How to use SpecDescriptor.append method of io.kotest.core.descriptors.SpecDescriptor class

Best Kotest code snippet using io.kotest.core.descriptors.SpecDescriptor.SpecDescriptor.append

JUnitTestEngineListener.kt

Source:JUnitTestEngineListener.kt

1package io.kotest.runner.junit.platform2import io.kotest.core.config.ProjectConfiguration3import io.kotest.core.descriptors.Descriptor4import io.kotest.core.descriptors.DescriptorId5import io.kotest.core.descriptors.toDescriptor6import io.kotest.core.names.DisplayNameFormatter7import io.kotest.core.names.UniqueNames8import io.kotest.core.test.TestCase9import io.kotest.core.test.TestResult10import io.kotest.core.test.TestType11import io.kotest.engine.errors.ExtensionExceptionExtractor12import io.kotest.engine.interceptors.EngineContext13import io.kotest.engine.listener.AbstractTestEngineListener14import io.kotest.engine.test.names.DefaultDisplayNameFormatter15import io.kotest.engine.test.names.getDisplayNameFormatter16import io.kotest.mpp.Logger17import io.kotest.mpp.bestName18import org.junit.platform.engine.EngineExecutionListener19import org.junit.platform.engine.TestDescriptor20import org.junit.platform.engine.TestExecutionResult21import org.junit.platform.engine.support.descriptor.ClassSource22import org.junit.platform.engine.support.descriptor.EngineDescriptor23import kotlin.reflect.KClass24import kotlin.time.Duration25/**26 * Notifies JUnit Platform of test statuses via a [EngineExecutionListener].27 *28 * This is not thread safe and should only be invoked by one spec at a time.29 *30 * JUnit platform supports out of order notification of tests, in that sibling31 * tests can be executing in parallel and updating JUnit out of order. However the gradle test32 * task gets confused if we are executing two or more tests directly under the root at once.33 * Therefore we must queue up notifications until each spec is completed.34 *35 * Gradle test run observations:36 *37 * using Platform 1.6.0 --38 * TestDescriptor.Type.CONTAINER seem to be ignored in output.39 * TestDescriptor.Type.CONTAINER_AND_TEST appear as siblings of their nested tests if not added as a child40 * Add child first, then register dynamic test, then start the test41 *42 * Top level descriptors must have a source attached or the execution will fail with a parent attached exception.43 * Type.CONTAINER_TEST doesn't seem to work as a top level descriptor, it will hang44 * leaf tests do not need to be completed but they will be marked as uncomplete in intellij.45 * Dynamic test can be called after or before addChild.46 * A Type.TEST can be a child of a Type.TEST.47 * Intermediate Type.CONTAINER seem to be ignored in output.48 * Intermediate containers can have same class source as parent.49 * Type.TEST as top level seems to hang.50 * A TEST doesn't seem to be able to have the same source as a parent, or hang.51 * A TEST seems to hang if it has a ClassSource.52 * MethodSource seems to be ok with a TEST.53 * Container test names seem to be taken from a Source.54 * Nested tests are outputted as siblings.55 * Can complete executions out of order.56 * Child failures will fail parent CONTAINER.57 * Sibling containers can start and finish in parallel.58 *59 * Intellij runner observations:60 *61 * Intermediate Type.CONTAINERs are shown.62 * Intermediate Type.TESTs are shown.63 * A Type.TEST can be a child of a Type.TEST64 * MethodSource seems to be ok with a TEST.65 * Container test names seem to be taken from the name property.66 * Nested tests are outputted as nested.67 * Child failures will not fail containing TEST.68 * child failures will fail a containing CONTAINER.69 * Call addChild _before_ registering test otherwise will appear in the display out of order.70 * Must start tests after their parent or they can go missing.71 * Sibling containers can start and finish in parallel.72 */73class JUnitTestEngineListener(74   private val listener: EngineExecutionListener,75   val root: EngineDescriptor,76) : AbstractTestEngineListener() {77   private val logger = Logger(JUnitTestEngineListener::class)78   private var formatter: DisplayNameFormatter = DefaultDisplayNameFormatter(ProjectConfiguration())79   // contains a mapping of junit TestDescriptor's, so we can find previously registered tests80   private val descriptors = mutableMapOf<Descriptor, TestDescriptor>()81   private var started = false82   private val startedTests = mutableSetOf<Descriptor.TestDescriptor>()83   // the root tests are our entry point when outputting results84   private val rootTests = mutableListOf<TestCase>()85   private var failOnIgnoredTests = false86   private val children = mutableMapOf<Descriptor, MutableList<TestCase>>()87   private val results = mutableMapOf<Descriptor, TestResult>()88   private val dummies = hashSetOf<String>()89   override suspend fun engineStarted() {90      logger.log { Pair(null, "Engine started") }91      listener.executionStarted(root)92   }93   override suspend fun engineInitialized(context: EngineContext) {94      failOnIgnoredTests = context.configuration.failOnIgnoredTests95      