test(realtime): expect session.created as xAI realtime initial event

[yuneng-berri]

Summary

The xAI realtime E2E test (tests/llm_translation/realtime/test_xai_realtime.py) failed in CI with:

AssertionError: Expected conversation.created, got session.created

xAI's Grok Voice Agent API now sends session.created as its first realtime event (matching OpenAI's protocol), followed by conversation.created. The test is a canary that pinned the old conversation.created value, so it correctly caught the upstream change.

This is not a LiteLLM-side regression. The xAI realtime path is a verbatim passthrough — get_provider_realtime_config() returns None for xai, so RealTimeStreaming runs the raw forwarding path and emits xAI's bytes unchanged. No code path rewrites the event type. The fix is simply to update the pinned expected value to match xAI's current behavior.

Changes

• test_xai_realtime.py: get_initial_event_type() now returns session.created; docstring updated.
• base_realtime_tests.py: corrected a stale comment.

Test plan

• pytest tests/llm_translation/realtime/test_xai_realtime.py — all 4 tests pass, including the live test_realtime_connection against xAI's production API (API RESPONSE #1 - Event: session.created → PASSED).

[greptile-apps]

Greptile Summary

Updates the xAI realtime E2E test to reflect xAI's upstream API change: their Grok Voice Agent now sends session.created as its first realtime event (matching OpenAI's protocol) rather than conversation.created. No LiteLLM logic is modified — the xAI path is a verbatim passthrough, so this is purely a test expectation correction.

• test_xai_realtime.py: get_initial_event_type() updated from \"conversation.created\" to \"session.created\"; class docstring refreshed accordingly.
• base_realtime_tests.py: Inline comment on _is_initial_event() corrected to say both OpenAI and xAI now use \"session.created\"; no logic change.

Confidence Score: 5/5

Safe to merge — two-line change updating a pinned expected value to match an upstream API behavior change, with no LiteLLM logic touched.

Both changed files are test-only. The xAI realtime path is a verbatim passthrough in LiteLLM (get_provider_realtime_config returns None for xai), so the only thing that needed updating was the expected first-event type in the test assertion. The base class helper already accepted both values, making this a safe and self-contained correction.

No files require special attention.

Important Files Changed

Filename	Overview
tests/llm_translation/realtime/test_xai_realtime.py	Updates get_initial_event_type() from "conversation.created" to "session.created" and refreshes the class docstring to reflect xAI's current protocol behavior
tests/llm_translation/realtime/base_realtime_tests.py	Stale inline comment corrected; no logic changes — _is_initial_event() already accepted both "session.created" and "conversation.created"

_{Reviews (1): Last reviewed commit: "test(realtime): expect session.created a..." | Re-trigger Greptile}

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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