kotlin.KotlinNullPointerException error when I try to use any() method on a value class parameter

When I try to use any() method on a parameter with a value class as type, I have kotlin.KotlinNullPointerException error.

Expected Behavior

The test should run correctly and the mock can intercept all instance of the value class parameter.

Current Behavior

Generate a kotlin.KotlinNullPointerException error on test execution I don’t have the issue if I replace the value class with data class and I don’t have the issue if I replace the any() call by a explicit instance of the value class.

Steps to Reproduce

See the code below.

Context

• MockK version: 1.12.0
• OS: MacOs 11.5.2 (20G95)
• Kotlin version: 1.5.21, 1.5.30
• JDK version: OpenJDK Runtime Environment AdoptOpenJDK-11.0.11+9 (build 11.0.11+9)
• JUnit version: 5.6.2 (if I belived the depencies tree in IntelliJ)
• Kotest version : 4.6.1, 4.6.2
• Type of test: unit test

Failure Logs

Please include any relevant log snippets or files here.

Stack trace

Test failed
kotlin.KotlinNullPointerException
	at io.mockk.impl.recording.states.RecordingState.matcher(RecordingState.kt:53)
	at io.mockk.impl.recording.CommonCallRecorder.matcher(CommonCallRecorder.kt:52)
	at org.test.HelloTest$1$1$1.invoke(HelloTest.kt:22)
	at org.test.HelloTest$1$1$1.invoke(HelloTest.kt:12)
	at io.mockk.impl.eval.RecordedBlockEvaluator$record$block$1.invoke(RecordedBlockEvaluator.kt:25)
	at io.mockk.impl.eval.RecordedBlockEvaluator$enhanceWithRethrow$1.invoke(RecordedBlockEvaluator.kt:78)
	at io.mockk.impl.recording.JvmAutoHinter.autoHint(JvmAutoHinter.kt:23)
	at io.mockk.impl.eval.RecordedBlockEvaluator.record(RecordedBlockEvaluator.kt:40)
	at io.mockk.impl.eval.EveryBlockEvaluator.every(EveryBlockEvaluator.kt:30)
	at io.mockk.MockKDsl.internalEvery(API.kt:92)
	at io.mockk.MockKKt.every(MockK.kt:98)
	at org.test.HelloTest$1$1.invokeSuspend(HelloTest.kt:12)
	at org.test.HelloTest$1$1.invoke(HelloTest.kt)
	at org.test.HelloTest$1$1.invoke(HelloTest.kt)
	at io.kotest.core.internal.ExecutionsKt$executeWithBehaviours$2$1.invokeSuspend(executions.kt:13)
	at io.kotest.core.internal.ExecutionsKt$executeWithBehaviours$2$1.invoke(executions.kt)
	at io.kotest.core.internal.ExecutionsKt$executeWithBehaviours$2$1.invoke(executions.kt)
	at io.kotest.core.internal.ExecutionsKt.wrapTestWithGlobalAssert(executions.kt:39)
	at io.kotest.core.internal.ExecutionsKt.access$wrapTestWithGlobalAssert(executions.kt:1)
	at io.kotest.core.internal.ExecutionsKt$executeWithBehaviours$2.invokeSuspend(executions.kt:12)
	at io.kotest.core.internal.ExecutionsKt$executeWithBehaviours$2.invoke(executions.kt)
	at io.kotest.core.internal.ExecutionsKt$executeWithBehaviours$2.invoke(executions.kt)
	at io.kotest.core.internal.ExecutionsKt$wrapTestWithAssertionModeCheck$2.invokeSuspend(executions.kt:25)
	at io.kotest.core.internal.ExecutionsKt$wrapTestWithAssertionModeCheck$2.invoke(executions.kt)
	at io.kotest.core.internal.ExecutionsKt$wrapTestWithAssertionModeCheck$2.invoke(executions.kt)
	at io.kotest.core.internal.AssertionsCheckKt.executeWithAssertionsCheck(assertionsCheck.kt:25)
	at io.kotest.core.internal.ExecutionsKt.wrapTestWithAssertionModeCheck(executions.kt:24)
	at io.kotest.core.internal.ExecutionsKt.executeWithBehaviours(executions.kt:11)
	at io.kotest.core.internal.TestCaseExecutor$executeInScope$2.invokeSuspend(TestCaseExecutor.kt:268)
	at io.kotest.core.internal.TestCaseExecutor$executeInScope$2.invoke(TestCaseExecutor.kt)
	at io.kotest.core.internal.TestCaseExecutor$executeInScope$2.invoke(TestCaseExecutor.kt)
	at kotlinx.coroutines.intrinsics.UndispatchedKt.startUndispatchedOrReturn(Undispatched.kt:89)
	at kotlinx.coroutines.CoroutineScopeKt.coroutineScope(CoroutineScope.kt:264)