formatter = getDisplayNameFormatter(context.configuration.registry, context.configuration)96   }97   override suspend fun engineFinished(t: List<Throwable>) {98      logger.log { Pair(null, "Engine finished; throwables=[${t}]") }99      registerExceptionPlaceholders(t)100      val result = if (failOnIgnoredTests && results.values.any { it.isIgnored }) {101         TestExecutionResult.failed(RuntimeException("Build contained ignored test"))102      } else {103         TestExecutionResult.successful()104      }105      logger.log { Pair(null, "Notifying junit that engine completed $root") }106      listener.executionFinished(root, result)107   }108   override suspend fun specStarted(kclass: KClass<*>) {109      markSpecStarted(kclass)110   }111   override suspend fun specFinished(kclass: KClass<*>, result: TestResult) {112      val t = result.errorOrNull113      when {114         // if we have a spec error before we even started the spec, we will start the spec, add a placeholder115         // to hold the error, mark that test as failed, and then fail the spec as well116         t != null && !started -> {117            val descriptor = markSpecStarted(kclass)118            addPlaceholderTest(descriptor, t, kclass)119            logger.log { Pair(kclass.bestName(), "execution failed: $descriptor $t") }120            listener.executionFinished(descriptor, TestExecutionResult.failed(t))121         }122         // if we had an error in the spec, and we had no tests, we'll add the dummy and return123         t != null && rootTests.isEmpty() -> {124            val descriptor = getSpecDescriptor(kclass)125            addPlaceholderTest(descriptor, t, kclass)126            logger.log { Pair(kclass.bestName(), "execution failed: $descriptor $t") }127            listener.executionFinished(descriptor, TestExecutionResult.failed(t))128         }129         else -> {130            val descriptor = getSpecDescriptor(kclass)131            val result = when (t) {132               null -> TestExecutionResult.successful()133               else -> {134                  addPlaceholderTest(descriptor, t, kclass)135                  TestExecutionResult.successful()136               }137            }138            logger.log { Pair(kclass.bestName(), "executionFinished: $descriptor") }139            listener.executionFinished(descriptor, result)140         }141      }142      reset()143   }144   override suspend fun specIgnored(kclass: KClass<*>, reason: String?) {145      logger.log { Pair(kclass.bestName(), "Spec is being flagged as ignored") }146      listener.executionSkipped(getSpecDescriptor(kclass), reason)147   }148   private fun markSpecStarted(kclass: KClass<*>): TestDescriptor {149      return try {150         val descriptor = getSpecDescriptor(root, kclass.toDescriptor(), formatter.format(kclass))151         logger.log { Pair(kclass.bestName(), "Registering dynamic spec $descriptor") }152         listener.dynamicTestRegistered(descriptor)153         logger.log { Pair(kclass.bestName(), "Spec executionStarted $descriptor") }154         listener.executionStarted(descriptor)155         started = true156         descriptor157      } catch (t: Throwable) {158         logger.log { Pair(kclass.bestName(), "Error in JUnit Platform listener $t") }159         throw t160      }161   }162   private fun reset() {163      rootTests.clear()164      children.clear()165      results.clear()166      started = false167      descriptors.clear()168      startedTests.clear()169   }170   private fun addPlaceholderTest(parent: TestDescriptor, t: Throwable, kclass: KClass<*>) {171      val (name, cause) = ExtensionExceptionExtractor.resolve(t)172      val descriptor = createTestDescriptor(173         parent.uniqueId.append(Segment.Test.value, name),174         name,175         TestDescriptor.Type.TEST,176         ClassSource.from(kclass.java),177         false178      )179      parent.addChild(descriptor)180      listener.dynamicTestRegistered(descriptor)181      listener.executionStarted(descriptor)182      listener.executionFinished(descriptor, TestResult.Error(Duration.ZERO, cause).toTestExecutionResult())183   }184   override suspend fun testStarted(testCase: TestCase) {185      // depending on the test type, we may want to wait to notify junit, this is because gradle doesn't work186      // properly with the junit test types. Ideally, we'd just set everything to CONTAINER_AND_TEST, which is187      // supposed to mean a test can contain other tests as well as being a test itself, which is exactly how188      // Kotest views tests, but unfortunately it doesn't work properly.189      //190      // Another approach is to wait until the spec finishes to see which tests contain children and which191      // don't and set the test type appropriately, but junit doesn't give us a way to specify test duration192      // (instead it just calculates it itself from the time between marking a test as started and marking193      // it as finished), so this approach works but ends up having all tests as 0ms194      //195      // So the approach