Test generation for `infix` function may generate exception because `UtUtils` not found by other part of code

[tyuldashev]

Description

Exception NoSuchElementException: Array is empty thrown during test generation for Kotlin class

To Reproduce

Steps to reproduce the behavior:

1. In UTBot settings set Generated test language to Kotlin other leave default
2. It seems that test root should be empty, so remove everything previously generated including packages
3. Generate tests for following code

class Person(val name: String) {
    val likedPeople = mutableListOf<Person>()
    infix fun likes(other: Person): MutableList<Person> {
        likedPeople.add(other); return likedPeople; }
}

Expected behavior

Tests are generated without errors.

Actual behavior

Exception thrown at the end of test generation

Visual proofs (screenshots, logs, images)

...
java.util.NoSuchElementException: Array is empty.
	at kotlin.collections.ArraysKt___ArraysKt.first(_Arrays.kt:1012)
	at org.utbot.intellij.plugin.generator.CodeGenerationController$createOrUpdateUtilClass$$inlined$runReadAction$1.compute(actions.kt:60)
	at com.intellij.openapi.application.impl.ApplicationImpl.runReadAction(ApplicationImpl.java:928)
	at org.utbot.intellij.plugin.generator.CodeGenerationController.createOrUpdateUtilClass(CodeGenerationController.kt:891)
	at org.utbot.intellij.plugin.generator.CodeGenerationController.createUtilityClassIfNeed(CodeGenerationController.kt:227)
	at org.utbot.intellij.plugin.generator.CodeGenerationController.access$createUtilityClassIfNeed(CodeGenerationController.kt:81)
	at org.utbot.intellij.plugin.generator.CodeGenerationController$generateTests$2$1$1$1.run(CodeGenerationController.kt:151)
	at org.utbot.intellij.plugin.util.IntelliJApiHelper$run$wrapper$1.run(IntelliJApiHelper.kt:26)
	at org.utbot.intellij.plugin.util.IntelliJApiHelper$run$$inlined$runWriteAction$1.compute(actions.kt:60)
	at com.intellij.openapi.application.impl.ApplicationImpl.lambda$runWriteAction$13(ApplicationImpl.java:1032)
	at com.intellij.openapi.application.impl.ApplicationImpl.runWriteActionWithClass(ApplicationImpl.java:1011)
	at com.intellij.openapi.application.impl.ApplicationImpl.runWriteAction(ApplicationImpl.java:1032)
	at org.utbot.intellij.plugin.util.IntelliJApiHelper.run(IntelliJApiHelper.kt:62)
	at org.utbot.intellij.plugin.generator.CodeGenerationController$generateTests$2$1$1.run(CodeGenerationController.kt:150)
	at org.utbot.intellij.plugin.util.IntelliJApiHelper$run$wrapper$1.run(IntelliJApiHelper.kt:26)
	at org.utbot.intellij.plugin.util.IntelliJApiHelper$run$$inlined$invokeLater$1.run(ApplicationUtils.kt:94)
	at com.intellij.openapi.application.TransactionGuardImpl.runWithWritingAllowed(TransactionGuardImpl.java:209)
	at com.intellij.openapi.application.TransactionGuardImpl.access$100(TransactionGuardImpl.java:21)
	at com.intellij.openapi.application.TransactionGuardImpl$1.run(TransactionGuardImpl.java:191)
	at com.intellij.openapi.application.impl.ApplicationImpl.runIntendedWriteActionOnCurrentThread(ApplicationImpl.java:881)
	at com.intellij.openapi.application.impl.ApplicationImpl$3.run(ApplicationImpl.java:513)
	at com.intellij.openapi.application.impl.FlushQueue.doRun(FlushQueue.java:75)
	at com.intellij.openapi.application.impl.FlushQueue.runNextEvent(FlushQueue.java:118)
	at com.intellij.openapi.application.impl.FlushQueue.flushNow(FlushQueue.java:42)
	at java.desktop/java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:318)
	at java.desktop/java.awt.EventQueue.dispatchEventImpl(EventQueue.java:779)
	at java.desktop/java.awt.EventQueue$4.run(EventQueue.java:730)
	at java.desktop/java.awt.EventQueue$4.run(EventQueue.java:724)
	at java.base/java.security.AccessController.doPrivileged(AccessController.java:399)
	at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:86)
	at java.desktop/java.awt.EventQueue.dispatchEvent(EventQueue.java:749)
	at com.intellij.ide.IdeEventQueue.defaultDispatchEvent(IdeEventQueue.java:918)
	at com.intellij.ide.IdeEventQueue._dispatchEvent(IdeEventQueue.java:766)
	at com.intellij.ide.IdeEventQueue.lambda$dispatchEvent$6(IdeEventQueue.java:450)
	at com.intellij.openapi.progress.impl.CoreProgressManager.computePrioritized(CoreProgressManager.java:791)
	at com.intellij.ide.IdeEventQueue.lambda$dispatchEvent$7(IdeEventQueue.java:449)
	at com.intellij.openapi.application.TransactionGuardImpl.performActivity(TransactionGuardImpl.java:105)
	at com.intellij.ide.IdeEventQueue.performActivity(IdeEventQueue.java:624)
	at com.intellij.ide.IdeEventQueue.lambda$dispatchEvent$8(IdeEventQueue.java:447)
	at com.intellij.openapi.application.impl.ApplicationImpl.runIntendedWriteActionOnCurrentThread(ApplicationImpl.java:881)
	at com.intellij.ide.IdeEventQueue.dispatchEvent(IdeEventQueue.java:493)
	at java.desktop/java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:207)
	at java.desktop/java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:128)
	at java.desktop/java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:117)
	at java.desktop/java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:113)
	at java.desktop/java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:105)
	at java.desktop/java.awt.EventDispatchThread.run(EventDispatchThread.java:92)

Additional context

That seems happen only once after IDEA start, so if it's not reproducible immediately please try to remove everything under test source root and restart IDEA.

Problem with deepEquals() described in #1255

[volivan239]

Seems like the problem is indeed in that when we first create UtUtils it is somewhy not found be the other parts of code. @tyuldashev could you please update issue title so it would be more precise?

[volivan239]

Can't reproduce the issue in sandbox even after clearing test source (including package directories) and restarting IDEA :( Maybe full clean is needed...

Also, am I correct that this issue is not reproducible in Java?

[tyuldashev]

Still reproducible for me with 2022.10.490 UTBot version.

Right, that's only when I generate test for Java.