- 7 strip_html tests: remove tags, collapse whitespace, nested tags, self-closing tags, attributes, empty input, plain text - 4 extract_epub_chapter_texts tests: chapters with HTML, empty chapter filtered, all empty, plain text preserved - epub_with_chapter_text helper builds EPUB with custom chapter content Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>