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How to use DiscoveryExtension class of io.kotest.core.extensions package

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

Discovery.kt

Source:Discovery.kt

1@file:Suppress("unused")2package io.kotest.framework.discovery3import io.github.classgraph.ClassGraph4import io.github.classgraph.ClassInfo5import io.kotest.core.extensions.DiscoveryExtension6import io.kotest.core.internal.KotestEngineProperties7import io.kotest.core.spec.Spec8import io.kotest.mpp.log9import io.kotest.mpp.syspropOrEnv10import java.lang.management.ManagementFactory11import java.util.concurrent.ConcurrentHashMap12import kotlin.reflect.KClass13//import kotlin.script.templates.standard.ScriptTemplateWithArgs14/**15 * Contains the results of a discovery request scan.16 *17 * @specs these are classes which extend one of the spec types18 * @scripts these are kotlin scripts which may or may not contain tests19 */20data class DiscoveryResult(21   val specs: List<KClass<out Spec>>,22   val scripts: List<KClass<*>>,23   val error: Throwable?, // this error is set if there was an exception during discovery24) {25   companion object {26      fun error(t: Throwable): DiscoveryResult = DiscoveryResult(emptyList(), emptyList(), t)27   }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 ->...

DiscoveryExtension.kt

Source:DiscoveryExtension.kt

...9 *10 * This extension is only usable on the JVM target and will have no effect11 * if gradle or another build tool performs the discovery action.12 *13 * Note: If multiple [DiscoveryExtension]s are registered, the order14 * in which they execute is not specified.15 */16@Deprecated("Discovery extensions cannot be injected into some platforms. Use TestFilter or SpecFilter extensions and integrate via project config. Deprecated since 5.0")17interface DiscoveryExtension : Extension {18   /**19    * Invoked as soon as the scan phase has completed. At this point,20    * the [Spec] classes have been detected, but not yet21    * instantiated or executed.22    *23    * Overriding this function gives implementations the possibility24    * of filtering the specs seen by the test engine.25    *26    * For instance, a possible extension may filter tests by package27    * name, class name, classes that only implement a certain28    * interface, etc.29    *30    * @param classes the [KClass] for each discovered [Spec]31    *...

DiscoveryExtensionExceptionTest.kt

Source:DiscoveryExtensionExceptionTest.kt

1package com.sksamuel.kotest.engine.exts2import io.kotest.core.extensions.DiscoveryExtension3import io.kotest.core.spec.Spec4import io.kotest.core.spec.style.FunSpec5import io.kotest.engine.TestEngineLauncher6import io.kotest.engine.listener.CollectingTestEngineListener7import io.kotest.matchers.booleans.shouldBeTrue8import kotlin.reflect.KClass9/**10 * Asserts that an exception through in a [DiscoveryExtension] is correctly handled.11 */12class DiscoveryExtensionExceptionTest : FunSpec() {13   init {14      test("an exception in a discovery extension should be handled") {15         val collector = CollectingTestEngineListener()16         TestEngineLauncher(collector).withClasses(Dummy::class).launch()17         collector.errors.shouldBeTrue()18      }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}...

DiscoveryExtension

Using AI Code Generation

1class MyDiscoveryExtension : DiscoveryExtension {2override fun afterScan(classes: List<KClass<*>>): List<KClass<*>> {3return classes.filterNot { it.simpleName?.endsWith("Test") ?: false }4}5}6registerExtension(MyDiscoveryExtension())7runBlocking {8val result = EngineLauncher()9.withSpec(MySpec::class)10.run()11println(result)12}13TestSuiteResult(14TestCaseResult(15TestSuiteResult(16TestCaseResult(17TestSuiteResult(18TestCaseResult(19TestSuiteResult(20TestCaseResult(21TestSuiteResult(22TestCaseResult(

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