- Add PHPUnit 9.6 as dev dependency
- Configure phpunit.xml for test suite
- Add bootstrap.php for test initialization

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Co-Authored-By: Claude <noreply@anthropic.com>

Test coverage for:
- h() / h_decode(): HTML escaping and decoding
- is_image(): Image file detection
- get_mimetype(): MIME type detection
- wrap_script_tag(): JavaScript wrapping
- is_url(): URL validation with protocol options
- wikiescape(): Dangerous wiki tag escaping
- get_bs_style(): Bootstrap class generation

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Co-Authored-By: Claude <noreply@anthropic.com>

- Run PHPUnit tests on PHP 7.3 and 7.4
- Trigger on push to master/feature/* and PRs to master
- Cache Composer dependencies for faster builds

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Co-Authored-By: Claude <noreply@anthropic.com>

- Use PHP 7.4 only (matches composer.lock)
- Run on push to master and PRs only (avoid duplicate runs)

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Co-Authored-By: Claude <noreply@anthropic.com>

Migrating to GitHub Actions for CI/CD.

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Co-Authored-By: Claude <noreply@anthropic.com>

- Trigger on version tags (v*)
- Run tests before release
- Build update package (excluding dev files and user data)
- Create GitHub Release with update zip

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

Test coverage for:
- Singleton pattern (get_instance)
- Value storage (setv/getv, setv_once)
- Value manipulation (appendv, prependv)
- One-time operations (appendv_once, prependv_once)
- Template syntax conversion (convert_php)

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

- Add 28 tests for plugin/button.inc.php covering:
  - Button types (primary, danger, success, warning, info, link)
  - Button sizes (large, small, mini, xs)
  - Button styles (block, round, gradient, ghost)
  - URL and page link handling with is_page() integration
  - XSS protection for href and target attributes
- Update bootstrap.php with DATA_DIR and global variables
  ($BracketName, $InterWikiName) required for is_pagename()

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Co-Authored-By: Claude <noreply@anthropic.com>

Ignore test data directory used for temporary wiki pages during testing.

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Co-Authored-By: Claude <noreply@anthropic.com>

Each test file now includes a header comment specifying:
- The target file being tested
- The functions/classes covered by @Covers annotation

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Co-Authored-By: Claude <noreply@anthropic.com>

- Add error_reporting(E_ALL) to bootstrap.php to show all PHP notices
- Configure phpunit.xml to not convert notices/warnings/deprecations to exceptions
- Keeps tests passing while making PHP issues visible in output

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Co-Authored-By: Claude <noreply@anthropic.com>

- Define CACHE_DIR once in bootstrap.php to avoid duplicate definition
- Remove CACHE_DIR definitions from individual test files
- Add defined() checks for CONTENT_CHARSET and TEMPLATE_ENCODE

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

Test QHM-specific extension of PukiWiki's ruby plugin:
- Error message retrieval via get_qm() message system

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Co-Authored-By: Claude <noreply@anthropic.com>