylist should haveSize(5)` then an appropriate error message would101    * be "list should be size 5".102    */103   fun failureMessage(): String104   /**105    * Returns a message indicating why the matcher failed for when this matcher106    * is used in the negative sense. For example, if a size matcher was used107    * like `mylist shouldNot haveSize(5)` then an appropriate negated failure108    * would be "List should not have size 5".109    */110   fun negatedFailureMessage(): String111   companion object {112      @Deprecated(113         "Prefer the version that accepts functions - this avoids eager creation of messages. This was deprecated in 5.0.",114         ReplaceWith(115            "MatcherResult(\npassed,\n{ failureMessage },\n{ negatedFailureMessage }\n)"116         )117      )118      operator fun invoke(119         passed: Boolean,120         failureMessage: String,121         negatedFailureMessage: String122      ) = invoke(passed, { failureMessage }, { negatedFailureMessage })123      operator fun invoke(124         passed: Boolean,125         failureMessageFn: () -> String,126         negatedFailureMessageFn: () -> String127      ) = object : MatcherResult {128         override fun passed(): Boolean = passed129         override fun failureMessage(): String = failureMessageFn()130         override fun negatedFailureMessage(): String = negatedFailureMessageFn()131      }132   }133}134interface ComparableMatcherResult : MatcherResult {135   fun actual(): String136   fun expected(): String137   companion object {138      operator fun invoke(139         passed: Boolean,140         failureMessageFn: () -> String,141         negatedFailureMessageFn: () -> String,142         actual: String,143         expected: String,144      ) = object : ComparableMatcherResult {145         override fun passed(): Boolean = passed146         override fun failureMessage(): String = failureMessageFn()147         override fun negatedFailureMessage(): String = negatedFailureMessageFn()148         override fun actual(): String = actual149         override fun expected(): String = expected150      }151   }152}...

matchers.kt

Source:matchers.kt

...71internal fun test(inverse: Boolean = false, block: () -> MatcherResult) {72  val result = block()73  if ((inverse && result.passed()) || (!inverse && !result.passed())) {74     errorCollector.collectOrThrow(75      failure(if (inverse) result.negatedFailureMessage() else result.failureMessage())76    )77  }78}...

uri.kt

Source:uri.kt

...11    override fun test(value: Uri): MatcherResult {12        val testResult = match.test(extractValue(value))13        return MatcherResult(14            testResult.passed(),15            { "Invalid Uri $name: ${testResult.failureMessage()}" },16            { "Invalid Uri $name: ${testResult.negatedFailureMessage()}" }17        )18    }19}20infix fun Uri.shouldHavePath(match: Matcher<String?>) = this should havePath(match)21infix fun Uri.shouldNotHavePath(match: Matcher<String?>) = this shouldNot havePath(match)22fun havePath(matcher: Matcher<String?>): Matcher<Uri> = uriHas("path", Uri::path, matcher)23infix fun Uri.shouldHavePath(expected: String?) = this should havePath(expected)24infix fun Uri.shouldNotHavePath(expected: String?) = this shouldNot havePath(expected)25fun havePath(expected: String?): Matcher<Uri> = havePath(be(expected))26infix fun Uri.shouldHavePath(expected: Regex) = this should havePath(expected)27infix fun Uri.shouldNotHavePath(expected: Regex) = this shouldNot havePath(expected)28fun havePath(expected: Regex): Matcher<Uri> = havePath(contain(expected))29infix fun Uri.shouldHaveQuery(expected: String) = this should haveQuery(expected)...

