The four tests polled the async task pool with a fixed budget of five
app.update() calls. Under cargo test --workspace the pool's background
threads are starved by other tests, so even an instantly-resolving future
can take more than five frames to be polled. Replace the fixed loop with a
deadline-bounded loop (5 s timeout) that exits early once the expected
side-effect is observable — the same pattern used in sync_plugin.rs tests.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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