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How to use seal method of io.kotest.core.spec.DslDrivenSpec class

Best Kotest code snippet using io.kotest.core.spec.DslDrivenSpec.seal

SpecExecutor.kt

Source:SpecExecutor.kt

...106   /**107    * Creates an instance of the given [SpecRef], notifies users of the instantiation event108    * or instantiation failure, and returns a Result with the error or spec.109    *110    * After this method is called the spec is sealed.111    */112   private suspend fun createInstance(ref: SpecRef): Result<Spec> =113      ref.instance(context.configuration.registry)114         .onFailure { extensions.specInstantiationError(ref.kclass, it) }115         .flatMap { spec -> extensions.specInstantiated(spec).map { spec } }116         .onSuccess { if (it is DslDrivenSpec) it.seal() }117}118interface SpecExecutorDelegate {119   suspend fun execute(spec: Spec): Map<TestCase, TestResult>120}121@ExperimentalKotest122internal expect fun createSpecExecutorDelegate(123   listener: TestEngineListener,124   defaultCoroutineDispatcherFactory: CoroutineDispatcherFactory,125   configuration: ProjectConfiguration,126): SpecExecutorDelegate...

DslDrivenSpec.kt

Source:DslDrivenSpec.kt

...16   /**17    * Contains the [RootTest]s that have been registered on this spec.18    */19   private var rootTests = emptyList<RootTest>()20   private var sealed = false21   private val globalExtensions = mutableListOf<Extension>()22   /**23    * Marks that this spec has been instantiated and all root tests have been registered.24    * After this point, no further root tests are allowed to be defined.25    */26   fun seal() {27      sealed = true28   }29   override fun rootTests(): List<RootTest> {30      return rootTests31   }32   override fun globalExtensions(): List<Extension> {33      return globalExtensions.toList()34   }35   override fun add(test: RootTest) {36      if (sealed) throw InvalidDslException("Cannot add a root test after the spec has been instantiated: ${test.name.testName}")37      rootTests = rootTests + test38   }39   /**40    * Include the tests and extensions from the given [TestFactory] in this spec.41    * Tests are added in order from where this include was invoked using configuration and42    * settings at the time the method was invoked.43    */44   fun include(factory: TestFactory) {45      factory.tests.forEach { add(it.copy(factoryId = factory.factoryId)) }46      register(factory.extensions)47   }48   /**49    * Includes the tests from the given [TestFactory] in this spec or factory, with the given50    * prefixed added to each of the test's name....

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