[TEST] #62: CoverageTrack with RLE compression

[crashfrog]

Summary

Comprehensive test suite for CoverageTrack RLE (run-length encoding) compression with quantization to nearest 5. Tests cover all acceptance criteria from issue #62.

Test Coverage

Unit Tests (14):

• Uniform coverage - single RLE run compression
• Alternating coverage - many RLE runs
• Zero coverage regions preservation
• Quantization to nearest 5 (0, 5, 10, 15, ...)
• Random access via binary search O(log n)
• Out-of-bounds access handling
• Iterator over (position, coverage) pairs
• Empty coverage edge case
• Single position edge case
• Realistic bacterial genome (4.6Mbp with coverage variation)
• High depth sequencing (100x coverage)
• Serialization/deserialization round-trip

Property Tests (5):

• Round-trip: encode → decode equals original (modulo quantization)
• Quantization idempotence: quantize(quantize(x)) == quantize(x)
• Random access consistency: coverage_at(i) == to_vec()[i]
• Quantization invariant: all values are multiples of 5
• Quantization accuracy: quantized value within ±2 of original

Benchmarks:

• Compression ratio on uniform, realistic, high-variation, and random coverage patterns
• Random access performance (binary search)
• Full decompression performance

Test Status

All tests FAIL as expected (RED phase). Implementation stub uses unimplemented!() to ensure tests compile but fail at runtime.

Test Results

running 14 tests
test result: FAILED. 0 passed; 14 failed; 0 ignored; 0 measured

Property tests also failing with proptest framework correctly exercising the API.

Test plan

• All unit tests compile
• All property tests compile
• All benchmarks compile
• All tests fail with unimplemented! (RED phase verified)
• Code formatted with cargo fmt
• Clippy passes with no warnings
• Tests cover all acceptance criteria from CoverageTrack with RLE compression #62

Generated with Claude Code

[crashfrog]

Closing stale PR. Work has been superseded or merged via alternative approach.