[jvm] duplicated filename creates exceptions when updating snapshot

[AlbRoehm]

There is a possible issue that I encountered with duplicated file names of tests. (in different packages). The assertion was marked for overwrite with toBe_TODO() and the following exception was thrown:

[com.diffplug.selfie.junit5.SelfieTestExecutionListener] threw exception for method: testPlanExecutionFinished(org.junit.platform.launcher.TestPlan@65b49da9) java.lang.AssertionError: Expected to find inline assertion on line ... 

With some debugging i found that there was a file with a identical name red with different content instead of the correct one, before the exception was thrown.

Also I'm not sure if this a known limitation or a bug

[nedtwigg]

Huh. Definitely sounds like a bug. Can you share more detail in the stacktrace or the package names causing the conflict?

[AlbRoehm]

The package/file name is base.routes.internal.RequestRoutesTest.kt and base.routes.exposed.RequestRoutesTest.kt. The test itself ends successfully, but the gradle logs contain the following stacktrace. Playing around the file name showed that moving to two different names hides the issue and moving to anything else identical for both files brings it back.

I will try to setup a minimal example to see if I can reproduce it more easily.

RequestRoutesTest > PostRequest > Provide invalid authentication, returns auth failure() PASSED

Oct 14, 2025 3:44:28 PM org.junit.platform.launcher.core.CompositeTestExecutionListener lambda$notifyEach$21
WARNING: TestExecutionListener [com.diffplug.selfie.junit5.SelfieTestExecutionListener] threw exception for method: testPlanExecutionFinished(org.junit.platform.launcher.TestPlan@7e642f83)
java.lang.AssertionError: Expected to find inline assertion on line 136, but there was only `                        ): Either<Problem, Request> = testNotImplemented()`
	at com.diffplug.selfie.guts.SourceFile.parseToBeLike(SourceFile.kt:119)
	at com.diffplug.selfie.guts.InlineWriteTracker.persistWrites(WriteTracker.kt:215)
	at com.diffplug.selfie.junit5.SnapshotSystemJUnit5.finishedAllTests(SnapshotSystemJUnit5.kt:111)
	at com.diffplug.selfie.junit5.SelfieTestExecutionListener.testPlanExecutionFinished(SelfieTestExecutionListener.kt:75)
	at org.junit.platform.launcher.core.CompositeTestExecutionListener.lambda$testPlanExecutionFinished$14(CompositeTestExecutionListener.java:88)
	at org.junit.platform.launcher.core.CompositeTestExecutionListener.lambda$notifyEach$21(CompositeTestExecutionListener.java:110)
	at org.junit.platform.commons.util.CollectionUtils.forEachInReverseOrder(CollectionUtils.java:263)
	at org.junit.platform.launcher.core.IterationOrder$2.forEach(IterationOrder.java:30)
	at org.junit.platform.launcher.core.CompositeTestExecutionListener.notifyEach(CompositeTestExecutionListener.java:108)
	at org.junit.platform.launcher.core.CompositeTestExecutionListener.testPlanExecutionFinished(CompositeTestExecutionListener.java:87)
	at org.junit.platform.launcher.core.EngineExecutionOrchestrator.execute(EngineExecutionOrchestrator.java:105)
	at org.junit.platform.launcher.core.EngineExecutionOrchestrator.lambda$execute$0(EngineExecutionOrchestrator.java:64)
	at org.junit.platform.launcher.core.EngineExecutionOrchestrator.withInterceptedStreams(EngineExecutionOrchestrator.java:150)
	at org.junit.platform.launcher.core.EngineExecutionOrchestrator.execute(EngineExecutionOrchestrator.java:63)
	at org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java:109)
	at org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java:91)
	at org.junit.platform.launcher.core.DelegatingLauncher.execute(DelegatingLauncher.java:47)
	at org.junit.platform.launcher.core.InterceptingLauncher.lambda$execute$1(InterceptingLauncher.java:39)
	at org.junit.platform.launcher.core.ClasspathAlignmentCheckingLauncherInterceptor.intercept(ClasspathAlignmentCheckingLauncherInterceptor.java:25)
	at org.junit.platform.launcher.core.InterceptingLauncher.execute(InterceptingLauncher.java:38)
	at org.junit.platform.launcher.core.DelegatingLauncher.execute(DelegatingLauncher.java:47)
	at org.gradle.api.internal.tasks.testing.junitplatform.JUnitPlatformTestClassProcessor$CollectAllTestClassesExecutor.processAllTestClasses(JUnitPlatformTestClassProcessor.java:124)
	at org.gradle.api.internal.tasks.testing.junitplatform.JUnitPlatformTestClassProcessor$CollectAllTestClassesExecutor.access$000(JUnitPlatformTestClassProcessor.java:99)
	at org.gradle.api.internal.tasks.testing.junitplatform.JUnitPlatformTestClassProcessor.stop(JUnitPlatformTestClassProcessor.java:94)
	at org.gradle.api.internal.tasks.testing.SuiteTestClassProcessor.stop(SuiteTestClassProcessor.java:63)
	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:77)
	at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.base/java.lang.reflect.Method.invoke(Method.java:569)
	at org.gradle.internal.dispatch.ReflectionDispatch.dispatch(ReflectionDispatch.java:36)
	at org.gradle.internal.dispatch.ReflectionDispatch.dispatch(ReflectionDispatch.java:24)
	at org.gradle.internal.dispatch.ContextClassLoaderDispatch.dispatch(ContextClassLoaderDispatch.java:33)
	at org.gradle.internal.dispatch.ProxyDispatchAdapter$DispatchingInvocationHandler.invoke(ProxyDispatchAdapter.java:92)
	at jdk.proxy1/jdk.proxy1.$Proxy4.stop(Unknown Source)
	at org.gradle.api.internal.tasks.testing.worker.TestWorker$3.run(TestWorker.java:200)
	at org.gradle.api.internal.tasks.testing.worker.TestWorker.executeAndMaintainThreadName(TestWorker.java:132)
	at org.gradle.api.internal.tasks.testing.worker.TestWorker.execute(TestWorker.java:103)
	at org.gradle.api.internal.tasks.testing.worker.TestWorker.execute(TestWorker.java:63)
	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:72)
	at worker.org.gradle.process.internal.worker.GradleWorkerMain.run(GradleWorkerMain.java:69)
	at worker.org.gradle.process.internal.worker.GradleWorkerMain.main(GradleWorkerMain.java:74)

