Test the Cupcake app: Android Basics with Compose 5. Write Navigation Tests: Test failing

[cygnus-sawyer]

URL of codelab
https://developer.android.com/codelabs/basic-android-kotlin-compose-test-cupcake#4

In which task and step of the codelab can this issue be found?
Test The Cupcake App, 5.Write Navigation Tests, Step 2.

Describe the problem
I added the test described in Step 2:
@Test
fun cupcakeNavHost_verifyStartDestination() {
assertEquals(CupcakeScreen.Start.name, navController.currentBackStackEntry?.destination?.route)
}

But when I run this test, it fails.

I downloaded the solution code and opened that project and ran the test there, and it fails there as well.

Steps to reproduce?

1. Go to cupcakeNavHost_verifyStartDestination() in the editor
2. Click on the green arrow in the margin to the left of the function
3. See error "FAILURE: Build failed with an exception."

Versions
Android Studio Ladybug Feature Drop | 2024.2.2
Build #AI-242.23726.103.2422.12816248, built on December 17, 2024
Runtime version: 21.0.4+-12508038-b607.1 amd64
VM: OpenJDK 64-Bit Server VM by JetBrains s.r.o.
Toolkit: sun.awt.windows.WToolkit
Windows 11.0
GC: G1 Young Generation, G1 Concurrent GC, G1 Old Generation
Memory: 4054M
Cores: 20
Registry:
ide.experimental.ui=true
i18n.locale=
Non-Bundled Plugins:
IdeaVIM (2.19.0)

Additional information
I can't tell from the build output what the problem is. It just says this:

Task :app:connectedDebugAndroidTest FAILED

FAILURE: Build failed with an exception.

• What went wrong:
  Execution failed for task ':app:connectedDebugAndroidTest'.

There were failing tests. See the report at: file:///C:/Users/doner/Projects/AndroidStudio/Cupcake/app/build/reports/androidTests/connected/debug/index.html

---

When I open that index.html file, it just shows "0 tests 0 failures 0 skipped" as if it never ran the test at all.

[cygnus-sawyer]

The test works ok (in both my project and the solution code project) if I run it on an emulator using Android 13.0 "Tiramisu" x86_64. But it doesn't work on an emulator running Android 15.0 "VanillaIceCream" x86_64. Why is that, and how can you determine this from the build files, and how can it be fixed to work on all emulators?

[cygnus-sawyer]

Here's the stack trace when I run it on the Android 15.0 emulator:

> Task :app:connectedDebugAndroidTest
Unknown platform error occurred when running the UTP test suite. Please check logs for details.
java.lang.NullPointerException
	at com.google.testing.platform.executor.SingleDeviceExecutor$execute$3.invoke(SingleDeviceExecutor.kt:101)
	at com.google.testing.platform.executor.SingleDeviceExecutor$execute$3.invoke(SingleDeviceExecutor.kt:100)
	at com.google.testing.platform.result.TestResultListenerManager.afterTestSuite(TestResultListenerManager.kt:139)
	at com.google.testing.platform.executor.SingleDeviceExecutor.execute(SingleDeviceExecutor.kt:115)
	at com.google.testing.platform.RunnerImpl.run(RunnerImpl.kt:117)
	at com.google.testing.platform.server.strategy.NonInteractiveServerStrategy$run$5.invoke(NonInteractiveServerStrategy.kt:95)
	at com.google.testing.platform.server.strategy.NonInteractiveServerStrategy$run$5.invoke(NonInteractiveServerStrategy.kt:94)
	at com.google.testing.platform.core.telemetry.common.noop.NoopDiagnosticsScope.recordEvent(NoopDiagnosticsScope.kt:35)
	at com.google.testing.platform.core.telemetry.TelemetryKt.recordEvent(Telemetry.kt:66)
	at com.google.testing.platform.server.strategy.NonInteractiveServerStrategy.run(NonInteractiveServerStrategy.kt:94)
	at com.google.testing.platform.main.MainKt$main$4.invokeSuspend(Main.kt:75)
	at kotlin.coroutines.jvm.internal.BaseContinuationImpl.resumeWith(ContinuationImpl.kt:33)
	at kotlinx.coroutines.DispatchedTask.run(DispatchedTask.kt:106)
	at kotlinx.coroutines.EventLoopImplBase.processNextEvent(EventLoop.common.kt:279)
	at kotlinx.coroutines.BlockingCoroutine.joinBlocking(Builders.kt:85)
	at kotlinx.coroutines.BuildersKt__BuildersKt.runBlocking(Builders.kt:59)
	at kotlinx.coroutines.BuildersKt.runBlocking(Unknown Source)
	at kotlinx.coroutines.BuildersKt__BuildersKt.runBlocking$default(Builders.kt:38)
	at kotlinx.coroutines.BuildersKt.runBlocking$default(Unknown Source)
	at com.google.testing.platform.main.MainKt.main(Main.kt:73)
	at com.google.testing.platform.main.MainKt.main$default(Main.kt:35)
	at com.google.testing.platform.main.MainKt.main(Main.kt)
	at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(Unknown Source)
	at java.base/java.lang.reflect.Method.invoke(Unknown Source)
	at com.google.testing.platform.launcher.Launcher.main(Launcher.java:149)

[antmanzz]

The version number of lifecycle_version in build.gradle.kts (Cupcake) is broken. Copilot suggest the number 2.9.3 as the most actual version but now the project require a version of Android Gradle plugin 8.6.0 or higher, then it's necessary change this file with this content:

buildscript {
extra.apply {
// before 2.6.2
set("lifecycle_version", "2.9.3")
}
}
plugins {
// before 8.1.2
id("com.android.application") version "8.6.0" apply false
// before 8.1.2
id("com.android.library") version "8.6.0" apply false
id("org.jetbrains.kotlin.android") version "1.9.10" apply false
}

However, also it's necessary two changes more. The first, it's required a Gradle version 8.7 or higher, then in gradle-wrapper.properties the content need to be:

distributionBase=GRADLE_USER_HOME
distributionPath=wrapper/dists
# before gradle-8.4-bin-.zip
distributionUrl=https://services.gradle.org/distributions/gradle-8.7-bin.zip
zipStoreBase=GRADLE_USER_HOME
zipStorePath=wrapper/dists

And the second refers to build.gradle.kts (app) whose content must to specify the compile SDK 35 as lowest:

plugins {
// plugins
}
android {
namespace = "com.example.cupcake"
// before 34
compileSdk = 35
// more configurations
}
dependencies {
// dependencies
}

With this changes I can run test code in a Android 15.0 emulator.