Phase 7: Unit Test Creation
Created comprehensive unit tests in log_buffer_flush_gap_test.go:
- TestFlushOffsetGap_ReproduceDataLoss: Tests for gaps between disk and memory
- TestFlushOffsetGap_CheckPrevBuffers: Tests if data stuck in prevBuffers
- TestFlushOffsetGap_ConcurrentWriteAndFlush: Tests race conditions
- TestFlushOffsetGap_ForceFlushAdvancesBuffer: Tests offset advancement
Initial Findings:
- Tests run but don't reproduce exact production scenario
- Reason: AddToBuffer doesn't auto-assign offsets (stays at 0)
- In production: messages come with pre-assigned offsets from MQ broker
- Need to use AddLogEntryToBuffer with explicit offsets instead
Test Structure:
- Flush callback captures minOffset, maxOffset, buffer contents
- Parse flushed buffers to extract actual messages
- Compare flushed offsets vs in-memory offsets
- Detect gaps, overlaps, and missing data
Next: Enhance tests to use explicit offset assignment to match production scenario
