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bus.test.ts
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219 lines (183 loc) · 6.43 KB
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import { afterEach, describe, expect, test } from "bun:test"
import z from "zod"
import { Bus } from "../../src/bus"
import { BusEvent } from "../../src/bus/bus-event"
import { Instance } from "../../src/project/instance"
import { tmpdir } from "../fixture/fixture"
const TestEvent = {
Ping: BusEvent.define("test.ping", z.object({ value: z.number() })),
Pong: BusEvent.define("test.pong", z.object({ message: z.string() })),
}
function withInstance(directory: string, fn: () => Promise<void>) {
return Instance.provide({ directory, fn })
}
describe("Bus", () => {
afterEach(() => Instance.disposeAll())
describe("publish + subscribe", () => {
test("subscriber is live immediately after subscribe returns", async () => {
await using tmp = await tmpdir()
const received: number[] = []
await withInstance(tmp.path, async () => {
Bus.subscribe(TestEvent.Ping, (evt) => {
received.push(evt.properties.value)
})
await Bus.publish(TestEvent.Ping, { value: 42 })
await Bun.sleep(10)
})
expect(received).toEqual([42])
})
test("subscriber receives matching events", async () => {
await using tmp = await tmpdir()
const received: number[] = []
await withInstance(tmp.path, async () => {
Bus.subscribe(TestEvent.Ping, (evt) => {
received.push(evt.properties.value)
})
// Give the subscriber fiber time to start consuming
await Bun.sleep(10)
await Bus.publish(TestEvent.Ping, { value: 42 })
await Bus.publish(TestEvent.Ping, { value: 99 })
// Give subscriber time to process
await Bun.sleep(10)
})
expect(received).toEqual([42, 99])
})
test("subscriber does not receive events of other types", async () => {
await using tmp = await tmpdir()
const pings: number[] = []
await withInstance(tmp.path, async () => {
Bus.subscribe(TestEvent.Ping, (evt) => {
pings.push(evt.properties.value)
})
await Bun.sleep(10)
await Bus.publish(TestEvent.Pong, { message: "hello" })
await Bus.publish(TestEvent.Ping, { value: 1 })
await Bun.sleep(10)
})
expect(pings).toEqual([1])
})
test("publish with no subscribers does not throw", async () => {
await using tmp = await tmpdir()
await withInstance(tmp.path, async () => {
await Bus.publish(TestEvent.Ping, { value: 1 })
})
})
})
describe("unsubscribe", () => {
test("unsubscribe stops delivery", async () => {
await using tmp = await tmpdir()
const received: number[] = []
await withInstance(tmp.path, async () => {
const unsub = Bus.subscribe(TestEvent.Ping, (evt) => {
received.push(evt.properties.value)
})
await Bun.sleep(10)
await Bus.publish(TestEvent.Ping, { value: 1 })
await Bun.sleep(10)
unsub()
await Bun.sleep(10)
await Bus.publish(TestEvent.Ping, { value: 2 })
await Bun.sleep(10)
})
expect(received).toEqual([1])
})
})
describe("subscribeAll", () => {
test("subscribeAll is live immediately after subscribe returns", async () => {
await using tmp = await tmpdir()
const received: string[] = []
await withInstance(tmp.path, async () => {
Bus.subscribeAll((evt) => {
received.push(evt.type)
})
await Bus.publish(TestEvent.Ping, { value: 1 })
await Bun.sleep(10)
})
expect(received).toEqual(["test.ping"])
})
test("receives all event types", async () => {
await using tmp = await tmpdir()
const received: string[] = []
await withInstance(tmp.path, async () => {
Bus.subscribeAll((evt) => {
received.push(evt.type)
})
await Bun.sleep(10)
await Bus.publish(TestEvent.Ping, { value: 1 })
await Bus.publish(TestEvent.Pong, { message: "hi" })
await Bun.sleep(10)
})
expect(received).toContain("test.ping")
expect(received).toContain("test.pong")
})
})
describe("multiple subscribers", () => {
test("all subscribers for same event type are called", async () => {
await using tmp = await tmpdir()
const a: number[] = []
const b: number[] = []
await withInstance(tmp.path, async () => {
Bus.subscribe(TestEvent.Ping, (evt) => {
a.push(evt.properties.value)
})
Bus.subscribe(TestEvent.Ping, (evt) => {
b.push(evt.properties.value)
})
await Bun.sleep(10)
await Bus.publish(TestEvent.Ping, { value: 7 })
await Bun.sleep(10)
})
expect(a).toEqual([7])
expect(b).toEqual([7])
})
})
describe("instance isolation", () => {
test("events in one directory do not reach subscribers in another", async () => {
await using tmpA = await tmpdir()
await using tmpB = await tmpdir()
const receivedA: number[] = []
const receivedB: number[] = []
await withInstance(tmpA.path, async () => {
Bus.subscribe(TestEvent.Ping, (evt) => {
receivedA.push(evt.properties.value)
})
await Bun.sleep(10)
})
await withInstance(tmpB.path, async () => {
Bus.subscribe(TestEvent.Ping, (evt) => {
receivedB.push(evt.properties.value)
})
await Bun.sleep(10)
})
await withInstance(tmpA.path, async () => {
await Bus.publish(TestEvent.Ping, { value: 1 })
await Bun.sleep(10)
})
await withInstance(tmpB.path, async () => {
await Bus.publish(TestEvent.Ping, { value: 2 })
await Bun.sleep(10)
})
expect(receivedA).toEqual([1])
expect(receivedB).toEqual([2])
})
})
describe("instance disposal", () => {
test("InstanceDisposed is delivered to wildcard subscribers before stream ends", async () => {
await using tmp = await tmpdir()
const received: string[] = []
await withInstance(tmp.path, async () => {
Bus.subscribeAll((evt) => {
received.push(evt.type)
})
await Bun.sleep(10)
await Bus.publish(TestEvent.Ping, { value: 1 })
await Bun.sleep(10)
})
// Instance.disposeAll triggers the finalizer which publishes InstanceDisposed
await Instance.disposeAll()
await Bun.sleep(50)
expect(received).toContain("test.ping")
expect(received).toContain(Bus.InstanceDisposed.type)
})
})
})