feat: alttester automation test support

[mihakrajnc]

Pull Request Description

Adds AltTester SDK integration for UI automation testing, along with a standalone .NET test project, CI instrumented build support, and a Claude AI sub-agent + required documentation.

What does this PR change?

AltTester SDK Integration

• Adds the AltTester Unity package and prefab to the project
• Non-release builds (PR and dev) include AltTester instrumentation, activated at runtime via the --alttester launch argument
• Adds the alttester flag to AppArgsFlags so the instrumentation is opt-in

Standalone Test Project (ExplorerAutomationTests/)

• .NET 8.0 project using AltTester-Driver 2.3.0, NUnit 3, and Allure reporting
• Page Object Model (POM) architecture:
  • BaseView — abstract base with click, wait, find, text helpers and Allure step tracking
  • BaseTest — driver lifecycle, view initialization, EnsureInWorld() flow (splash → auth → loading)
  • BaseSection — abstract base for panel sections with visibility/wait helpers
  • Screen views: AuthenticationMainScreenView, SplashView, LoadingScreenView, MainMenuView, ExplorePanelView
  • Explore Panel sections: EventsSection, PlacesSection, CommunitiesSection, NavmapSection, BackpackSection, GallerySection, SettingsSection
  • Reporter — timestamped logging and Allure screenshot/attachment helpers
• 15 tests covering sidebar navigation, keyboard shortcuts, and tab switching for the Explore Panel

Documentation

• Adds docs/automation-testing.md with architecture overview, manual and MetaForge test instructions, and AltTester AI Extension setup for Claude Code
• Adds README.md and CODING_STANDARDS.md to the test project
• Adds automation-tester Claude Code sub-agent (.claude/agents/) for AI-assisted test authoring

Test Instructions

Prerequisites

• AltTester Desktop installed (Pro license required)
• .NET 8.0 SDK installed
• An instrumented Explorer build from this PR, or the Unity Editor
• MetaForge installed and updated to latest dev release (metaforge update --dev)

Test Steps — Manual

1. Download the instrumented build from the PR artifacts
2. Launch it with --alttester
3. Open AltTester Desktop and confirm Explorer connects
4. Run the tests:

   cd ExplorerAutomationTests
   dotnet test

5. All 15 tests should pass (explore panel sidebar, shortcuts, tab switching)

Test Steps — MetaForge

1. metaforge explorer test 7645
2. All tests should pass and an Allure report should open in the browser

Additional Testing Notes

• Verify that the --alttester flag is required — without it, the AltTester prefab should not load
• Verify that release builds do NOT include AltTester instrumentation
• The AltTester connection overlay should be visible in the instrumented build

Quality Checklist

• Changes have been tested locally
• Documentation has been updated
• Performance impact has been considered (AltTester is opt-in and excluded from release builds)

Code Review Reference

Please review our Code Review Standards before submitting.

[github-actions]

Windows and Mac build successful in Unity Cloud! You can find a link to the downloadable artifact below.

Name	Link
Commit	c284e62
Logs	https://github.com/decentraland/unity-explorer/actions/runs/23439836148
Download Windows	https://github.com/decentraland/unity-explorer/suites/61636923383/artifacts/6060173071
Download Windows S3	https://explorer-artifacts.decentraland.org/@dcl/unity-explorer/branch/feat/alttester/pr-20089-c284e62/Decentraland_windows64.zip
Download Mac	https://github.com/decentraland/unity-explorer/suites/61636923383/artifacts/6059911814
Download Mac S3	https://explorer-artifacts.decentraland.org/@dcl/unity-explorer/branch/feat/alttester/pr-20089-c284e62/Decentraland_macos.zip
Built on	2026-03-23T14:05:52Z

[pravusjif]

All the changes in this prefab are the AltId Monobehaviour addition on inner UI GameObjects right?

[pravusjif]

Are these 2 files needed?