axum-test-transport

Use this skill when working on Axum tests that currently start a server or could be simplified.

Prefer oneshot when the test only verifies:

• status codes
• headers
• JSON/body shape
• route or middleware behavior
• request handling without real network behavior

Use:

use tower::ServiceExt;

oneshot is available through tower::ServiceExt.

Keep a real TcpListener + axum::serve(...) when the test needs:

• WebSocket upgrade/handshake behavior
• real client behavior (reqwest, tokio_tungstenite, etc.) as the thing under test
• transport/lifecycle concerns like bind/listen/shutdown
• true end-to-end coverage over http:// or ws://

Repository guidance:

• crates/transcribe-cactus/tests/batch.rs style tests are good oneshot candidates
• crates/transcribe-cactus/tests/live.rs WebSocket tests should stay real-server
• if several tests share the same in-process request setup, add a tiny local helper (for example request builder or response JSON parser)

After changes:

• run pnpm exec dprint fmt
• run the relevant Rust test compile/check command