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import { OrderedHookSlot, createHooks } from '#/hooks';
describe('OrderedHookSlot', () => {
it('runs the terminal when no handlers are registered', async () => {
const slot = new OrderedHookSlot<{ value: number }>();
let terminalRan = false;
await slot.run({ value: 0 }, async () => {
terminalRan = true;
});
expect(terminalRan).toBe(true);
});
it('runs handlers in registration order and threads context', async () => {
const slot = new OrderedHookSlot<{ value: number }>();
const order: string[] = [];
slot.register('a', async (ctx, next) => {
order.push('a');
ctx.value += 1;
await next();
});
slot.register('b', async (ctx, next) => {
order.push('b');
ctx.value += 10;
await next();
});
const ctx = { value: 0 };
await slot.run(ctx);
expect(order).toEqual(['a', 'b']);
expect(ctx.value).toBe(11);
});
it('removes a handler with delete()', async () => {
const slot = new OrderedHookSlot<Record<string, never>>();
const order: string[] = [];
slot.register('a', async (_ctx, next) => {
order.push('a');
await next();
});
slot.register('b', async (_ctx, next) => {
order.push('b');
await next();
});
expect(slot.delete('a')).toBe(true);
await slot.run({});
expect(order).toEqual(['b']);
});
it('honors before / after ordering', async () => {
const slot = new OrderedHookSlot<Record<string, never>>();
const order: string[] = [];
const mk =
(id: string) =>
async (_ctx: Record<string, never>, next: () => Promise<void>) => {
order.push(id);
await next();
};
slot.register('a', mk('a'));
slot.register('c', mk('c'));
slot.register('b', mk('b'), { before: 'c' });
await slot.run({});
expect(order).toEqual(['a', 'b', 'c']);
});
it('re-runs the remaining chain when next() is called more than once', async () => {
const slot = new OrderedHookSlot<Record<string, never>>();
let terminalRuns = 0;
slot.register('a', async (_ctx, next) => {
await next();
await next();
});
await slot.run({}, async () => {
terminalRuns += 1;
});
expect(terminalRuns).toBe(2);
});
it('skips downstream handlers and the terminal when next() is not called', async () => {
const slot = new OrderedHookSlot<{ value: number }>();
const order: string[] = [];
slot.register('veto', () => {
order.push('veto');
});
slot.register('downstream', async (_ctx, next) => {
order.push('downstream');
await next();
});
let terminalRan = false;
await slot.run({ value: 0 }, async () => {
terminalRan = true;
});
expect(order).toEqual(['veto']);
expect(terminalRan).toBe(false);
});
it('re-runs the remaining chain and terminal on each next() call', async () => {
const slot = new OrderedHookSlot<{ attempt: number; result?: string }>();
const attempts: number[] = [];
slot.register('retry', async (ctx, next) => {
ctx.attempt = 1;
await next();
if (ctx.result === 'fail') {
ctx.attempt = 2;
await next();
}
});
slot.register('downstream', async (ctx, next) => {
attempts.push(ctx.attempt);
await next();
});
const ctx: { attempt: number; result?: string } = { attempt: 0 };
await slot.run(ctx, async (current) => {
current.result = current.attempt === 1 ? 'fail' : 'ok';
});
expect(attempts).toEqual([1, 2]);
expect(ctx.result).toBe('ok');
});
it('resumes the remaining chain and terminal with a forked context', async () => {
interface Ctx {
readonly id: number;
value: number;
result?: number;
}
const slot = new OrderedHookSlot<Ctx>();
const seen: number[] = [];
slot.register('fork', async (ctx, next) => {
const fork: Ctx = { ...ctx, value: 100 };
await next(fork);
ctx.result = fork.result;
});
slot.register('downstream', async (ctx, next) => {
seen.push(ctx.value);
await next();
});
const original: Ctx = { id: 1, value: 0 };
await slot.run(original, async (current) => {
current.result = current.value + 1;
});
expect(seen).toEqual([100]);
expect(original.value).toBe(0);
expect(original.result).toBe(101);
});
it('propagates a fork through nested next() calls without arguments', async () => {
interface Ctx {
value: number;
}
const slot = new OrderedHookSlot<Ctx>();
slot.register('fork', async (ctx, next) => {
await next({ ...ctx, value: 42 });
});
slot.register('middle', async (_ctx, next) => {
await next();
});
let terminalValue: number | undefined;
await slot.run({ value: 0 }, async (current) => {
terminalValue = current.value;
});
expect(terminalValue).toBe(42);
});
it('runs forked branches concurrently', async () => {
interface Ctx {
input: number;
output?: number;
}
const slot = new OrderedHookSlot<Ctx>();
slot.register('race', async (ctx, next) => {
const forks: Ctx[] = [
{ ...ctx, input: 1 },
{ ...ctx, input: 2 },
];
await Promise.all(forks.map((fork) => next(fork)));
ctx.output = Math.max(...forks.map((fork) => fork.output ?? 0));
});
const ctx: Ctx = { input: 0 };
await slot.run(ctx, async (current) => {
current.output = current.input * 10;
});
expect(ctx.output).toBe(20);
});
});
describe('createHooks', () => {
it('creates one slot per event key', () => {
type HookEvents = { start: { x: number }; stop: { y: number } };
const hooks = createHooks<HookEvents, keyof HookEvents>(['start', 'stop']);
expect(hooks.start).toBeInstanceOf(OrderedHookSlot);
expect(hooks.stop).toBeInstanceOf(OrderedHookSlot);
});
});
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