Unable to calculate new test file name

I have a file lib/core/util/list/chunk_list.dart with contents:


List<List<T>> chunkList<T>(List<T> items, int chunkSize) {}

When I generate Dart Test file following exception is thrown:

java.lang.IllegalStateException: Unable to calculate new test file name
    at com.github.grahamsmith.darttest.actions.CreateDartTestFromIntentionAction.getFilenameSuggestion(CreateDartTestFromIntentionAction.kt:101)
    at com.github.grahamsmith.darttest.actions.CreateDartTestFromIntentionAction.invoke(CreateDartTestFromIntentionAction.kt:44)
    at com.intellij.codeInsight.intention.impl.config.IntentionActionWrapper.invoke(IntentionActionWrapper.java:66)
    at com.intellij.codeInsight.intention.impl.IntentionActionWithTextCaching$MyIntentionAction.invoke(IntentionActionWithTextCaching.java:208)
    at com.intellij.codeInsight.intention.impl.ShowIntentionActionsHandler.lambda$invokeIntention$4(ShowIntentionActionsHandler.java:249)
    at com.intellij.openapi.application.WriteAction.run(WriteAction.java:102)
    at com.intellij.codeInsight.intention.impl.ShowIntentionActionsHandler.invokeIntention(ShowIntentionActionsHandler.java:249)
    at com.intellij.codeInsight.intention.impl.ShowIntentionActionsHandler.lambda$chooseActionAndInvoke$3(ShowIntentionActionsHandler.java:225)
    at com.intellij.openapi.command.impl.CoreCommandProcessor.executeCommand(CoreCommandProcessor.java:220)
    at com.intellij.openapi.command.impl.CoreCommandProcessor.executeCommand(CoreCommandProcessor.java:177)
    at com.intellij.openapi.command.impl.CoreCommandProcessor.executeCommand(CoreCommandProcessor.java:167)
    at com.intellij.openapi.command.impl.CoreCommandProcessor.executeCommand(CoreCommandProcessor.java:153)
    at com.intellij.codeInsight.intention.impl.ShowIntentionActionsHandler.chooseActionAndInvoke(ShowIntentionActionsHandler.java:224)
    at com.intellij.codeInsight.intention.impl.IntentionListStep.lambda$applyAction$3(IntentionListStep.java:128)
    at com.intellij.util.ui.EdtInvocationManager.invokeLaterIfNeeded(EdtInvocationManager.java:88)
    at com.intellij.util.ui.UIUtil.invokeLaterIfNeeded(UIUtil.java:2194)
    at com.intellij.ide.IdeEventQueue.ifFocusEventsInTheQueue(IdeEventQueue.java:188)
    at com.intellij.ide.IdeEventQueue.executeWhenAllFocusEventsLeftTheQueue(IdeEventQueue.java:140)
    at com.intellij.openapi.wm.impl.FocusManagerImpl.doWhenFocusSettlesDown(FocusManagerImpl.java:173)
    at com.intellij.openapi.wm.impl.IdeFocusManagerImpl.doWhenFocusSettlesDown(IdeFocusManagerImpl.java:36)
    at com.intellij.codeInsight.intention.impl.IntentionListStep.lambda$applyAction$4(IntentionListStep.java:127)
    at com.intellij.openapi.application.TransactionGuardImpl.runWithWritingAllowed(TransactionGuardImpl.java:216)
    at com.intellij.openapi.application.TransactionGuardImpl.access$200(TransactionGuardImpl.java:24)
    at com.intellij.openapi.application.TransactionGuardImpl$2.run(TransactionGuardImpl.java:199)
    at com.intellij.openapi.application.impl.ApplicationImpl.runIntendedWriteActionOnCurrentThread(ApplicationImpl.java:828)
    at com.intellij.openapi.application.impl.ApplicationImpl.lambda$invokeLater$4(ApplicationImpl.java:330)
    at com.intellij.openapi.application.impl.FlushQueue.doRun(FlushQueue.java:85)
    at com.intellij.openapi.application.impl.FlushQueue.runNextEvent(FlushQueue.java:134)
    at com.intellij.openapi.application.impl.FlushQueue.flushNow(FlushQueue.java:47)
    at com.intellij.openapi.application.impl.FlushQueue$FlushNow.run(FlushQueue.java:190)
    at java.desktop/java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:313)
    at java.desktop/java.awt.EventQueue.dispatchEventImpl(EventQueue.java:776)
    at java.desktop/java.awt.EventQueue$4.run(EventQueue.java:727)
    at java.desktop/java.awt.EventQueue$4.run(EventQueue.java:721)
    at java.base/java.security.AccessController.doPrivileged(Native Method)
    at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:85)
    at java.desktop/java.awt.EventQueue.dispatchEvent(EventQueue.java:746)
    at com.intellij.ide.IdeEventQueue.defaultDispatchEvent(IdeEventQueue.java:976)
    at com.intellij.ide.IdeEventQueue._dispatchEvent(IdeEventQueue.java:843)
    at com.intellij.ide.IdeEventQueue.lambda$dispatchEvent$8(IdeEventQueue.java:454)
    at com.intellij.openapi.progress.impl.CoreProgressManager.computePrioritized(CoreProgressManager.java:773)
    at com.intellij.ide.IdeEventQueue.lambda$dispatchEvent$9(IdeEventQueue.java:453)
    at com.intellij.openapi.application.impl.ApplicationImpl.runIntendedWriteActionOnCurrentThread(ApplicationImpl.java:828)
    at com.intellij.ide.IdeEventQueue.dispatchEvent(IdeEventQueue.java:501)
    at java.desktop/java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:203)
    at java.desktop/java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:124)
    at java.desktop/java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:113)
    at java.desktop/java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:109)
    at java.desktop/java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
    at java.desktop/java.awt.EventDispatchThread.run(EventDispatchThread.java:90)

Android Studio Version:

Android Studio Arctic Fox | 2020.3.1 Patch 3
Build #AI-203.7717.56.2031.7784292, built on October 1, 2021
Runtime version: 11.0.10+0-b96-7249189 amd64
VM: OpenJDK 64-Bit Server VM by Oracle Corporation
Windows 10 10.0
GC: G1 Young Generation, G1 Old Generation
Memory: 1280M
Cores: 6
Registry: external.system.auto.import.disabled=true
Non-Bundled Plugins: Dart, com.github.grahamsmith.darttest, com.localizely.flutter-intl, org.jetbrains.kotlin, io.flutter, org.intellij.plugins.markdown

grahamsmith / dart-test

Unable to calculate new test file name #5