95 lines
2.8 KiB
JavaScript
95 lines
2.8 KiB
JavaScript
describe("basic behavior", () => {
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test("empty array", () => {
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var enteredFunction = false;
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var rejected = false;
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async function f() {
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enteredFunction = true;
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for await (const v of []) {
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expect().fail("Should not enter loop");
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}
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}
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f().then(
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() => {
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expect(enteredFunction).toBeTrue();
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},
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() => {
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rejected = true;
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}
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);
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runQueuedPromiseJobs();
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expect(enteredFunction).toBeTrue();
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expect(rejected).toBeFalse();
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});
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test("sync iterator", () => {
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var loopIterations = 0;
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var rejected = false;
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async function f() {
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for await (const v of [1]) {
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expect(v).toBe(1);
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loopIterations++;
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}
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}
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f().then(
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() => {
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expect(loopIterations).toBe(1);
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},
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() => {
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rejected = true;
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}
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);
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runQueuedPromiseJobs();
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expect(loopIterations).toBe(1);
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expect(rejected).toBeFalse();
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});
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test("can break a for-await-of loop", () => {
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var loopIterations = 0;
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var rejected = false;
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async function f() {
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for await (const v of [1, 2, 3]) {
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expect(v).toBe(1);
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loopIterations++;
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break;
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}
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}
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f().then(
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() => {
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expect(loopIterations).toBe(1);
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},
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() => {
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rejected = true;
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}
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);
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runQueuedPromiseJobs();
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expect(loopIterations).toBe(1);
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expect(rejected).toBeFalse();
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});
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});
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describe("only allowed in async functions", () => {
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test("async functions", () => {
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expect("async function foo() { for await (const v of []) return v; }").toEval();
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expect("(async function () { for await (const v of []) return v; })").toEval();
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expect("async () => { for await (const v of []) return v; }").toEval();
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});
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test("regular functions", () => {
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expect("function foo() { for await (const v of []) return v; }").not.toEval();
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expect("(function () { for await (const v of []) return v; })").not.toEval();
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expect("() => { for await (const v of []) return v; }").not.toEval();
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});
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test("generator functions", () => {
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expect("function* foo() { for await (const v of []) return v; }").not.toEval();
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expect("(function* () { for await (const v of []) return v; })").not.toEval();
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});
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test("async generator functions", () => {
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expect("async function* foo() { for await (const v of []) yield v; }").toEval();
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expect("(async function* () { for await (const v of []) yield v; })").toEval();
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});
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});
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