	at io.kotest.core.internal.TestCaseExecutor.executeInScope(TestCaseExecutor.kt:262)
	at io.kotest.core.internal.TestCaseExecutor.access$executeInScope(TestCaseExecutor.kt:57)
	at io.kotest.core.internal.TestCaseExecutor$executeAndWait$4$1$1$3$1$1.invokeSuspend(TestCaseExecutor.kt:234)
	at io.kotest.core.internal.TestCaseExecutor$executeAndWait$4$1$1$3$1$1.invoke(TestCaseExecutor.kt)
	at io.kotest.core.internal.TestCaseExecutor$executeAndWait$4$1$1$3$1$1.invoke(TestCaseExecutor.kt)
	at kotlinx.coroutines.intrinsics.UndispatchedKt.startUndispatchedOrReturnIgnoreTimeout(Undispatched.kt:100)
	at kotlinx.coroutines.TimeoutKt.setupTimeout(Timeout.kt:148)
	at kotlinx.coroutines.TimeoutKt.withTimeout(Timeout.kt:44)
	at io.kotest.core.internal.TestCaseExecutor$executeAndWait$4$1$1$3$1.invokeSuspend(TestCaseExecutor.kt:233)
	at io.kotest.core.internal.TestCaseExecutor$executeAndWait$4$1$1$3$1.invoke(TestCaseExecutor.kt)
	at io.kotest.core.internal.TestCaseExecutor$executeAndWait$4$1$1$3$1.invoke(TestCaseExecutor.kt)
	at io.kotest.engine.ExecutorExecutionContext$executeWithTimeoutInterruption$4.invokeSuspend(ExecutorExecutionContext.kt:77)
	at io.kotest.engine.ExecutorExecutionContext$executeWithTimeoutInterruption$4.invoke(ExecutorExecutionContext.kt)
	at io.kotest.engine.ExecutorExecutionContext$executeWithTimeoutInterruption$4.invoke(ExecutorExecutionContext.kt)
	at kotlinx.coroutines.intrinsics.UndispatchedKt.startUndispatchedOrReturn(Undispatched.kt:89)
	at kotlinx.coroutines.BuildersKt__Builders_commonKt.withContext(Builders.common.kt:165)
	at kotlinx.coroutines.BuildersKt.withContext(Unknown Source)
	at io.kotest.engine.ExecutorExecutionContext.executeWithTimeoutInterruption(ExecutorExecutionContext.kt:75)
	at io.kotest.core.internal.TestCaseExecutor$executeAndWait$4$1$1$3.invokeSuspend(TestCaseExecutor.kt:232)
	at io.kotest.core.internal.TestCaseExecutor$executeAndWait$4$1$1$3.invoke(TestCaseExecutor.kt)
	at io.kotest.core.internal.TestCaseExecutor$executeAndWait$4$1$1$3.invoke(TestCaseExecutor.kt)
	at io.kotest.mpp.ReplayKt.replay(replay.kt:18)
	at io.kotest.core.internal.TestCaseExecutor$executeAndWait$4$1$1.invokeSuspend(TestCaseExecutor.kt:227)
	at io.kotest.core.internal.TestCaseExecutor$executeAndWait$4$1$1.invoke(TestCaseExecutor.kt)
	at io.kotest.core.internal.TestCaseExecutor$executeAndWait$4$1$1.invoke(TestCaseExecutor.kt)
	at io.kotest.engine.ExecutorExecutionContext$executeWithTimeoutInterruption$4.invokeSuspend(ExecutorExecutionContext.kt:77)
	at io.kotest.engine.ExecutorExecutionContext$executeWithTimeoutInterruption$4.invoke(ExecutorExecutionContext.kt)
	at io.kotest.engine.ExecutorExecutionContext$executeWithTimeoutInterruption$4.invoke(ExecutorExecutionContext.kt)
	at kotlinx.coroutines.intrinsics.UndispatchedKt.startUndispatchedOrReturn(Undispatched.kt:89)
	at kotlinx.coroutines.BuildersKt__Builders_commonKt.withContext(Builders.common.kt:165)
	at kotlinx.coroutines.BuildersKt.withContext(Unknown Source)
	at io.kotest.engine.ExecutorExecutionContext.executeWithTimeoutInterruption(ExecutorExecutionContext.kt:75)
	at io.kotest.core.internal.TestCaseExecutor$executeAndWait$4$1.invokeSuspend(TestCaseExecutor.kt:220)
	at io.kotest.core.internal.TestCaseExecutor$executeAndWait$4$1.invoke(TestCaseExecutor.kt)
	at io.kotest.core.internal.TestCaseExecutor$executeAndWait$4$1.invoke(TestCaseExecutor.kt)
	at kotlinx.coroutines.intrinsics.UndispatchedKt.startUndispatchedOrReturnIgnoreTimeout(Undispatched.kt:100)
	at kotlinx.coroutines.TimeoutKt.setupTimeout(Timeout.kt:148)
	at kotlinx.coroutines.TimeoutKt.withTimeout(Timeout.kt:44)
	at io.kotest.core.internal.TestCaseExecutor$executeAndWait$4.invokeSuspend(TestCaseExecutor.kt:219)
	at io.kotest.core.internal.TestCaseExecutor$executeAndWait$4.invoke(TestCaseExecutor.kt)
