🤖 Add integration tests for stream error recovery (no amnesia) #333
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- Add DEBUG_TRIGGER_STREAM_ERROR IPC channel for testing - Add debugTriggerStreamError method to StreamManager that: - Aborts active stream - Writes partial with accumulated parts and error metadata - Emits error event (same as real errors) - Add integration tests that verify context preservation: - Test 1: Single stream error + resume - Test 2: Three consecutive stream errors + resume - Tests use Haiku 4.5 for speed - Tests verify accumulated parts are preserved in partial.json - Tests verify resumed streams complete successfully with context Generated with `cmux`
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- Fix: After triggering debug error, update streamInfo.initialMetadata with error/errorType - This ensures subsequent flushPartialWrite() calls preserve the error metadata - Prevents cleanup code from overwriting error-marked partial with clean partial
- Remove direct filesystem access (partial.json reads) - Remove metadata structure verification - Use existing readChatHistory helper instead of custom implementation - Create user-focused helpers: waitForStreamWithContent, triggerStreamError, resumeAndWaitForSuccess - Verify behavioral outcomes (content delivered, topic-relevant) not internal state - Tests now read like user journeys instead of implementation checks - Add comprehensive documentation explaining test approach Makes tests resilient to refactoring - they verify the behavioral contract (no amnesia after stream errors) rather than implementation details. -18 lines, improved readability
Changed from essay/explanation tasks to counting 1-100 for more robust verification: - Extract and validate number sequences from responses - Verify sequence continuity proves context preservation - Check progress past error points to confirm no amnesia - Disable all tools via toolPolicy to ensure pure text responses Deterministic validation is less flaky than keyword matching and provides stronger proof that context was actually preserved through errors.
Changes: - Fixed counting task with descriptions for slower streaming - Adjusted validation to handle realistic model behavior (may restart count) - Removed flaky multi-error test (model completes too fast for multiple interruptions) - Single error test proves amnesia fix works correctly - Test now passes reliably in ~23s Validation now checks for substantial work (range, unique numbers) rather than perfect ascending sequence, which is more realistic for error recovery scenarios.
Replace the previous "substantial work" test with a more precise test that validates both prefix preservation and exact continuation after stream errors. Key improvements: - Use structured markers (nonce + line numbers) to detect exact continuation - Capture pre-error streamed text from stream-delta events (user-visible path) - Interrupt mid-stream after detecting stable prefix (≥10 complete markers) - Assert: (a) final text starts with exact pre-error prefix, (b) contains next sequential marker shortly after prefix - Fix event collection bug: properly track consumed deltas to avoid duplicates The test now directly proves both properties of "no amnesia" recovery: 1. Pre-error streamed content is preserved in history (prefix preservation) 2. Resumed stream continues from exact point (exact continuation) No internal storage coupling - uses only stream events and final history.
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Summary
Adds integration test to verify that stream error recovery preserves context (no amnesia bug).
Changes
DEBUG_TRIGGER_STREAM_ERRORIPC channeldebugTriggerStreamError()triggers artificial stream errors that follow the same code path as real errorsTest Design
Structured-marker approach for precise validation:
Test Flow:
${nonce}-<n>: <word>(e.g.ai7qcnc20g-1: one)Validation:
Why this approach:
Bug Fix
Also fixed event collection bug in
collectStreamUntil: properly track consumed deltas to avoid returning the same event multiple times. Previous logic returned first matching event on every poll, causing duplicate processing.Related
Follow-up to #331 which fixed the amnesia bug by preserving accumulated parts on error.
Test Results
✅ Test passes reliably in ~18-21 seconds
✅ Validates exact prefix preservation and continuation
✅ No flaky failures from timing issues
✅ Integration tests pass: 1 passed, 1 total
Generated with
cmux