add returnOffset functional test

[cotid-qualabs]

No description provided.

[gemini-code-assist]

Summary of Changes

Hello @cotid-qualabs, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request introduces a new functional test to ensure the correct behavior of the returnOffset feature within Alternative MPD events. This enhancement verifies that when an alternative content segment concludes, the player accurately returns to the main content stream at the time specified by the returnOffset property, improving the robustness of live stream handling with alternative content.

Highlights

• New Functional Test: A new functional test has been added to validate the returnOffset functionality for Alternative MPD events, specifically for live-to-live transitions.
• Test Configuration Update: The alternative-mpd.json test configuration file has been updated to include the newly added returnOffset functional test.

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[gemini-code-assist]

Code Review

This pull request adds a new functional test for the returnOffset feature in Alternative MPD scenarios, including test configuration and implementation. The new test is well-structured, but I have a few suggestions for improvement. There's a potential race condition in how playback time is checked after switching content, which could be fixed by sampling the time after a delay. Additionally, a small piece of logic for array initialization can be simplified for better readability. I also noticed a minor typo in the pull request title ('funcional' should be 'functional'). Overall, this is a valuable addition for test coverage.