72 lines
2.1 KiB
TypeScript
72 lines
2.1 KiB
TypeScript
import { describe, expect, it, vi } from "vitest";
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vi.mock("@/lib/redis", () => ({
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redis: null,
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}));
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import { cached, invalidateMemory } from "./cache";
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describe("cached (memory-only, no Redis)", () => {
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it("computes once and serves the cached value", async () => {
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const fn = vi.fn(async () => 42);
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const key = `once-${Math.random()}`;
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expect(await cached(key, 10_000, fn)).toBe(42);
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expect(await cached(key, 10_000, fn)).toBe(42);
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expect(fn).toHaveBeenCalledTimes(1);
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});
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it("dedupes concurrent misses into a single computation", async () => {
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let resolveFn: (value: number) => void = () => {};
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const fn = vi.fn(
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() =>
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new Promise<number>((resolve) => {
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resolveFn = resolve;
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}),
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);
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const key = `dedupe-${Math.random()}`;
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const p1 = cached(key, 10_000, fn);
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const p2 = cached(key, 10_000, fn);
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const p3 = cached(key, 10_000, fn);
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resolveFn(7);
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expect(await Promise.all([p1, p2, p3])).toEqual([7, 7, 7]);
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expect(fn).toHaveBeenCalledTimes(1);
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});
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it("recomputes after the TTL expires", async () => {
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vi.useFakeTimers();
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try {
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vi.setSystemTime(1_000);
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let count = 0;
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const fn = vi.fn(async () => ++count);
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const key = `ttl-${Math.random()}`;
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expect(await cached(key, 100, fn)).toBe(1);
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expect(await cached(key, 100, fn)).toBe(1);
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vi.advanceTimersByTime(100);
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expect(await cached(key, 100, fn)).toBe(2);
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expect(fn).toHaveBeenCalledTimes(2);
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} finally {
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vi.useRealTimers();
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}
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});
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it("invalidates a key so the next read recomputes", async () => {
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let count = 0;
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const fn = vi.fn(async () => ++count);
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const key = `inv-${Math.random()}`;
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expect(await cached(key, 10_000, fn)).toBe(1);
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invalidateMemory(key);
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expect(await cached(key, 10_000, fn)).toBe(2);
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expect(fn).toHaveBeenCalledTimes(2);
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});
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it("evicts the oldest entry when the in-memory cache is full", async () => {
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const fn = vi.fn(async () => 1);
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for (let i = 0; i < 600; i++) {
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await cached(`bulk-${i}`, 10_000, fn);
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}
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// Key "bulk-0" was evicted (insertion order), so it must recompute.
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await cached("bulk-0", 10_000, fn);
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expect(fn).toHaveBeenCalledTimes(601);
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});
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});
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