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How to use afterScan method of io.kotest.core.extensions.DiscoveryExtension class

Best Kotest code snippet using io.kotest.core.extensions.DiscoveryExtension.afterScan

Discovery.kt

Source:Discovery.kt

...28}29/**30 * Scans for tests as specified by a [DiscoveryRequest].31 *32 * [DiscoveryExtension] `afterScan` functions are applied after the scan is complete to33 * optionally filter the returned classes.34 */35class Discovery(private val discoveryExtensions: List<DiscoveryExtension> = emptyList()) {36   private val requests = ConcurrentHashMap<DiscoveryRequest, DiscoveryResult>()37   // the results of a classpath scan, lazily executed and memoized.38   private val scanResult = lazy { classgraph().scan() }39   // filter functions40   //private val isScript: (KClass<*>) -> Boolean = { ScriptTemplateWithArgs::class.java.isAssignableFrom(it.java) }41   private val isSpecSubclassKt: (KClass<*>) -> Boolean = { Spec::class.java.isAssignableFrom(it.java) }42   private val isSpecSubclass: (Class<*>) -> Boolean = { Spec::class.java.isAssignableFrom(it) }43   private val isAbstract: (KClass<*>) -> Boolean = { it.isAbstract }44   private val fromClassPaths: List<KClass<out Spec>> by lazy { scanUris() }45   /**46    * Returns a function that applies all the [DiscoveryFilter]s to a given class.47    * The class must pass all the filters to be included.48    */49   private fun filterFn(filters: List<DiscoveryFilter>): (KClass<out Spec>) -> Boolean = { kclass ->50      filters.isEmpty() || filters.all { it.test(kclass) }51   }52   /**53    * Returns a function that applies all the [DiscoverySelector]s to a given class.54    * The class must pass any one selector to be included.55    */56   private fun selectorFn(selectors: List<DiscoverySelector>): (KClass<out Spec>) -> Boolean = { kclass ->57      selectors.isEmpty() || selectors.any { it.test(kclass) }58   }59   fun discover(request: DiscoveryRequest): DiscoveryResult =60      requests.getOrPut(request) { doDiscovery(request).getOrElse { DiscoveryResult.error(it) } }61//   /**62//    * Scans the classpaths for kotlin script files.63//    */64//   private fun discoverScripts(): List<KClass<out ScriptTemplateWithArgs>> {65//      log { "Discovery: Running script scan" }66//      return scanResult.value67//         .allClasses68//         .filter { it.extendsSuperclass(ScriptTemplateWithArgs::class.java.name) }69//         .map { it.load(false) }70//         .filter(isScript)71//         .filterIsInstance<KClass<out ScriptTemplateWithArgs>>()72//   }73   /**74    * Loads a class reference from a [ClassInfo].75    *76    * @param init false to avoid initializing the class77    */78   private fun ClassInfo.load(init: Boolean): KClass<out Any> =79      Class.forName(name, init, this::class.java.classLoader).kotlin80   private fun doDiscovery(request: DiscoveryRequest): Result<DiscoveryResult> = runCatching {81      val specClasses =82         if (request.onlySelectsSingleClasses()) loadSelectedSpecs(request) else fromClassPaths83      val filtered = specClasses84         .asSequence()85         .filter(selectorFn(request.selectors))86         .filter(filterFn(request.filters))87         // all classes must subclass one of the spec parents88         .filter(isSpecSubclassKt)89         // we don't want abstract classes90         .filterNot(isAbstract)91         .toList()92      log { "After filters there are ${filtered.size} spec classes" }93      log { "[Discovery] Further filtering classes via discovery extensions [$discoveryExtensions]" }94      val afterExtensions = discoveryExtensions95         .fold(filtered) { cl, ext -> ext.afterScan(cl) }96         .sortedBy { it.simpleName }97      log { "After discovery extensions there are ${afterExtensions.size} spec classes" }98      val scriptsEnabled = System.getProperty(KotestEngineProperties.scriptsEnabled) == "true" ||99         System.getenv(KotestEngineProperties.scriptsEnabled) == "true"100//      val scripts = when {101//         scriptsEnabled -> discoverScripts()102//         else -> emptyList()103//      }104      if (scanResult.isInitialized()) runCatching { scanResult.value.close() }105      log { "Discovery result [${afterExtensions.size} specs; scripts]" }106      DiscoveryResult(afterExtensions, emptyList(), null)107   }108   /**109    * Returns whether this is a request that selects single classes...

DiscoveryExtension.kt

Source:DiscoveryExtension.kt

...30    * @param classes the [KClass] for each discovered [Spec]31    *32    * @return  the list of filtered classes to use.33    */34   fun afterScan(classes: List<KClass<out Spec>>): List<KClass<out Spec>>35}...

DiscoveryExtensionExceptionTest.kt

Source:DiscoveryExtensionExceptionTest.kt

...19   }20}21private class EmptySpec : FunSpec()22private val ext = object : DiscoveryExtension {23   override fun afterScan(classes: List<KClass<out Spec>>): List<KClass<out Spec>> {24      error("discovery goes boom")25   }26}27private object Dummy : FunSpec() {28   init {29      test("a") {}30   }31}

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