Problem when running tests with snapshots generated on Windows OS

[xavimolloy]

Hi all, it is probably something silly but we have added snapshot testing to our CI in GitHub Actions.
tests run and are successfull locally. However when we upload the generated images to github and tests run on Github Actions tests fail with a Null pointer exception.

I've reviewed open and closed issues and found some people had similar issues regarding the NPE and that it might be related to Git LFS. it is already implemented on the project, and I have implemented it on my device but I can't seem to find the problem code. Other colleagues in the team use Linuz and when they generate the images and upload them to the repo tests pass successfully everytime without them doing anything differently.

The similar issues I found where only talking about how the NPE exception did not display relevant information and no information on how to resolve the issue.

Has anyone experienced anything similar?

thankfully the project where we have implemented the snapshot tests are public so we can share them without any worries

This is a PR where we have created a new snapshot test that fails if generated on windows but passes when generated on Linux.

PR with new snapshot test:

dhis2/dhis2-mobile-ui#236

Git hub Action that fails if image generated and pushed on windows:

https://github.com/dhis2/dhis2-mobile-ui/actions/runs/9003227033/job/24733378036

Successfull one with same proccess on linux:

https://github.com/dhis2/dhis2-mobile-ui/actions/runs/9004273183

Stacktrace:

1m 17s
Run ./gradlew designsystem:verifyPaparazziDebug

Task :convention-plugins:generateExternalPluginSpecBuilders UP-TO-DATE
Task :convention-plugins:extractPrecompiledScriptPluginPlugins UP-TO-DATE
Task :convention-plugins:compilePluginsBlocks UP-TO-DATE
Task :convention-plugins:generatePrecompiledScriptPluginAccessors UP-TO-DATE
Task :convention-plugins:generateScriptPluginAdapters UP-TO-DATE
Task :convention-plugins:compileKotlin UP-TO-DATE
Task :convention-plugins:compileJava NO-SOURCE
Task :convention-plugins:pluginDescriptors UP-TO-DATE
Task :convention-plugins:processResources UP-TO-DATE
Task :convention-plugins:classes UP-TO-DATE
Task :convention-plugins:jar UP-TO-DATE
Task :convention-plugins:inspectClassesForKotlinIC UP-TO-DATE
Warning: Errors during XML parse:
Warning: Additionally, the fallback loader failed to parse the XML.
Checking the license for package Android SDK Platform-Tools in /usr/local/lib/android/sdk/licenses
License for package Android SDK Platform-Tools accepted.
Preparing "Install Android SDK Platform-Tools v.35.0.1".
"Install Android SDK Platform-Tools v.35.0.1" ready.
Installing Android SDK Platform-Tools in /usr/local/lib/android/sdk/platform-tools
"Install Android SDK Platform-Tools v.35.0.1" complete.
"Install Android SDK Platform-Tools v.35.0.1" finished.
Task :designsystem:checkKotlinGradlePluginConfigurationErrors
Task :designsystem:preBuild UP-TO-DATE
Task :designsystem:preDebugBuild UP-TO-DATE
Task :designsystem:generateDebugResValues
Task :designsystem:generateDebugResources
Task :designsystem:packageDebugResources
Task :designsystem:preDebugUnitTestBuild UP-TO-DATE
Task :designsystem:javaPreCompileDebug
Task :designsystem:processDebugManifest
Task :designsystem:parseDebugLocalResources
Task :designsystem:preparePaparazziDebugResources
Task :designsystem:javaPreCompileDebugUnitTest
Task :designsystem:generateDebugRFile
Task :designsystem:generateDebugUnitTestStubRFile
Task :designsystem:compileDebugKotlinAndroid
Task :designsystem:compileDebugJavaWithJavac NO-SOURCE
Task :designsystem:bundleLibRuntimeToJarDebug
Task :designsystem:bundleLibCompileToJarDebug
Task :designsystem:processDebugJavaRes
Task :designsystem:compileDebugUnitTestKotlinAndroid
Task :designsystem:compileDebugUnitTestJavaWithJavac NO-SOURCE
Task :designsystem:processDebugUnitTestJavaRes

Task :designsystem:testDebugUnitTest

org.hisp.dhis.mobile.ui.designsystem.ButtonSnapshotTest > launchButtonSnapshot FAILED
java.lang.NullPointerException at ButtonSnapshotTest.kt:27

11 tests completed, 1 failed

FAILURE: Build failed with an exception.

• What went wrong:
  Execution failed for task ':designsystem:testDebugUnitTest'.

There were failing tests. See the report at: file:///home/runner/work/dhis2-mobile-ui/dhis2-mobile-ui/designsystem/build/reports/tests/testDebugUnitTest/index.html

Task :designsystem:testDebugUnitTest FAILED

For more on this, please refer to https://docs.gradle.org/[8](https://github.com/dhis2/dhis2-mobile-ui/actions/runs/9003227033/job/24733378036#step:7:9).2.1/userguide/command_line_interface.html#sec:command_line_warnings in the Gradle documentation.
27 actionable tasks: 17 executed, 10 up-to-date

BUILD FAILED in 1m 17s
Error: Process completed with exit code 1.

In the PR you can see the line of code that is failing but it is simply the initialization of the test

Thanks in advance!

[TWiStErRob]

Did you forget the link @xavimolloy? Also do you have the full stack, that would probably help in diagnostics.

[xavimolloy]

Hi @TWiStErRob , I most certainly did forget to post the link! apologies for that. I hadn't posted the stacktrace as the message is not very helpful similarly to this closed issue even after accessing the report I didn't get much more info that the NPE ate mentioned problem line.
Sorry for the late reply, based in Spain here.

I have updated the initial description with links to the PR failed actions and other details.