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4grayandClaude Opus 5
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* test(playback): drive embedded MPV controller specs on a fake clock The `waitFor` helper in the three embedded-mpv-session-controller specs polled real timers against a `Date.now() + 1s` deadline. Under parallel Jest workers the controller's async startup chain (support load -> waitForStartupPaint -> session create -> update subscription) did not always settle inside that budget, so a different pair of tests failed on each run. Bound the drain loop by rounds on a fake clock instead of elapsed wall time, so machine load can no longer change the outcome. Each round advances 1ms rather than 0ms: `waitForStartupPaint` nests rAF inside rAF, and a zero-delay timer scheduled from inside a timer callback is clamped to the next millisecond, so a 0ms advance fires the outer hop and strands the inner one forever. Assertions and behavior under test are unchanged. Fake timers also stop the stalled tracker's 30s timeout leaking into the real timer queue, which removes the "worker process failed to exit gracefully" warning. Verified with 5x `nx test ui-playback --skip-nx-cache` and 5x the same suite at --maxWorkers=32 (the condition that reproduced the flake): 975/975 tests passing each time. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> * docs(playback): scope the fake-clock claim in the MPV controller spec The comment said machine load "no longer changes the outcome", which overclaims. Removing the spec's own `Date.now()` deadline means the spec imposes no budget of its own, but Jest's per-test timeout still measures wall time — at extreme worker oversubscription these specs can still hit it, as every spec can. Comment only; no behavior change. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> --------- Co-authored-by: Claude Opus 5 <noreply@anthropic.com>