给所有的 Rust 插件添加单元测试 / Add unit tests to all Rust plugins

[Copilot]

Summary

This PR adds comprehensive unit tests to all 10 Rust plugins that were previously missing test coverage, bringing the repository to 100% plugin test coverage.

Changes

Added unit tests to the following plugins:

• compress: Tests for compression algorithms, default configurations, and options deserialization
• dsv: Tests for CSV/TSV parsing, file type detection, and plugin configuration
• image: Tests for image processing options, DOM mode, and filter configuration
• mdx: Tests for MDX file detection, JSX runtime options, and plugin initialization
• modular-import: Tests for plugin name and options deserialization
• strip: Tests for code stripping patterns, regex creation, and AST manipulation
• url: Tests for URL handling, file operations, and asset configuration
• wasm: Tests for WASM helper constants and plugin initialization
• worker: Tests for Web Worker patterns, regex matching, and worker configuration
• yaml: Tests for YAML file detection, document parsing, and JavaScript conversion

Testing Approach

All tests follow the existing patterns established by plugins like virtual, auto-import, and react-components:

• Tests are placed in #[cfg(test)] modules at the end of each lib.rs file
• Focus on core functionality: plugin creation, configuration parsing, and key utility functions
• Use simple assertions with mock data for easy maintenance
• All 42 new tests pass successfully

Test Coverage

Before this PR:

• 5 plugins with tests (auto-import, icons, react-components, svgr, virtual)
• 10 plugins without tests

After this PR:

• 15 plugins with tests ✅
• 0 plugins without tests ✅

Statistics

• 10 files modified
• 435 lines of test code added
• 42 new tests passing
• 0 breaking changes

All tests can be run with cargo test --workspace --lib

Original prompt

给所有的 rust 插件添加单元测试

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