	at io.kotest.core.internal.TestCaseExecutor$executeAndWait$4.invoke(TestCaseExecutor.kt)
	at kotlinx.coroutines.intrinsics.UndispatchedKt.startUndispatchedOrReturn(Undispatched.kt:89)
	at kotlinx.coroutines.SupervisorKt.supervisorScope(Supervisor.kt:57)
	at io.kotest.core.internal.TestCaseExecutor.executeAndWait(TestCaseExecutor.kt:215)
	at io.kotest.core.internal.TestCaseExecutor.invokeTestCase(TestCaseExecutor.kt:184)
	at io.kotest.core.internal.TestCaseExecutor.executeActiveTest(TestCaseExecutor.kt:153)
	at io.kotest.core.internal.TestCaseExecutor.access$executeActiveTest(TestCaseExecutor.kt:57)
	at io.kotest.core.internal.TestCaseExecutor$intercept$innerExecute$1$1.invokeSuspend(TestCaseExecutor.kt:89)
	at io.kotest.core.internal.TestCaseExecutor$intercept$innerExecute$1$1.invoke(TestCaseExecutor.kt)
	at io.kotest.core.internal.TestCaseExecutor$intercept$innerExecute$1$1.invoke(TestCaseExecutor.kt)
	at io.kotest.core.internal.TestCaseExecutor.executeIfEnabled(TestCaseExecutor.kt:117)
	at io.kotest.core.internal.TestCaseExecutor.access$executeIfEnabled(TestCaseExecutor.kt:57)
	at io.kotest.core.internal.TestCaseExecutor$intercept$innerExecute$1.invokeSuspend(TestCaseExecutor.kt:89)
	at io.kotest.core.internal.TestCaseExecutor$intercept$innerExecute$1.invoke(TestCaseExecutor.kt)
	at io.kotest.core.internal.TestCaseExecutor$intercept$innerExecute$1.invoke(TestCaseExecutor.kt)
	at io.kotest.core.internal.TestCaseExecutor.intercept(TestCaseExecutor.kt:103)
	at io.kotest.core.internal.TestCaseExecutor.execute(TestCaseExecutor.kt:69)
	at io.kotest.engine.spec.runners.SingleInstanceSpecRunner.runTest(SingleInstanceSpecRunner.kt:104)
	at io.kotest.engine.spec.runners.SingleInstanceSpecRunner.access$runTest(SingleInstanceSpecRunner.kt:34)
	at io.kotest.engine.spec.runners.SingleInstanceSpecRunner$execute$interceptAndRun$2$4.invokeSuspend(SingleInstanceSpecRunner.kt:57)
	at io.kotest.engine.spec.runners.SingleInstanceSpecRunner$execute$interceptAndRun$2$4.invoke(SingleInstanceSpecRunner.kt)
	at io.kotest.engine.spec.runners.SingleInstanceSpecRunner$execute$interceptAndRun$2$4.invoke(SingleInstanceSpecRunner.kt)
	at io.kotest.engine.launchers.SequentialTestLauncher$launch$3$1$1.invokeSuspend(SequentialTestLauncher.kt:22)
	at kotlin.coroutines.jvm.internal.BaseContinuationImpl.resumeWith(ContinuationImpl.kt:33)
	at kotlinx.coroutines.DispatchedTask.run(DispatchedTask.kt:106)
	at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
	at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
	at java.base/java.lang.Thread.run(Thread.java:829)

Minimal reproducible code (the gist of this issue)

plugins {
    kotlin("jvm") version "1.5.21"
}

group = "org.example"
version = "1.0-SNAPSHOT"

repositories {
    mavenCentral()
}

dependencies {
    implementation(kotlin("stdlib"))
    testImplementation("io.kotest:kotest-runner-junit5:4.6.1")
    testImplementation("io.mockk:mockk:1.12.0")
}

package org.test

@JvmInline
value class Name(val value: String)

interface Printer {
    fun print(name: Name): String
}

class Hello(private val printer: Printer) {
    fun hello(name: String) {
        println(printer.print(Name(name)))
    }
}

package org.test

import io.kotest.core.spec.style.ShouldSpec
import io.mockk.every
import io.mockk.mockk

class HelloTest : ShouldSpec({
    val mockPrinter = mockk<Printer>()

    should("print message") {
        every { mockPrinter.print(any()) } returns "OK"

        val hello = Hello(mockPrinter)

        hello.hello("TEST")
    }

})

[adrinieto]

I have the same issue with 1.12.0. As a workaround instead of

every { mockPrinter.print(any()) } returns "OK"

you can use

every { mockPrinter.print(Name(any())) } returns "OK"

[stale[bot]]

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