[AlbRoehm]

Looks like the following lines are enough to force the behavior:

Seems to work for selfie version: 2.5.3 and 2.5.4

package com.a

import com.diffplug.selfie.coroutines.expectSelfie
import kotlinx.coroutines.test.runTest
import org.junit.jupiter.api.Test

class SameName {
    @Test
    fun Scenario() = runTest {
        assert(false) { "This is file a, the wrong file" }
    }
}

package com.b

import com.diffplug.selfie.coroutines.expectSelfie
import kotlinx.coroutines.test.runTest
import org.junit.jupiter.api.Test

class SameName {
    @Test
    fun Scenario() = runTest {
        expectSelfie("123").toBe_TODO()
    }
}

By running test b you get:

Oct 14, 2025 4:04:16 PM org.junit.platform.launcher.core.CompositeTestExecutionListener lambda$notifyEach$21
WARNING: TestExecutionListener [com.diffplug.selfie.junit5.SelfieTestExecutionListener] threw exception for method: testPlanExecutionFinished(org.junit.platform.launcher.TestPlan@27646bb3)
java.lang.AssertionError: Expected to find inline assertion on line 10, but there was only `        assert(false) { "This is file a, the wrong file" }`
	at com.diffplug.selfie.guts.SourceFile.parseToBeLike(SourceFile.kt:119)
	at com.diffplug.selfie.guts.InlineWriteTracker.persistWrites(WriteTracker.kt:215)
	at com.diffplug.selfie.junit5.SnapshotSystemJUnit5.finishedAllTests(SnapshotSystemJUnit5.kt:111)
	at com.diffplug.selfie.junit5.SelfieTestExecutionListener.testPlanExecutionFinished(SelfieTestExecutionListener.kt:75)
	at org.junit.platform.launcher.core.CompositeTestExecutionListener.lambda$testPlanExecutionFinished$14(CompositeTestExecutionListener.java:88)
	at org.junit.platform.launcher.core.CompositeTestExecutionListener.lambda$notifyEach$21(CompositeTestExecutionListener.java:110)
	at org.junit.platform.commons.util.CollectionUtils.forEachInReverseOrder(CollectionUtils.java:263)
	at org.junit.platform.launcher.core.IterationOrder$2.forEach(IterationOrder.java:30)