Firelink/src-tauri/tests

Headless Download Engine Tests

Run the full Rust suite:

cd src-tauri
cargo test --all-targets

Run only the async download integration harness with deterministic serial performance measurements and visible test output:

cd src-tauri
RUST_BACKTRACE=1 cargo test --test download_engine -- --test-threads=1 --nocapture

The harness binds an ephemeral loopback port and requires no GUI, external network access, or bundled media binaries. It validates:

• aggregation of many streamed HTTP body chunks;
• pause and ranged resume through DownloadCoordinator;
• cancellation and partial-file cleanup;
• SHA-256 integrity after resume;
• retry recovery from transient HTTP failures;
• terminal error reporting after the retry budget is exhausted;
• a five-second local transfer performance budget for a 3 MiB fixture.