130

[RAprogramm]

Summary

Integrate wasmcov for comprehensive WASM code coverage analysis, resolving the long-standing limitation of measuring coverage only for native-testable code.

Changes

Dependencies

• Add wasmcov = "0.2" to dev-dependencies for WASM coverage instrumentation

Library Code

• Implement capture_coverage() FFI function for wasmcov integration (src/lib.rs:35)
• Function is only exported for wasm32 targets during test builds
• Proper error handling with console logging for coverage capture failures

CI Infrastructure

• Add dedicated wasm-coverage job with nightly Rust toolchain
• Configure wasm32-unknown-unknown target and llvm-tools-preview
• Install and execute cargo-wasmcov for WASM test coverage
• Generate LCOV reports and upload to Codecov with wasm flag

Coverage Configuration

• Configure Codecov flags for separate native and WASM coverage tracking
• Remove WASM-only modules from ignore list (leptos, yew, api, webapp, logger, pages, router)
• Enable coverage carryforward for both native and WASM reports

Documentation

• Update README to reflect comprehensive coverage capabilities
• Replace coverage limitations warning with comprehensive coverage note
• Link to implementation details in issue Integrate wasmcov for WASM code coverage #130

Maintenance

• Add /wasmcov to .gitignore for build artifacts
• Add wasmcov/** to REUSE.toml for license compliance

Technical Details

wasmcov is a specialized coverage tool developed by Hacken for WebAssembly executables. It:

• Uses LLVM instrumentation for professional-grade coverage analysis
• Requires nightly Rust toolchain
• Runs tests with --test-threads=1 to avoid environment conflicts
• Generates LCOV-compatible reports for Codecov integration

Testing

All pre-commit checks passed:

• ✅ Formatting (cargo +nightly fmt)
• ✅ Linting (cargo clippy)
• ✅ Tests (197 tests: 26 unit + 4 integration + 167 doctests)
• ✅ License compliance (reuse lint)

Expected Impact

• Coverage metrics will now include WASM-only code
• True project coverage should reach 95%+ target
• Better visibility into code quality across entire codebase

Closes #130
Closes #128

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ All tests successful. No failed tests found.

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