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How to use matchEach method of io.kotest.matchers.collections.MatchInOrderSubsetProblem class

Best Kotest code snippet using io.kotest.matchers.collections.MatchInOrderSubsetProblem.matchEach

CollectionMatchers.kt

Source:CollectionMatchers.kt

...58         { "List ${value.print().value} should not be sorted" }59      )60   }61}62fun <T> matchEach(vararg fns: (T) -> Unit): Matcher<Collection<T>?> = matchEach(fns.asList())63fun <T> matchInOrder(vararg fns: (T) -> Unit): Matcher<Collection<T>?> = matchInOrder(fns.asList(), allowGaps = false)64fun <T> matchInOrderSubset(vararg fns: (T) -> Unit): Matcher<Collection<T>?> = matchInOrder(fns.asList(), allowGaps = true)65/**66 * Assert that a [Collection] contains a subsequence that matches the given assertions. Failing elements may occur67 * between passing ones, if [allowGaps] is set to true68 */69fun <T> matchInOrder(assertions: List<(T) -> Unit>, allowGaps: Boolean): Matcher<Collection<T>?> = neverNullMatcher { actual ->70   val originalMode = errorCollector.getCollectionMode()71   try {72      data class MatchInOrderSubsetProblem(73         val atIndex: Int,74         val problem: String,75      )76      data class MatchInOrderSubsetResult(77         val startIndex: Int,78         val elementsPassed: Int,79         val problems: List<MatchInOrderSubsetProblem>80      )81      val actualAsList = actual.toList()82      var allPassed = false83      var bestResult: MatchInOrderSubsetResult? = null84      for (startIndex in 0..(actual.size - assertions.size)) {85         var elementsPassed = 086         var elementsTested = 087         val currentProblems = ArrayList<MatchInOrderSubsetProblem>()88         while (startIndex + elementsTested < actual.size) {89            if (bestResult == null || elementsPassed > bestResult.elementsPassed) {90               bestResult = MatchInOrderSubsetResult(startIndex, elementsPassed, currentProblems)91            }92            if (!allowGaps && elementsTested > elementsPassed) break93            val elementResult = runCatching {94               assertions[elementsPassed](actualAsList[startIndex + elementsTested])95            }96            if (elementResult.isSuccess) {97               elementsPassed++98               currentProblems.clear()99               if (elementsPassed == assertions.size) {100                  allPassed = true101                  break102               }103            } else {104               currentProblems.add(105                  MatchInOrderSubsetProblem(106                     startIndex + elementsTested,107                     elementResult.exceptionOrNull()!!.message!!108                  )109               )110            }111            elementsTested++112         }113         if (allPassed) break114      }115      MatcherResult(116         allPassed,117         {118            """119            |Expected a sequence of elements to pass the assertions, ${if (allowGaps) "possibly with gaps between " else ""}but failed to match all assertions120            |121            |Best result when comparing from index [${bestResult?.startIndex}], where ${bestResult?.elementsPassed} elements passed, but the following elements failed:122            |123            ${124               bestResult?.problems?.joinToString("\n") { problem ->125                  "|${problem.atIndex} => ${problem.problem}"126               }127            }128            """.trimMargin()129         },130         { "Expected some assertion to fail but all passed" }131      )132   } finally {133      errorCollector.setCollectionMode(originalMode)134   }135}136/**137 * Asserts that each element in the collection matches its corresponding matcher in [assertions].138 * Elements will be compared sequentially in the order given by the iterators of the collections.139 */140fun <T> matchEach(assertions: List<(T) -> Unit>): Matcher<Collection<T>?> = neverNullMatcher { actual ->141   data class ElementPass(val atIndex: Int)142   data class MatchEachProblem(val atIndex: Int, val problem: String?)143   val problems = errorCollector.runWithMode(ErrorCollectionMode.Hard) {144      actual.mapIndexedNotNull { index, element ->145         if (index !in assertions.indices) {146            MatchEachProblem(index, "Element has no corresponding assertion. Only ${assertions.size} assertions provided")147         } else {148            runCatching {149               assertions[index](element)150            }.exceptionOrNull()?.let { exception ->151               MatchEachProblem(index, exception.message)152            }153         }154      }...

matchEach

Using AI Code Generation

1    fun test() {2        val expected = listOf(1, 2, 3)3        val actual = listOf(1, 2, 3)4        actual should matchEach(expected)5    }6}7    fun test() {8        val expected = listOf(1, 2, 3)9        val actual = listOf(1, 2, 3)10        actual should matchEach(expected)11    }12}

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