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familysync/apps/api/tests/lib/pushCoalescer.test.ts
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TypeScript

/**
* RED scaffold — pushCoalescer (Plan 05-03 turns this GREEN).
*
* Asserts that coalesceListPush:
* - Fires the dispatch function exactly ONCE when N calls arrive within the coalesce window
* - Passes the correct count (N) to the dispatch function
* - Passes the actor's own userId as excludeUserId to suppress self-notifications (D-03)
*
* These tests fail now because pushCoalescer.ts does not yet exist.
* Run: pnpm --filter @familysync/api exec vitest run tests/lib/pushCoalescer.test.ts
*/
import { describe, it, expect, vi, beforeEach, afterEach } from 'vitest';
describe('pushCoalescer — list-change burst coalescing (D-01)', () => {
beforeEach(() => {
vi.useFakeTimers();
vi.resetModules();
});
afterEach(() => {
vi.useRealTimers();
});
it('collapses N rapid coalesceListPush calls into a single dispatch with count=N', async () => {
const dispatch = vi.fn().mockResolvedValue(undefined);
const { coalesceListPush } = await import('../../src/lib/pushCoalescer.js');
const listId = 1;
const actorId = 10;
const N = 5;
for (let i = 0; i < N; i++) {
coalesceListPush(listId, actorId, dispatch);
}
// Advance time past the coalesce window
await vi.runAllTimersAsync();
expect(dispatch).toHaveBeenCalledTimes(1);
const [calledListId, calledActorId, calledCount] = dispatch.mock.calls[0];
expect(calledListId).toBe(listId);
expect(calledActorId).toBe(actorId);
expect(calledCount).toBe(N);
});
it('passes the actor userId as excludeUserId so the actor does not notify themselves (D-03)', async () => {
const dispatch = vi.fn().mockResolvedValue(undefined);
const { coalesceListPush } = await import('../../src/lib/pushCoalescer.js');
const listId = 2;
const actorId = 99;
coalesceListPush(listId, actorId, dispatch);
await vi.runAllTimersAsync();
expect(dispatch).toHaveBeenCalledTimes(1);
const [, calledActorId] = dispatch.mock.calls[0];
expect(calledActorId).toBe(actorId);
});
it('fires separate dispatches for different lists independently', async () => {
const dispatch = vi.fn().mockResolvedValue(undefined);
const { coalesceListPush } = await import('../../src/lib/pushCoalescer.js');
coalesceListPush(1, 10, dispatch);
coalesceListPush(1, 10, dispatch);
coalesceListPush(2, 10, dispatch); // different list
coalesceListPush(2, 10, dispatch);
await vi.runAllTimersAsync();
// Two separate dispatches — one per distinct listId
expect(dispatch).toHaveBeenCalledTimes(2);
});
});