Jesse_Chen
58 lines
1.9 KiB
TypeScript
58 lines
1.9 KiB
TypeScript
import assert from "node:assert/strict";
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import test from "node:test";
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import {
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clampSessionLimit,
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compareSessionCursor,
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encodeSessionCursor,
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nextSessionCursor,
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parseSessionCursor,
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SESSION_PAGE_SIZE,
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} from "../src/lib/session-cursor.ts";
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const leftId = "11111111-1111-4111-8111-111111111111";
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const rightId = "22222222-2222-4222-8222-222222222222";
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const stamp = "2026-09-06T04:00:00.000Z";
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test("encodeSessionCursor round-trips a valid pair", () => {
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const encoded = encodeSessionCursor(stamp, leftId);
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assert.deepEqual(parseSessionCursor(encoded), { updatedAt: stamp, id: leftId });
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});
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test("parseSessionCursor returns null for illegal strings", () => {
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assert.equal(parseSessionCursor(null), null);
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assert.equal(parseSessionCursor(""), null);
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assert.equal(parseSessionCursor("not-a-date,11111111-1111-4111-8111-111111111111"), null);
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assert.equal(parseSessionCursor(`${stamp},not-a-uuid`), null);
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assert.equal(parseSessionCursor(stamp), null);
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});
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test("compareSessionCursor uses id when the timestamp is the same", () => {
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const sameTime = compareSessionCursor(
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{ updatedAt: stamp, id: leftId },
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{ updatedAt: stamp, id: rightId },
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);
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assert.ok(sameTime > 0);
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const newerTime = compareSessionCursor(
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{ updatedAt: "2026-09-06T05:00:00.000Z", id: leftId },
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{ updatedAt: stamp, id: rightId },
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);
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assert.ok(newerTime < 0);
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});
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test("clampSessionLimit defaults to 40 and clamps 1–100", () => {
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assert.equal(clampSessionLimit(null), SESSION_PAGE_SIZE);
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assert.equal(clampSessionLimit("0"), 1);
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assert.equal(clampSessionLimit("101"), 100);
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assert.equal(clampSessionLimit("40"), 40);
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});
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test("nextSessionCursor is null when the page is short, else encodes the limit-th row", () => {
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const rows = [
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{ id: leftId, updated_at: stamp },
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{ id: rightId, updated_at: stamp },
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];
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assert.equal(nextSessionCursor(rows, 40), null);
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assert.equal(nextSessionCursor(rows, 1), encodeSessionCursor(stamp, leftId));
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});
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