Improve tests

[marcodejongh]

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Project	Deployment	Review	Updated (UTC)
boardsesh	Ready	Preview, Comment	Jan 1, 2026 0:56am

[claude]

Claude Review

No significant issues found.

This PR improves test quality by:

• Adding proper registerAndJoinSession and registerClients helpers that register clients before joining sessions (matching actual API requirements)
• Adding explanatory comments about mock Redis limitations
• Simplifying tests that were over-relying on mock Redis behavior that did not match production

Minor observations (informational, not blocking):

• Some tests now verify weaker assertions (e.g., toBeGreaterThanOrEqual(1) instead of exact version increments) due to mock Redis limitations. Consider adding integration tests with real Redis for stricter verification if this behavior is critical.