Failed to generate fixtures for Kotlin sealed class containing object declaration due to missing primary constructor

[forgreen0624]

Describe the bug

When using the FixtureMonkey library to generate fixtures for a Kotlin sealed class, the process fails if the sealed class contains an object declaration. The error message indicates that a primary constructor is not provided for the object class, which leads to fixture generation failure.

Your environment

• version of Fixture Monkey: 1.1.6
• version of Java/Kotlin : kotlin, 2.0.20

Steps to reproduce

class FixtureMonkeyTest {

    @Test
    fun `test fixtureMonkey`() {
        val sampled = FixtureMonkeyBuilder()
            .plugin(KotlinPlugin())
            .build()
            .giveMeKotlinBuilder<MyData>()
            .set(MyData::name, "my_name")
            .sample()

        println("sampled: $sampled")

    }

    data class MyData(
        val id: Int,
        val name: String,
        val scheme: Scheme,
    )

    sealed class Scheme {
        data class Url(val scheme: String) : Scheme()
        data object None : Scheme()
    }
}

Expected behaviour

scheme property in MyData class could be initialized with arbitrarily one of Scheme.Url(String). Scheme.None

Actual behaviour

No kotlin primary constructor provided for class com.fixturetest.FixtureMonkeyTest$Scheme$None
java.lang.IllegalArgumentException: No kotlin primary constructor provided for class com.fixturetest.FixtureMonkeyTest$Scheme$None
	at com.navercorp.fixturemonkey.kotlin.type.KotlinTypeCacheKt$kotlinPrimaryConstructor$1.invoke(KotlinTypeCache.kt:51)
	at com.navercorp.fixturemonkey.kotlin.type.KotlinTypeCacheKt$kotlinPrimaryConstructor$1.invoke(KotlinTypeCache.kt:49)
	at com.navercorp.fixturemonkey.kotlin.type.KotlinTypeCacheKt.kotlinPrimaryConstructor$lambda$4(KotlinTypeCache.kt:49)
	at java.base/java.util.Map.computeIfAbsent(Map.java:1054)
	at com.navercorp.fixturemonkey.kotlin.type.KotlinTypeCacheKt.kotlinPrimaryConstructor(KotlinTypeCache.kt:49)
	at com.navercorp.fixturemonkey.kotlin.introspector.PrimaryConstructorArbitraryIntrospector$Companion$PROPERTY_GENERATOR$1.invoke(PrimaryConstructorArbitraryIntrospector.kt:87)
	at com.navercorp.fixturemonkey.kotlin.introspector.PrimaryConstructorArbitraryIntrospector$Companion$PROPERTY_GENERATOR$1.invoke(PrimaryConstructorArbitraryIntrospector.kt:86)
	at com.navercorp.fixturemonkey.kotlin.property.KotlinConstructorParameterPropertyGenerator$generateChildProperties$1.invoke(KotlinConstructorParameterPropertyGenerator.kt:45)
	at com.navercorp.fixturemonkey.kotlin.property.KotlinConstructorParameterPropertyGenerator$generateChildProperties$1.invoke(KotlinConstructorParameterPropertyGenerator.kt:44)
	at com.navercorp.fixturemonkey.kotlin.property.KotlinConstructorParameterPropertyGenerator.generateChildProperties$lambda$0(KotlinConstructorParameterPropertyGenerator.kt:44)
	at java.base/java.util.Map.computeIfAbsent(Map.java:1054)
	at com.navercorp.fixturemonkey.kotlin.property.KotlinConstructorParameterPropertyGenerator.generateChildProperties(KotlinConstructorParameterPropertyGenerator.kt:44)
	at com.navercorp.fixturemonkey.api.property.CompositePropertyGenerator.generateChildProperties(CompositePropertyGenerator.java:57)
	at com.navercorp.fixturemonkey.builder.ArbitraryBuilderContext.lambda$initializeResolvedPropertyGenerator$2(ArbitraryBuilderContext.java:310)
	at com.navercorp.fixturemonkey.api.property.LazyPropertyGenerator.lambda$null$0(LazyPropertyGenerator.java:50)
	at com.navercorp.fixturemonkey.api.lazy.UnSafeLazyArbitraryImpl.getValue(UnSafeLazyArbitraryImpl.java:53)
	at com.navercorp.fixturemonkey.api.property.LazyPropertyGenerator.generateChildProperties(LazyPropertyGenerator.java:51)
	at com.navercorp.fixturemonkey.api.tree.TreeProperty.lambda$toArbitraryProperty$0(TreeProperty.java:85)
	at java.base/java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:197)
	at java.base/java.util.ArrayList$ArrayListSpliterator.forEachRemaining(ArrayList.java:1625)
	at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:509)
	at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:499)
	at java.base/java.util.stream.ReduceOps$ReduceOp.evaluateSequential(ReduceOps.java:921)
	at java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)
	at java.base/java.util.stream.ReferencePipeline.collect(ReferencePipeline.java:682)
	at com.navercorp.fixturemonkey.api.tree.TreeProperty.toArbitraryProperty(TreeProperty.java:87)
	at com.navercorp.fixturemonkey.api.tree.DefaultTraverseNode.generateObjectNode(DefaultTraverseNode.java:335)
	at com.navercorp.fixturemonkey.api.tree.DefaultTraverseNode.generateChildrenNodes(DefaultTraverseNode.java:464)
	at com.navercorp.fixturemonkey.api.tree.DefaultTraverseNode.lambda$expand$1(DefaultTraverseNode.java:230)
	at java.base/java.util.stream.ReferencePipeline$7$1.accept(ReferencePipeline.java:273)
	at java.base/java.util.ArrayList$ArrayListSpliterator.forEachRemaining(ArrayList.java:1625)
	at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:509)
