# Phase 8: Validation Plan

**Phase:** 08-pagination-quality-cache-performance
**Created:** 2026-05-23

## Verification Strategy

This phase has no unit test target for EPUBTextRendering. Verification is build-only plus manual visual inspection.

### Automated Verification

| Check | Command | Frequency |
|-------|---------|-----------|
| Build succeeds | `xcodebuild build -project ReadViewDemo/ReadViewDemo.xcodeproj -scheme ReadViewDemo -destination 'platform=iOS Simulator,name=iPhone 16'` | Per task commit |

### Manual Verification (Phase Gate)

| Requirement | What to Check | How |
|-------------|---------------|-----|
| QUAL-01 | Same chapter does not re-typeset on repeat navigation | Navigate to a chapter, back, then forward again — second visit should be noticeably faster (check `[EPUB][Perf]` log for elapsed time) |
| QUAL-02 | Images don't overflow pages | Open 宝山辽墓材料与释读, navigate to Chapter 5 (qrbodyPic images), verify no height overflow |
| QUAL-03 | Image sizing rules are verifiable | Code review: `DTMaxImageSize` = 1080x1920, unified max-size block in `prepareHTMLElementForReaderRendering` |
| QUAL-04 | No perf degradation | Check `[EPUB][Perf]` log output — pagination times should be comparable to pre-change baseline |

### Image Display Checklist

- [ ] Cover image: displays correctly, not cropped, not stretched
- [ ] qrbodyPic images: display within page bounds, no height overflow
- [ ] Footnote images: inline with text, same height as text characters, width-only sizing
- [ ] Dark mode: all image types still display correctly
- [ ] Page breaks around images: no orphan images at page tops/bottoms

## Rationale

Build-only verification is the appropriate approach for this phase because:
1. No unit test target exists for EPUBTextRendering code
2. Image sizing correctness is inherently visual — pixel-level assertions would be brittle
3. The changes are surgical (one new code block, removals of redundant logic) and can be verified by code review + visual inspection
4. Creating a test infrastructure is out of scope (belongs to Phase 9: 自动化回归与证据标准化)