35 lines
1.3 KiB
TypeScript
35 lines
1.3 KiB
TypeScript
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import { expect, test } from "bun:test";
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import { statSync, utimesSync } from "fs";
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import { stat } from "fs/promises";
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import { tempDir } from "harness";
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import { join } from "path";
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test("fs.stat *Ms properties preserve sub-millisecond precision", async () => {
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using dir = tempDir("stat-ms-precision", {
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"test.txt": "hello",
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});
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const filePath = join(String(dir), "test.txt");
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// Set known fractional timestamps: 1700000000.5005 seconds = 1700000000500.5 ms
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// Using .5005 (500.5ms) ensures clear sub-millisecond component (.5ms)
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// that survives filesystem round-trip even with microsecond-precision utimes.
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const fractionalTime = 1700000000.5005;
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utimesSync(filePath, fractionalTime, fractionalTime);
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const syncStats = statSync(filePath);
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const asyncStats = await stat(filePath);
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const expectedMs = fractionalTime * 1000; // 1700000000500.5
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for (const s of [syncStats, asyncStats]) {
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// atimeMs and mtimeMs should have fractional milliseconds
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expect(Number.isInteger(s.atimeMs)).toBe(false);
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expect(Number.isInteger(s.mtimeMs)).toBe(false);
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// Verify the values match what we set (within 0.05ms / 50 microsecond tolerance)
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expect(s.atimeMs).toBeCloseTo(expectedMs, 1);
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expect(s.mtimeMs).toBeCloseTo(expectedMs, 1);
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}
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});
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