37 lines
1.4 KiB
TypeScript
37 lines
1.4 KiB
TypeScript
import { expect, test } from "bun:test";
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import { bunEnv, bunExe } from "harness";
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// https://github.com/oven-sh/bun/issues/32793
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// Date.now() is tagged DateNowIntrinsic, so a hot call site is inlined by the
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// DFG/FTL as a DateNow node. operationDateNow, its slow path, used to return
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// the wall clock and ignore JSGlobalObject::overridenDateNow, so a
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// setSystemTime() override silently wore off as soon as the call site tiered
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// up. The loop runs far past the tier-up point (the released build diverges
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// after ~10-20k iterations).
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test("setSystemTime() keeps overriding Date.now() after the call site is JIT compiled", async () => {
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await using proc = Bun.spawn({
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cmd: [
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bunExe(),
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"-e",
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`const { setSystemTime } = require("bun:test");
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const frozen = new Date("2024-01-09T00:00:00.000Z").getTime();
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setSystemTime(frozen);
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const readNow = () => Date.now();
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let divergedAt = -1;
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for (let i = 0; i < 500_000; i++) {
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if (readNow() !== frozen) { divergedAt = i; break; }
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}
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console.log(divergedAt);`,
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],
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env: bunEnv,
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stderr: "pipe",
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});
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const [stdout, stderr, exitCode] = await Promise.all([proc.stdout.text(), proc.stderr.text(), proc.exited]);
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if (exitCode !== 0) {
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expect(stderr).toBe("");
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}
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expect({ divergedAt: stdout.trim(), exitCode }).toEqual({ divergedAt: "-1", exitCode: 0 });
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});
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