🧪 [Testing Improvement] Add tests for invalidateCapturedCheckpointPositions

[google-labs-jules]

🎯 What: The internal invalidateCapturedCheckpointPositions method in ModificationTracker (inside src/core/undo-history.ts) was previously untested. This method is crucial for ensuring that previously captured checkpoint positions are marked unsafe after undo, rollback, or memory eviction operations.

📊 Coverage: Added new unit tests to tests/unit/undo-history.test.ts to verify the state changes driven by this internal logic through the tracker's public API. The newly covered scenarios include:

• Timeline eviction enforcing memory limits.
• Stepping backward (undo).
• Rolling back to a checkpoint with undone entries on the redo stack.
• Rolling back to a checkpoint with uncommitted entries.
• Verifying that rollback causes no invalidation when there are no changes to revert.

✨ Result: Enhanced test coverage and reliability for undo/redo checkpoint tracking logic, ensuring that state invalidations occur properly under complex branch/rollback conditions.

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PR created automatically by Jules for task 11789906827525856730 started by @zknpr

[google-labs-jules]

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Project	Deployment	Actions	Updated (UTC)
sq-lite-explorer	Ready	Preview, Comment	Jun 8, 2026 4:37pm