we will take is use the TestType from the test definition, unless it is dynamic,196      // then for dynamic we will calculate it later, and accept the 0ms drawback197      logger.log { Pair(testCase.name.testName, "test started") }198      if (testCase.parent != null) rootTests.add(testCase)199      addChild(testCase)200      when (testCase.type) {201         TestType.Container -> startTestIfNotStarted(testCase, TestDescriptor.Type.CONTAINER)202         TestType.Test -> startTestIfNotStarted(testCase, TestDescriptor.Type.TEST)203         TestType.Dynamic -> Unit204      }205   }206   // this test can be output now it has completed as we have all we need to know to complete it207   override suspend fun testFinished(testCase: TestCase, result: TestResult) {208      logger.log { Pair(testCase.name.testName, "test finished $result") }209      results[testCase.descriptor] = result210      val descriptor = getOrCreateTestDescriptor(testCase, null)211      // we need to ensure all parents have been started first212      startParents(testCase)213      startTestIfNotStarted(testCase, null)214      logger.log { Pair(testCase.name.testName, "executionFinished: $descriptor") }215      listener.executionFinished(descriptor, result.toTestExecutionResult())216   }217   override suspend fun testIgnored(testCase: TestCase, reason: String?) {218      logger.log { Pair(testCase.name.testName, "test ignored $reason") }219      if (testCase.parent == null) rootTests.add(testCase)220      addChild(testCase)221      results[testCase.descriptor] = TestResult.Ignored(reason)222      // we need to ensure all parents have been started first223      startParents(testCase)224      val descriptor = getOrCreateTestDescriptor(testCase, TestDescriptor.Type.TEST)225      logger.log { Pair(testCase.name.testName, "Registering dynamic test: $descriptor") }226      listener.dynamicTestRegistered(descriptor)227      logger.log { Pair(testCase.name.testName, "executionSkipped: $descriptor") }228      listener.executionSkipped(descriptor, reason)229   }230   private fun addChild(testCase: TestCase) {231      children.getOrPut(testCase.descriptor.parent) { mutableListOf() }.add(testCase)232   }233   private fun startParents(testCase: TestCase) {234      val parent = testCase.parent235      if (parent != null) {236         startParents(parent)237         startTestIfNotStarted(parent, null)238      }239   }240   private fun startTestIfNotStarted(testCase: TestCase, type: TestDescriptor.Type?) {241      if (!startedTests.contains(testCase.descriptor)) {242         val descriptor = getOrCreateTestDescriptor(testCase, type)243         logger.log { Pair(testCase.name.testName, "Registering dynamic test: $descriptor") }244         listener.dynamicTestRegistered(descriptor)245         logger.log { Pair(testCase.name.testName, "executionStarted: $descriptor") }246         listener.executionStarted(descriptor)247         startedTests.add(testCase.descriptor)248      }249   }250   private fun getOrCreateTestDescriptor(testCase: TestCase, type: TestDescriptor.Type?): TestDescriptor {251      val existing = descriptors[testCase.descriptor]252      if (existing != null) return existing253      val parent = when (val p = testCase.parent) {254         null -> getSpecDescriptor(testCase.spec::class)255         else -> getOrCreateTestDescriptor(p, null)256      }257      val id = parent.uniqueId.append(testCase.descriptor)258      // we dynamically work out the type if null by looking to see if this test had any children259      val c = children[testCase.descriptor]260      val t = when {261         type != null -> type262         c == null || c.isEmpty() -> TestDescriptor.Type.TEST263         else -> TestDescriptor.Type.CONTAINER264      }265      return createTestDescriptor(266         id,267         formatter.format(testCase),268         t,269         ClassSource.from(testCase.spec::class.java, null), // gradle-junit-platform hides tests if we don't send this270         type == TestDescriptor.Type.CONTAINER271      ).apply {272         parent.addChild(this)273         descriptors[testCase.descriptor] = this274      }275   }276   private fun getSpecDescriptor(kclass: KClass<*>): TestDescriptor {277      return getSpecDescriptor(root, kclass.toDescriptor(), formatter.format(kclass))278   }279   private fun createAndRegisterDummySpec(name: String): TestDescriptor {280      val unique = UniqueNames.unique(name, dummies) { s, k -> "${s}_$k" } ?: name281      dummies.add(unique)282      val descriptor = getSpecDescriptor(root, Descriptor.SpecDescriptor(DescriptorId(unique), this::class), unique)283      listener.dynamicTestRegistered(descriptor)284      return descriptor285   }286   private fun registerExceptionPlaceholders(ts: List<Throwable>) {287      ts.forEach {288         val (name, cause) = ExtensionExceptionExtractor.resolve(it)289         val container = createAndRegisterDummySpec(name)290         listener.executionStarted(container)291         listener.executionFinished(container, TestExecutionResult.failed(cause))292      }293   }294}...

