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How to use pattern method of io.kotest.runner.junit.platform.gradle.GradlePostDiscoveryFilterExtractor class

Best Kotest code snippet using io.kotest.runner.junit.platform.gradle.GradlePostDiscoveryFilterExtractor.pattern

KotestJunitPlatformTestEngine.kt

Source:KotestJunitPlatformTestEngine.kt

...74    * Classname.method: adds classname selector and ClassMethodNameFilter post discovery filter75    * org.Classname: doesn't seem to invoke the discover or execute methods.76    *77    * filter in gradle test block:78    * includeTestsMatching("*Test") - class selectors and ClassMethodNameFilter with pattern79    * includeTestsMatching("*Test") AND includeTestsMatching("org.gradle.internal.*") - class selectors and ClassMethodNameFilter with two patterns80    */81   override fun discover(82      request: EngineDiscoveryRequest,83      uniqueId: UniqueId,84   ): KotestEngineDescriptor {85      logger.log { Pair(null, "JUnit discovery request [uniqueId=$uniqueId]") }86      logger.log { Pair(null, request.string()) }87      // if we are excluded from the engines then we say goodnight according to junit rules88      val isKotest = request.engineFilters().all { it.toPredicate().test(this) }89      if (!isKotest)90         return KotestEngineDescriptor(uniqueId, emptyList(), emptyList(), emptyList(), null)91      val classMethodFilterRegexes = GradlePostDiscoveryFilterExtractor.extract(request.postFilters())92      val gradleClassMethodTestFilter = GradleClassMethodRegexTestFilter(classMethodFilterRegexes)93      // a method selector is passed by intellij to run just a single method inside a test file...

GradlePostDiscoveryFilterExtractor.kt

Source:GradlePostDiscoveryFilterExtractor.kt

...10 * But ClassMethodNameFilter, as the name implies, only handles clases and methods.11 * Kotest is more advanced, and JUnit5 Platform allows for hierarchical tests, so this is a limitation12 * of Gradle not implementing the spec fully.13 *14 * Since ClassMethodNameFilter is private, we can't get access to the underlying patterns, so we resort15 * to this reflection bullshit to get the raw strings out, so we can parse and apply the patterns ourselves,16 * thus allowing kotest to properly support the --tests options.17 *18 */19object GradlePostDiscoveryFilterExtractor {20   private val logger = Logger(GradlePostDiscoveryFilterExtractor::class)21   fun extract(filters: List<PostDiscoveryFilter>): List<String> {22      val classMethodFilters = filters.filter { it.javaClass.simpleName == "ClassMethodNameFilter" }23      return classMethodFilters.flatMap { extract(it) }24   }25   private fun extract(filter: Any): List<String> = runCatching {26      val matcher = testMatcher(filter)27      logger.log { Pair(null, "TestMatcher [$matcher]") }28      val commandLineIncludePatterns = commandLineIncludePatterns(matcher)29      logger.log { Pair(null, "commandLineIncludePatterns [$commandLineIncludePatterns]") }30      val regexes = commandLineIncludePatterns.map { pattern(it) }31      logger.log { Pair(null, "ClassMethodNameFilter regexes [$regexes]") }32      regexes33   }.getOrElse { emptyList() }34   private fun testMatcher(obj: Any): Any {35      val field = obj::class.java.getDeclaredField("matcher")36      field.isAccessible = true37      return field.get(obj)38   }39   private fun commandLineIncludePatterns(obj: Any): List<Any> {40      val field = obj::class.java.getDeclaredField("commandLineIncludePatterns")41      field.isAccessible = true42      return field.get(obj) as List<Any>43   }44   private fun pattern(obj: Any): String {45      val field = obj::class.java.getDeclaredField("pattern")46      field.isAccessible = true47      val pattern: Pattern = field.get(obj) as Pattern48      return pattern.pattern()49   }50}...

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