Joseph Doherty
6952f686fa
perf: optimize ExcelIO tests with fixture-based consolidation
- Add WorkbookFixtureBase and 4 concrete fixtures for shared workbooks
- Add ExcelTestHelpers with shared utility methods
- Create Integration/ folder with 7 fixture-based test classes:
- MinimalSearchTests (5 tests)
- SearchResultsSheetTests (5 tests)
- MisInfoSheetTests (11 tests)
- InvestigationSheetTests (7 tests)
- ProtectionAndStyleTests (7 tests)
- LegacyFormatTests (5 tests)
- LargeDataSetTests (1 test)
- Delete redundant ExcelExportIntegrationTests.cs (26 tests)
- Delete redundant LegacyComparisonTests.cs (16 tests)
- Reduce workbook generations from ~42 to 4 fixtures
- Test runtime reduced from ~18 min to ~4 min (76% improvement)
- All 122 ExcelIO tests pass
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