jest-async
Simplify Jest parallel testing.
This allows you to write fast test code.
The return value of each test can be received by Promise.
You can synchronize by waiting for them with "await".
Example
- Async Test
import { testAsync, beforeAllAsync, afterAllAsync } from "jest-async";
const sleep = (value: number) =>
new Promise((resolve) => setTimeout(resolve, value));
describe("Test", () => {
const initWait = beforeAllAsync(async () => {
await sleep(1000);
console.log("beforeAll");
});
const A = testAsync("A", async () => {
await sleep(1000);
await initWait;
console.log("A");
return 100;
});
const B = testAsync("B", async () => {
await sleep(4000);
await initWait;
console.log("B");
return 200;
});
testAsync("C", async () => {
await sleep(3000);
const value = (await A) + (await B);
console.log("C", value);
expect(value).toBe(300);
});
testAsync("D", async () => {
await sleep(2000);
console.log("D");
});
afterAllAsync(async () => {
console.log("afterAll");
});
});
/*
1,000 + 1,000 + 4,000 + 3,000 + 2,000 = 11,000ms
↓ Parallel execution
4,541ms
console.log
beforeAll
at log (test/test01.test.ts:9:13)
console.log
A
at log (test/test01.test.ts:14:13)
console.log
D
at log (test/test01.test.ts:31:13)
console.log
B
at log (test/test01.test.ts:20:13)
console.log
C 300
at log (test/test01.test.ts:26:13)
console.log
afterAll
at log (test/test01.test.ts:34:13)
PASS test/test01.test.ts
Test
√ A (1 ms)
√ B (2990 ms)
√ C
√ D
Test Suites: 1 passed, 1 total
Tests: 4 passed, 4 total
Snapshots: 0 total
Time: 4.541 s, estimated 5 s
*/- Sync Test
import { beforeAllAsync, testSync, afterAllAsync } from "jest-async";
const sleep = (value: number) =>
new Promise((resolve) => setTimeout(resolve, value));
describe("Test2", () => {
const initWait = beforeAllAsync(async () => {
await sleep(1000);
console.log("beforeAll2");
});
const A = testSync("A2", async () => {
await sleep(1000);
await initWait;
console.log("A2");
return 100;
});
const B = testSync("B2", async () => {
await sleep(4000);
await initWait;
console.log("B2");
return 200;
});
testSync("C2", async () => {
await sleep(3000);
const value = (await A) + (await B);
console.log("C2", value);
expect(value).toBe(300);
});
testSync("D2", async () => {
await sleep(2000);
console.log("D2");
});
afterAllAsync(async () => {
console.log("afterAll2");
});
});
/*
console.log
beforeAll2
at log (test/test02.test.ts:9:13)
console.log
A2
at log (test/test02.test.ts:14:13)
console.log
B2
at log (test/test02.test.ts:20:13)
console.log
C2 300
at log (test/test02.test.ts:26:13)
console.log
D2
at log (test/test02.test.ts:31:13)
console.log
afterAll2
at log (test/test02.test.ts:34:13)
PASS test/test02.test.ts (11.329 s)
Test2
√ A2 (1018 ms)
√ B2 (4003 ms)
√ C2 (3011 ms)
√ D2 (2008 ms)
Test Suites: 1 passed, 1 total
Tests: 4 passed, 4 total
Snapshots: 0 total
Time: 11.596 s, estimated 12 s