descriptor.kt

Source:descriptor.kt

1package io.kotest.core.descriptors2import io.kotest.common.KotestInternal3import io.kotest.core.descriptors.Descriptor.SpecDescriptor4import io.kotest.core.descriptors.Descriptor.TestDescriptor5import io.kotest.core.names.TestName6import kotlin.reflect.KClass7typealias TestPath = io.kotest.common.TestPath8/**9 * A parseable, stable, consistent identifer for a test element.10 *11 * The id should not depend on runtime configuration and should not change between test runs,12 * unless the test, or a parent test, has been modified by the user.13 */14sealed interface Descriptor {15   val id: DescriptorId16   /**17    * A [Descriptor] for a spec class or a script file.18    */19   data class SpecDescriptor(20      override val id: DescriptorId,21      val kclass: KClass<*>,22   ) : Descriptor23   /**24    * A [Descriptor] for a test.25    */26   data class TestDescriptor(27      val parent: Descriptor,28      override val id: DescriptorId,29   ) : Descriptor30   companion object {31      const val SpecDelimiter = "/"32      const val TestDelimiter = " -- "33   }34   fun ids(): List<DescriptorId> = when (this) {35      is SpecDescriptor -> listOf(this.id)36      is TestDescriptor -> this.parent.ids() + this.id37   }38   /**39    * Returns a parseable path to the test.40    *41    * @param includeSpec if true then the spec name is included in the path.42    */43   fun path(includeSpec: Boolean = true): TestPath = when (this) {44      is SpecDescriptor -> if (includeSpec) TestPath(this.id.value) else error("Cannot call path on spec with includeSpec=false")45      is TestDescriptor -> when (this.parent) {46         is SpecDescriptor -> when (includeSpec) {47            true -> TestPath(this.parent.id.value + SpecDelimiter + this.id.value)48            false -> TestPath(this.id.value)49         }50         is TestDescriptor -> TestPath(this.parent.path(includeSpec).value + TestDelimiter + this.id.value)51      }52   }53   @KotestInternal54   fun parts(): List<String> = when (this) {55      is SpecDescriptor -> emptyList()56      is TestDescriptor -> parent.parts() + listOf(this.id.value)57   }58   /**59    * Returns true if this descriptor is for a class based test file.60    */61   fun isSpec() = this is SpecDescriptor62   /**63    * Returns true if this descriptor is for a test case.64    */65   fun isTestCase() = this is TestDescriptor66   /**67    * Returns true if this descriptor represents a root test case.68    */69   fun isRootTest() = this is TestDescriptor && this.parent.isSpec()70   /**71    * Returns the depth of this node, where the [SpecDescriptor] has depth of 0,72    * a root test has depth 1 and so on.73    */74   fun depth() = parents().size - 175   /**76    * Recursively returns any parent descriptors, with the spec being first in the list77    * and this being last.78    */79   fun parents(): List<Descriptor> = when (this) {80      is SpecDescriptor -> emptyList()81      is TestDescriptor -> parent.parents() + parent82   }83   fun chain() = parents() + this84   /**85    * Returns true if this descriptor is the immediate parent of the given [descriptor].86    */87   fun isParentOf(descriptor: Descriptor): Boolean = when (descriptor) {88      is SpecDescriptor -> false // nothing can be the parent of a spec89      is TestDescriptor -> this.id == descriptor.parent.id90   }91   /**92    * Returns true if this descriptor is ancestor (1..nth-parent) of the given [descriptor].93    */94   fun isAncestorOf(descriptor: Descriptor): Boolean = when (descriptor) {95      is SpecDescriptor -> false // nothing can be an ancestor of a spec96      is TestDescriptor -> this.id == descriptor.parent.id || isAncestorOf(descriptor.parent)97   }98   /**99    * Returns true if this descriptor is the immediate child of the given [descriptor].100    */101   fun isChildOf(descriptor: Descriptor): Boolean = descriptor.isParentOf(this)102   /**103    * Returns true if this descriptor is a child, grandchild, etc of the given [descriptor].104    */105   fun isDescendentOf(descriptor: Descriptor): Boolean = descriptor.isAncestorOf(this)106   /**107    * Returns true if this instance is on the path to the given description. That is, if this108    * instance is either an ancestor of, of the same as, the given description.109    */110   fun isOnPath(description: Descriptor): Boolean =111      this.path() == description.path() || this.isAncestorOf(description)112   /**113    * Returns the [SpecDescriptor] parent for this [Descriptor].114    * If this is already a spec descriptor, then returns itself.115    */116   fun spec(): SpecDescriptor = when (this) {117      is SpecDescriptor -> this118      is TestDescriptor -> this.parent.spec()119   }120}121data class DescriptorId(val value: String)122fun SpecDescriptor.append(name: TestName): TestDescriptor =123   TestDescriptor(this, DescriptorId(name.testName))124fun TestDescriptor.append(name: TestName): TestDescriptor =125   this.append(name.testName)126fun Descriptor.append(name: String): TestDescriptor =127   TestDescriptor(this, DescriptorId(name))128/**129 * Returns the [TestDescriptor] that is the root for this [TestDescriptor].130 * This may be the same descriptor that this method is invoked on, if that descriptor131 * is a root test.132 */133fun TestDescriptor.root(): TestDescriptor {134   return when (parent) {135      is SpecDescriptor -> this // if my parent is a spec, then I am a root136      is TestDescriptor -> parent.root()137   }138}...

