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test(progress): assert net-zero live-reporter leak, not process-global zero

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The signal-handler test asserted __liveReporterCountForTest() === 0 — a
process-global absolute that any earlier test file in the same bun shard
can poison (a production path that skips finish() on an error branch
leaves one live entry behind). Shard-5 LPT packing started co-locating
such a file before progress.test.ts, failing this test deterministically
on CI across unrelated PRs while master stayed green by packing luck.

Snapshot the count before the 50 lifecycles and assert no NET leak —
the same prior-state tolerance the handler assertion already applies
via installedBefore. The test still catches its own regression class
(any leak from these lifecycles shows up as delta >= 1).

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
This commit is contained in:
Garry Tan
2026-07-22 11:22:40 -07:00
co-authored by Claude Fable 5
parent 5f123c1404
commit ee095f1ca2
1 changed files with 8 additions and 2 deletions
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test/progress.test.ts
+8 -2
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@@ -218,15 +218,21 @@ describe('progress reporter', () => {
test('only one process-level signal handler installed across many reporters', () => {
// Baseline: one handler already installed by prior tests in this file.
const installedBefore = __signalHandlerInstalledForTest();
// liveReporters is process-global: earlier test files in the same shard
// can leave a live entry behind (e.g. a production path that skips
// finish() on an error branch). Assert NET-zero leak from THIS test's
// lifecycles, not an absolute zero we don't control — same tolerance
// the handler assertion below already applies via `installedBefore`.
const liveBefore = __liveReporterCountForTest();
const { stream } = sink(false);
for (let i = 0; i < 50; i++) {
const p = createProgress({ mode: 'json', stream, minIntervalMs: 0, minItems: 1 });
p.start(`phase_${i}`, 1);
p.finish();
}
// After 50 reporter lifecycles, still exactly one handler and zero leaked live entries.
// After 50 reporter lifecycles, still exactly one handler and zero NEWLY leaked live entries.
expect(__signalHandlerInstalledForTest()).toBe(installedBefore || true);
expect(__liveReporterCountForTest()).toBe(0);
expect(__liveReporterCountForTest()).toBe(liveBefore);
});
test('startHeartbeat() fires heartbeats and stop() clears', async () => {