- Add setUp() to seed test data: items, sales, sales_items, sales_items_taxes
- Add tearDown() to clean up seeded data after tests
- Remove skip conditions since we now have guaranteed test data
- Add testTaxDataIsGroupedByTaxNameAndPercent to verify grouping
- Use narrow date range to isolate seeded data
Tests now:
- Use DatabaseTestTrait for real database integration
- Actually call getData() and getSummaryData() methods
- Verify row totals (subtotal + tax = total) from real queries
- Verify summary data matches sum of rows
- Test getDataColumns() returns expected structure
- Use assertEqualsWithDelta for float comparisons with tolerance
These tests exercise the actual SQL queries and verify the
mathematical consistency of the calculations returned.
- Ensure total = subtotal + tax by deriving total from rounded components
- Use assertEqualsWithDelta for float comparisons in tests
- Add defensive null coalescing in calculateSummary helper
- Add missing 'count' key to test data rows
- Add testRoundingAtBoundary test case