	at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:499)
	at java.base/java.util.stream.ReduceOps$ReduceOp.evaluateSequential(ReduceOps.java:921)
	at java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)
	at java.base/java.util.stream.ReferencePipeline.collect(ReferencePipeline.java:682)
	at com.navercorp.fixturemonkey.api.tree.DefaultTraverseNode.expand(DefaultTraverseNode.java:239)
	at com.navercorp.fixturemonkey.tree.ObjectNode.expand(ObjectNode.java:70)
	at com.navercorp.fixturemonkey.tree.MetadataCollector.collect(MetadataCollector.java:66)
	at com.navercorp.fixturemonkey.tree.MetadataCollector.collect(MetadataCollector.java:54)
	at com.navercorp.fixturemonkey.tree.ObjectTree.<init>(ObjectTree.java:48)
	at com.navercorp.fixturemonkey.resolver.ArbitraryResolver.lambda$resolve$2(ArbitraryResolver.java:69)
	at com.navercorp.fixturemonkey.api.lazy.UnSafeLazyArbitraryImpl.getValue(UnSafeLazyArbitraryImpl.java:53)
	at com.navercorp.fixturemonkey.resolver.ResolvedCombinableArbitrary.lambda$new$0(ResolvedCombinableArbitrary.java:63)
	at com.navercorp.fixturemonkey.api.lazy.UnSafeLazyArbitraryImpl.getValue(UnSafeLazyArbitraryImpl.java:53)
	at com.navercorp.fixturemonkey.resolver.ResolvedCombinableArbitrary.combined(ResolvedCombinableArbitrary.java:75)
	at com.navercorp.fixturemonkey.builder.DefaultArbitraryBuilder.sample(DefaultArbitraryBuilder.java:483)
	at com.navercorp.fixturemonkey.kotlin.KotlinTypeDefaultArbitraryBuilder.sample(FixtureMonkeyExtensions.kt:245)
	at com.fixturetest.FixtureMonkeyTest.test fixtureMonkey(FixtureMonkeyTest.kt:17)
	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:77)
	at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.base/java.lang.reflect.Method.invoke(Method.java:569)
	at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:59)
	at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
	at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:56)
	at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
	at org.junit.runners.ParentRunner$3.evaluate(ParentRunner.java:306)
	at org.junit.runners.BlockJUnit4ClassRunner$1.evaluate(BlockJUnit4ClassRunner.java:100)
	at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:366)
	at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:103)
	at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:63)
	at org.junit.runners.ParentRunner$4.run(ParentRunner.java:331)
	at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:79)
	at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:329)
	at org.junit.runners.ParentRunner.access$100(ParentRunner.java:66)
	at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:293)
	at org.junit.runners.ParentRunner$3.evaluate(ParentRunner.java:306)
	at org.junit.runners.ParentRunner.run(ParentRunner.java:413)
	at org.gradle.api.internal.tasks.testing.junit.JUnitTestClassExecutor.runTestClass(JUnitTestClassExecutor.java:112)
	at org.gradle.api.internal.tasks.testing.junit.JUnitTestClassExecutor.execute(JUnitTestClassExecutor.java:58)
	at org.gradle.api.internal.tasks.testing.junit.JUnitTestClassExecutor.execute(JUnitTestClassExecutor.java:40)
	at org.gradle.api.internal.tasks.testing.junit.AbstractJUnitTestClassProcessor.processTestClass(AbstractJUnitTestClassProcessor.java:54)
	at org.gradle.api.internal.tasks.testing.SuiteTestClassProcessor.processTestClass(SuiteTestClassProcessor.java:53)
	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:77)
	at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.base/java.lang.reflect.Method.invoke(Method.java:569)
	at org.gradle.internal.dispatch.ReflectionDispatch.dispatch(ReflectionDispatch.java:36)
	at org.gradle.internal.dispatch.ReflectionDispatch.dispatch(ReflectionDispatch.java:24)
	at org.gradle.internal.dispatch.ContextClassLoaderDispatch.dispatch(ContextClassLoaderDispatch.java:33)
	at org.gradle.internal.dispatch.ProxyDispatchAdapter$DispatchingInvocationHandler.invoke(ProxyDispatchAdapter.java:92)
	at jdk.proxy1/jdk.proxy1.$Proxy4.processTestClass(Unknown Source)
	at org.gradle.api.internal.tasks.testing.worker.TestWorker$2.run(TestWorker.java:181)
	at org.gradle.api.internal.tasks.testing.worker.TestWorker.executeAndMaintainThreadName(TestWorker.java:130)
	at org.gradle.api.internal.tasks.testing.worker.TestWorker.execute(TestWorker.java:101)
	at org.gradle.api.internal.tasks.testing.worker.TestWorker.execute(TestWorker.java:61)
	at org.gradle.process.internal.worker.child.ActionExecutionWorker.execute(ActionExecutionWorker.java:56)
	at org.gradle.process.internal.worker.child.SystemApplicationClassLoaderWorker.call(SystemApplicationClassLoaderWorker.java:122)
	at org.gradle.process.internal.worker.child.SystemApplicationClassLoaderWorker.call(SystemApplicationClassLoaderWorker.java:69)
	at worker.org.gradle.process.internal.worker.GradleWorkerMain.run(GradleWorkerMain.java:69)
	at worker.org.gradle.process.internal.worker.GradleWorkerMain.main(GradleWorkerMain.java:74)

[seongahjo]

@forgreen0624
Hi.

I cannot reproduce the case. Can you check it if it is the right case?

Thank you.