descriptors.kt

Source:descriptors.kt

1package io.kotest.runner.junit.platform2import io.kotest.core.descriptors.Descriptor3import org.junit.platform.engine.TestDescriptor4import org.junit.platform.engine.TestSource5import org.junit.platform.engine.UniqueId6import org.junit.platform.engine.support.descriptor.AbstractTestDescriptor7import org.junit.platform.engine.support.descriptor.ClassSource8/**9 * Creates a [TestDescriptor] from the given class, and attaches it to the engine,10 * if one does not already exist.11 *12 * The created Test Descriptor will have segment type [Segment.Spec] and will use [displayName].13 */14fun getSpecDescriptor(15   engine: TestDescriptor,16   descriptor: Descriptor.SpecDescriptor,17   displayName: String,18): TestDescriptor {19   val id = engine.uniqueId.append(Segment.Spec.value, descriptor.id.value)20   return engine.findByUniqueId(id).orElseGet { null }21      ?: createAndRegisterSpecDescription(engine, descriptor, displayName)22}23private fun createAndRegisterSpecDescription(24   engine: TestDescriptor,25   descriptor: Descriptor.SpecDescriptor,26   displayName: String,27): TestDescriptor {28   val id = engine.uniqueId.append(Segment.Spec.value, descriptor.id.value)29   val source = ClassSource.from(descriptor.kclass.java)30   val testDescriptor: TestDescriptor = object : AbstractTestDescriptor(id, displayName, source) {31      override fun getType(): TestDescriptor.Type = TestDescriptor.Type.CONTAINER32      override fun mayRegisterTests(): Boolean = true33   }34   engine.addChild(testDescriptor)35   return testDescriptor36}37/**38 * Creates a [TestDescriptor] for the given [testCase] and attaches it to the [parent].39 * The created descriptor will have segment type [Segment.Test] and will use [displayName].40 */41fun createTestDescriptor(42   id: UniqueId,43   displayName: String,44   type: TestDescriptor.Type,45   source: TestSource?,46   mayRegisterTests: Boolean,47): TestDescriptor = object : AbstractTestDescriptor(id, displayName, source) {48   // there is a bug in gradle 4.7+ whereby CONTAINER_AND_TEST breaks test reporting or hangs the build, as it is not handled49   // see https://github.com/gradle/gradle/issues/491250   // so we can't use CONTAINER_AND_TEST for our test scopes, but simply container51   // update jan 2020: Seems we can use CONTAINER_AND_TEST now in gradle 6, and CONTAINER is invisible in output52   // update sep 2021: gradle 7.1 seems we can use TEST for everything but CONTAINER_AND_TEST will not show without a contained test53   // update for 5.0.0.M2 - will just dynamically add tests after they have completed, and we can see the full tree54   // update 5.0.0.M3 - if we add dynamically afterwards then the timings are all messed up, seems gradle keeps the time itself55   override fun getType(): TestDescriptor.Type = type56   override fun mayRegisterTests(): Boolean = mayRegisterTests57}...

