[Gradle] Add integration tests for KMP test execution, aggregation, and failure reporting

[Yermukhamed Shakhman (ermawqa-jetbrains)]

Summary

• Added dedicated, lightweight integration tests covering KMP test aggregation (:allTests) and test failure reporting fidelity (:jvmTest)

Changes

MppTestReportIT.kt:

• Added testAllTestsReportAggregation: Verifies :allTests execution across multiple targets (jvm + js(Node)), aggregate HTML report generation (build/reports/tests/allTests/index.html), and XML test case verification.
• Added testTestFailureReportingAndStackTrace: Verifies :jvmTest failure handling, structured XML metadata (failure.type, failure.message), anti-drift dynamic line number resolution in stack traces, and target HTML report generation.

testAssertions.kt:

• Normalized test class name parsing in readTestCases to handle Gradle 9+ non-JVM task name prefixes.

^KQA-3437

[kodee-bot]

Hi! It looks like there are no references to any YT issues in the commit messages.
If the change is non-functional, feel free to ignore the comment :)
Otherwise, please add them as requested in the guideline.

[kotlin-safemerge]

Code Owners

Rule	Owners	Approval
/​libraries/​tools/​kotlin-​gradle-​plugin-​integration-​tests/​	kotlin-build-tools AYastrebov Egorand Tapchicoma antohaby 🌴 Herudaio atyrin (QA) timofeys1 🌴 nav-nav CherepanovAleksei rbbozkurt 🌴 shinkai-tester (QA) 🌴 viakunin levchenkoin (QA) adam-enko ermawqa-jetbrains	✅ Egorand 🔒

PR commands for maintainers

Command	Description	Parameters
/safe-merge	Rebase-merges with automatic fixup commit squashing	--fixup Autosquash fixup commits (on by default)
/safe-squash-merge	Squash-merges with optional commit title/body override	--title Title of the squashed commit --message Body of the squashed commit
/dry-run	Runs the test pipeline with changes rebased on latest master	--retry Retry the CI run on failure
/test-public	Triggers the public test suite without rebasing on latest master	—
/test-private	Triggers the private test suite without rebasing on latest master	—
/codeowners	Triggers code owners check and comment update	—
/fixup	Squashes fixup commits and force pushes the branch	—
/cancel-coordinator	Cancels the merge coordinator currently running for this branch	—

[Yermukhamed Shakhman (ermawqa-jetbrains)]

Andrey Tyrin (@atyrin) Egor Andreevich (@Egorand) could this test suite be candidate for smoke tests? Personally I couldn't think of cases when this "feature" can be affected by another domains. However, LLM thinks that there are cases when tests can easily be broken by Compiler/Libraries/Js/Wasm domains.

[Egor Andreevich (Egorand)]

Looks good!

/final

[Egor Andreevich (Egorand)]

As an alternative I think we can consider testing against a golden file here, I think this approach might be less brittle against potential HTML report formatting changes in future versions of Gradle.