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test(time): cover fractional timestamp precision #654

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TheVicky1 merged 1 commit into from
Oct 24, 2026
Merged

test(time): cover fractional timestamp precision #654

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67 changes: 67 additions & 0 deletions tests/temporal-engine.test.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -265,6 +265,73 @@ function runTemporalEngineTestSuite() {
assert.strictEqual(NegativeMinutesConverted, 0);
console.log('✅ Case 2: Negative minutes handled properly.');


// ----------------------------------------------------------------
// 11. FRACTIONAL-SECOND & MILLISECOND PRECISION TESTS
// ----------------------------------------------------------------
console.log('11. Testing Fractional-Second & Millisecond Precision...');

// 11.1 Instants separated by 5 milliseconds must be ordered correctly.
assert.ok(
compareInstants('2026-10-15T12:00:00.100Z', '2026-10-15T12:00:00.105Z') < 0
);
assert.ok(
compareInstants('2026-10-15T12:00:00.105Z', '2026-10-15T12:00:00.100Z') > 0
);

// 11.2 Different fractional representations of the same instant are equal.
assert.strictEqual(
compareInstants('2026-10-15T12:00:00.1Z', '2026-10-15T12:00:00.10Z'),
0
);
assert.strictEqual(
compareInstants('2026-10-15T12:00:00.000Z', '2026-10-15T12:00:00Z'),
0
);

// 11.3 UTC-to-local display remains consistent for fractional-second inputs.
const expectedDisplay = utcToLocal('2026-10-15T12:00:00.000Z', 'UTC');
for (const timestamp of [
'2026-10-15T12:00:00.1Z',
'2026-10-15T12:00:00.12Z',
'2026-10-15T12:00:00.123Z',
'2026-10-15T12:00:00.000Z'
]) {
assert.strictEqual(utcToLocal(timestamp, 'UTC'), expectedDisplay);
}

// 11.4 Deadline checks must respect the exact millisecond boundary.
const fractionalDeadline = '2026-10-15T12:00:00.105Z';
assert.strictEqual(
isDeadlineReached(fractionalDeadline, new TestClock('2026-10-15T12:00:00.104Z')),
false,
'A deadline must not be reached 1 ms early'
);
assert.strictEqual(
isDeadlineReached(fractionalDeadline, new TestClock('2026-10-15T12:00:00.105Z')),
true,
'A deadline must be reached at the exact millisecond'
);
assert.strictEqual(
isDeadlineReached(fractionalDeadline, new TestClock('2026-10-15T12:00:00.106Z')),
true,
'A deadline must remain reached 1 ms later'
);

// 11.5 datetime-local input intentionally omits seconds and fractions.
for (const timestamp of [
'2026-10-15T12:00:00.1Z',
'2026-10-15T12:00:00.12Z',
'2026-10-15T12:00:00.123Z',
'2026-10-15T12:00:00.000Z'
]) {
assert.strictEqual(
utcToDatetimeLocalInput(timestamp, 'Asia/Kolkata'),
'2026-10-15T17:30'
);
}

console.log('Fractional-second and millisecond precision tests passed.\n');
console.log('================================================================');
console.log('🎉 ALL TEMPORAL ENGINE & TIMEZONE UNIT TESTS PASSED CLEANLY');
console.log('================================================================\n');
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