PostDiscoveryFilterAdapter.kt

Source:PostDiscoveryFilterAdapter.kt

1package io.kotest.runner.junit.platform.gradle2import io.kotest.core.descriptors.Descriptor3import io.kotest.core.filter.TestFilter4import io.kotest.core.filter.TestFilterResult5import io.kotest.core.filter.toTestFilterResult6import io.kotest.runner.junit.platform.append7import org.junit.platform.engine.TestDescriptor8import org.junit.platform.engine.TestSource9import org.junit.platform.engine.UniqueId10import org.junit.platform.engine.support.descriptor.ClassSource11import org.junit.platform.engine.support.descriptor.MethodSource12import org.junit.platform.launcher.PostDiscoveryFilter13/**14 * Gradles uses a post discovery filter called [ClassMethodNameFilter] when a user runs gradle15 * with either `-- tests someClass` or by adding a test filter section to their gradle build.16 * This filter class makes all kinds of assumptions around what is a test and what isn't,17 * so we must fool it by creating a test description with a dummy TestSource.18 * This is liable to be buggy, and should be stripped out as soon as gradle19 * fix their bugs around junit 5 support, if ever.20 */21class PostDiscoveryFilterAdapter(22   private val filter: PostDiscoveryFilter,23   private val uniqueId: UniqueId24) : TestFilter {25   override fun filter(descriptor: Descriptor): TestFilterResult {26      val testDescriptor = createTestDescriptor(uniqueId, descriptor, descriptor.id.value)27      return filter28         .toPredicate()29         .test(testDescriptor)30         .toTestFilterResult("Excluded by JUnit ClassMethodNameFilter: $filter")31   }32   /**33    * Creates a new [TestDescriptor] from the given Kotest [descriptor], chaining from34    * the [root] uniqueId. The [TestSource] is fudged since JUnit makes assumptions that tests are methods.35    * This descriptor is only used by the filter adapter.36    */37   private fun createTestDescriptor(root: UniqueId, descriptor: Descriptor, displayName: String): TestDescriptor {38      val id: UniqueId = descriptor.chain().fold(root) { acc, desc -> acc.append(desc) }39      val source = when (descriptor) {40         is Descriptor.SpecDescriptor -> ClassSource.from(descriptor.kclass.java)41         // this isn't a method, but we can use MethodSource with the test name, so it's at least42         // somewhat compatible for top level tests.43         is Descriptor.TestDescriptor -> MethodSource.from(descriptor.spec().kclass.java.name, descriptor.path().value)44      }45      return io.kotest.runner.junit.platform.createTestDescriptor(46         id,47         displayName,48         TestDescriptor.Type.CONTAINER,49         source,50         false51      )52   }53}...

uniqueids.kt

Source:uniqueids.kt

1package io.kotest.runner.junit.platform2import io.kotest.core.descriptors.Descriptor3import org.junit.platform.engine.UniqueId4/**5 * Returns a new [UniqueId] by appending this [descriptor] to the receiver.6 */7fun UniqueId.append(descriptor: Descriptor): UniqueId {8   val segment = when (descriptor) {9      is Descriptor.SpecDescriptor -> Segment.Spec10      is Descriptor.TestDescriptor -> Segment.Test11   }12   return this.append(segment.value, descriptor.id.value)13}14sealed class Segment {15   abstract val value: String16   object Spec : Segment() {17      override val value: String = "spec"18   }19   object Script : Segment() {20      override val value: String = "script"21   }22   object Test : Segment() {23      override val value: String = "test"24   }25}...

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