test: run the worker integration tests in their own job, as two real tests

[alongubkin]

Problem

alien-local::worker_integration set the Rust crates job's wall clock. On main today it takes 607 test-seconds of a 607 s test run.

• The first test built the bindings addon in release mode (napi build --release, ~5 min), and the other tests waited on its lock.
• Then 8 tests each ran alien build of examples/basic-worker-ts again, one at a time.

In 60 days its failures were all readiness timeouts, install errors or build races it caused itself. None was a product bug.

Change

• New path-filtered Worker integration job in ci-fast.yml, in parallel with Rust crates.
  • It builds the addon (cargo build -p alien-bindings-node --lib, debug, staged as alien-bindings-node.linux-arm64-gnu.node) and the AI gateway once.
  • Then it runs cargo nextest run -p alien-local --test worker_integration.
  • It runs when the local runtime, build toolchain, bindings, worker runtime, packages, the example app or the root/examples pnpm files change, and on manual runs.
  • It's added to All tests passed.
• The main Rust job filters the binary out, so it still compiles there.
• Its tests share a nextest test group with max-threads = 1: two alien build runs in the same example directory could delete each other's generated files.
• The 8 build-heavy tests become 2:
  • worker_lifecycle_on_one_image checks:
    • a never-started worker is unhealthy
    • start, then a second start returns the same URL
    • the Local binding URL equals the worker URL
    • /health returns ok with a timestamp, and the health check passes
    • after stop, the worker isn't running and isn't healthy
    • it restarts and serves again
    • delete removes the extracted dir and the URL
  • two_workers_from_one_image_run_side_by_side: two workers from one image start at the same time, get distinct ports, and both serve /health. Both run the same Bun-compiled binary, so this also covers processes sharing its embedded addon.
• Removed:
  • test_delete_prevents_port_reuse: it asserted two random ports differ, so it can fail on correct code.
  • test_port_allocation_fallback: it only printed which port it got.
• A missing bun now fails the tests instead of skipping them.

Verified locally (macOS, addon prebuilt)

cargo nextest run -p alien-local --test worker_integration: 5 passed in 61 s.

🤖 Generated with Claude Code

[greptile-apps]

Confidence Score: 5/5

[Medium risk] Reorganizes test execution and CI filtering for worker tests.

The PR appears safe to merge; no outstanding finding or new actionable issue remains.

Summary

The PR moves worker integration tests into a path-filtered CI job and consolidates the build-heavy tests.

• The new nextest group serializes the tests that build from the shared example directory.
• Both previous findings are addressed: the builds are serialized, and the worker-job filter includes the previously missing dependency files.

_{Reviews (2) · Last reviewed commit: "test: serialize the worker builds and ru..."}

[alongubkin]

@greptileai review