failureMessage

Using AI Code Generation

1fun <T> Matcher<T>.failureMessage(actual: T): String {2    return when (matcher) {3        is EqualsMatcher -> matcher.failureMessage(actual)4        is BeMatcher -> matcher.failureMessage(actual)5        is InMatcher -> matcher.failureMessage(actual)6        is NotMatcher -> matcher.failureMessage(actual)7        is AndMatcher -> matcher.failureMessage(actual)8        is OrMatcher -> matcher.failureMessage(actual)9        is ContainsMatcher -> matcher.failureMessage(actual)10        is StartWithMatcher -> matcher.failureMessage(actual)11        is EndWithMatcher -> matcher.failureMessage(actual)12        is MatchMatcher -> matcher.failureMessage(actual)13        is ShouldBeMatcher -> matcher.failureMessage(actual)14        is ShouldNotBeMatcher -> matcher.failureMessage(actual)15        is ShouldBeInstanceOfMatcher -> matcher.failureMessage(actual)16        is ShouldBeTypeOfMatcher -> matcher.failureMessage(actual)17        is ShouldNotBeInstanceOfMatcher -> matcher.failureMessage(actual)18        is ShouldNotBeTypeOfMatcher -> matcher.failureMessage(actual)19        is ShouldBeNullMatcher -> matcher.failureMessage(actual)20        is ShouldNotBeNullMatcher -> matcher.failureMessage(actual)21        is ShouldBeSameInstanceAsMatcher -> matcher.failureMessage(actual)22        is ShouldNotBeSameInstanceAsMatcher -> matcher.failureMessage(actual)23        is ShouldBeEqualComparingFieldsMatcher -> matcher.failureMessage(actual)24        is ShouldBeEqualComparingToMatcher -> matcher.failureMessage(actual)25        is ShouldBeEqualNormalizingWhitespaceMatcher -> matcher.failureMessage(actual)26        is ShouldBeEqualUsingComparatorMatcher -> matcher.failureMessage(actual)27        is ShouldBeEqualUsingFieldByFieldComparatorMatcher -> matcher.failureMessage(actual)28        is ShouldBeEqualUsingFieldByFieldElementComparatorMatcher -> matcher.failureMessage(actual)29        is ShouldBeGreaterThanMatcher -> matcher.failureMessage(actual)30        is ShouldBeGreaterThanOrEqualMatcher -> matcher.failureMessage(actual)31        is ShouldBeLessThanMatcher -> matcher.failureMessage(actual)32        is ShouldBeLessThanOrEqualMatcher -> matcher.failureMessage(actual)33        is ShouldBeBetweenMatcher -> matcher.failureMessage(actual)34        is ShouldBeBetweenInclusiveMatcher -> matcher.failureMessage(actual)35        is ShouldBeBetweenExclusiveMatcher -> matcher.failureMessage(actual)36        is ShouldBeBetweenInclusiveInclusiveMatcher -> matcher.failureMessage(actual)37        is ShouldBeBetweenExclusiveInclusiveMatcher -> matcher.failureMessage(actual)38        is ShouldBeBetweenInclusiveExclusiveMatcher -> matcher.failureMessage(actual)

failureMessage

Using AI Code Generation

1fun failureMessage(actual: Any?, matcher: () -> Matcher<*>) = matcher().failureMessage(actual)2fun main() {3    val softAssertions = SoftAssertions()4    softAssertions.assertThat(1).isEqualTo(2)5    softAssertions.assertThat(3).isEqualTo(4)6    softAssertions.assertAll()7}8fun <T> T?.should(matcher: () -> Matcher<T>) {9    contract {10        returns() implies (this@should != null)11    }12    if (!matcher().test(actual)) {13        throw AssertionError(failureMessage(actual, matcher))14    }15}16fun <T> T?.shouldBe(matcher: () -> Matcher<T>) {17    this.should(matcher)18}19fun <T> T?.shouldNot(matcher: () -> Matcher<T>) {20    if (matcher().test(actual)) {21        throw AssertionError(failureMessage(actual, matcher))22    }23}24fun <T> T?.shouldNotBe(matcher: () -> Matcher<T>) {25    this.shouldNot(matcher)26}27fun <T> T?.should(matcher: Matcher<T>) {28    if (!matcher.test(actual)) {29        throw AssertionError(failureMessage(actual, { matcher }))30    }31}32fun <T> T?.shouldBe(matcher: Matcher<T>) {33    this.should(matcher)34}35fun <T> T?.shouldNot(matcher: Matcher<T>) {36    if (matcher.test(actual)) {37        throw AssertionError(failureMessage(actual, { matcher }))38    }39}40fun <T> T?.shouldNotBe(matcher: Matcher<T>) {41    this.shouldNot(matcher)42}43fun <T> T?.should(block: Matcher<T>.() -> Unit) {44    val matcher = object : Matcher<T> {45        override fun test(value: T) = value == actual46    }47    matcher.block()48    if (!matcher.test(actual)) {49        throw AssertionError(failureMessage(actual, { matcher }))50    }51}52fun <T> T?.shouldBe(block: Matcher<T>.() -> Unit) {53    this.should(block)54}55fun <T> T?.shouldNot(block: Matcher<T>.() -> Unit) {

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