GOODBOY008 commented on issue #717:
URL: https://github.com/apache/fesod/issues/717#issuecomment-4295271653

   ## Implementation Update: All Phases Complete in PR #901
   
   PR [#901](https://github.com/apache/fesod/pull/901) delivers the **full 
scope** of this proposal — all 6 phases — in a single branch 
(`test/717-1-testkit-foundation`).
   
   ---
   
   ### Migration Status (Final)
   
   | Phase | Scope | Status |
   |---|---|---|
   | Phase 1 | Testkit Infrastructure | ✅ Complete |
   | Phase 2 | converter/, core/, format/, readwrite/, sheet/ | ✅ Complete |
   | Phase 3 | fill/, style/, head/ | ✅ Complete |
   | Phase 4 | template/, annotation/ | ✅ Complete |
   | Phase 5 | Remaining packages (compatibility/, csv/, data/, large/, 
handler/) | ✅ Complete |
   | Phase 6 | Legacy cleanup (delete old packages) | ✅ Complete (51 files 
deleted) |
   
   ---
   
   ### What Was Delivered
   
   #### Phase 1 — Testkit Infrastructure
   
   New `testkit/` package with all 6 components + their own unit tests:
   
   ```
   testkit/
   ├── base/AbstractExcelTest.java          # @TempDir, format providers, 
round-trip helpers
   ├── enums/ExcelFormat.java               # XLSX/XLS/CSV with capability 
metadata + ExcelTypeEnum bridge
   ├── enums/ApiMode.java                   # FILE / STREAM
   ├── listeners/CollectingReadListener.java # Generic data collector — no 
embedded assertions
   ├── assertions/{ExcelAssertions, WorkbookAssert, SheetAssert, RowAssert, 
CellAssert}.java
   ├── helpers/RoundTripHelper.java         # write→read helpers for File and 
Stream API modes
   ├── builders/TestDataBuilder.java        # shared factory methods replacing 
per-class data()
   └── models/{SimpleData, ConverterBaseData, TitleData}.java
   ```
   
   #### Phases 2–5 — Package Reorganization
   
   All 35 legacy packages from `main` are accounted for. Migrated into 9 
organized packages:
   
   | New Package | Migrated From | Test Classes |
   |---|---|---|
   | `converter/` | converter/, celldata/, excludeorinclude/, extra/, sort/ | 7 
|
   | `core/` | simple/, nomodel/, repetition/, skip/, noncamel/ | 6 |
   | `format/` | bom/, charset/, csv/, compatibility/, dataformat/ | 6 |
   | `readwrite/` | encrypt/, exception/, cache/, parameter/, large/, 
writesheet/ | 8 |
   | `sheet/` | hiddensheets/, multiplesheets/ | 3 |
   | `style/` | style/, fill/, fill/style/, annotation/ | 8 |
   | `template/` | template/ | 1 |
   | `handler/` | handler/ | 1 |
   | `head/` | head/ | 6 |
   
   #### Phase 6 — Legacy Cleanup
   
   - **51 legacy files deleted** (old packages, listeners, duplicate model 
classes)
   - **26 assertion-bearing listener classes removed** — replaced by single 
`CollectingReadListener`
   - All `@TestMethodOrder` + `t01`/`t02`/`t03` naming conventions eliminated 
in migrated classes
   - `TestFileUtil.createNewFile()` classpath pollution replaced by `@TempDir`
   - 5 behavioral listeners retained in `readwrite/` — these are **not** the 
same anti-pattern (none embed `Assertions.*`); they serve specialized roles 
(exception-throwing, date windowing, large-batch collection)
   
   ---
   
   ### Final Metrics
   
   | Metric | Before (main) | After (PR #901) | Change |
   |---|---|---|---|
   | Packages | 35 legacy | 9 organized | -74% |
   | Listener classes with embedded assertions | 26 | 0 | -100% |
   | Per-format test method copies (t01/t02/t03) | 54+ | 0 | -100% |
   | Files deleted (legacy cleanup) | — | 51 | — |
   | Test files added/new | — | 70 | — |
   | Lines deleted | — | 6,960 | — |
   | Lines added | — | 5,901 | — |


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