Reorganized test suite with consolidated benchmarks and comprehensive
edge case coverage, exceeding 95% minimum coverage requirement.
Changes:
- Created benchmark_test.go with all 52 benchmarks organized by category
(arithmetic, clock, date, diff, format, inspection, parse, snap, unit)
- Removed benchmarks from 9 individual test files for better organization
- Added 6 edge case tests to improve coverage:
* Format() unknown type fallback
* formatLong() empty lang default
* Format.String() unknown value
* isYearPrefix() edge cases
* StartOf()/EndOf() unsupported units
- Added 3 DST transition tests:
* Spring forward (23-hour day)
* Fall back (25-hour day)
* Multiple timezone preservation
Results:
- Test coverage: 97.7% → 99.5% (exceeds 95% target)
- All 52 benchmarks consolidated and verified
- All benchmarks meet performance targets
- No test regressions
Files modified:
- Created: benchmark_test.go (580 lines)
- Modified: 9 test files (removed benchmarks, added tests)
