378595e8b1
The first test crashes in AST, and fails in bytecode, so the best thing which we can do here without complicated test setup logic is to just skip this test for now. Interestinglny, this crashing test is very similar to the existing thenable test case, and only differs in the way that the thenable is given to the async function. The next two tests are effectively the same as the above two mentioned tests, with the only different being that the thenable calls the fulfill function. For the test case that crashes in AST mode, doing that appears to fix the test case for AST mode (but both still fail in bytecode).
271 lines
8.7 KiB
JavaScript
271 lines
8.7 KiB
JavaScript
describe("parsing freestanding async functions", () => {
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test("simple", () => {
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expect(`async function foo() {}`).toEval();
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// Although it does not create an async function it is valid.
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expect(`async
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function foo() {}`).toEval();
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expect(`async function await() {}`).toEval();
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expect(`async function yield() {}`).toEval();
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});
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test("await expression", () => {
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expect(`async function foo() { await bar(); }`).toEval();
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expect(`async function foo() { await; }`).not.toEval();
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expect(`function foo() { await bar(); }`).not.toEval();
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expect(`function foo() { await; }`).toEval();
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expect(`\\u0061sync function foo() { await bar(); }`).not.toEval();
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expect(`\\u0061sync function foo() { \\u0061wait bar(); }`).not.toEval();
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expect(`async function foo() { \\u0061wait bar(); }`).not.toEval();
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});
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});
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describe("parsing object literal async functions", () => {
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test("simple", () => {
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expect(`x = { async foo() { } }`).toEval();
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expect(`x = { async
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foo() { } }`).not.toEval();
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});
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test("property on object called async", () => {
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expect(`x = { async() { } }`).toEval();
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expect(`x = { async() { await 4; } }`).not.toEval();
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expect(`x = { async: 3 }`).toEval();
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expect(`x = { async: await 3, }`).not.toEval();
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});
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test("await expression", () => {
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expect(`x = { foo() { await bar(); } }`).not.toEval();
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expect(`x = { foo() { await; } }`).toEval();
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expect(`x = { async foo() { await bar(); } }`).toEval();
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expect(`x = { async foo() { await; } }`).not.toEval();
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});
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});
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describe("parsing classes with async methods", () => {
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test("simple", () => {
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expect(`class Foo { async foo() {} }`).toEval();
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expect(`class Foo { static async foo() {} }`).toEval();
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expect(`class Foo { async foo() { await bar(); } }`).toEval();
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expect(`class Foo { async foo() { await; } }`).not.toEval();
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expect(`class Foo { async constructor() {} }`).not.toEval();
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});
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});
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test("function expression names equal to 'await'", () => {
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expect(`async function foo() { (function await() {}); }`).toEval();
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expect(`async function foo() { function await() {} }`).not.toEval();
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});
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test("async function cannot use await in default parameters", () => {
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expect("async function foo(x = await 3) {}").not.toEval();
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expect("async function foo(x = await 3) {}").not.toEval();
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// Even as a reference to some variable it is not allowed
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expect(`
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var await = 4;
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async function foo(x = await) {}
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`).not.toEval();
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});
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describe("async arrow functions", () => {
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test("basic syntax", () => {
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expect("async () => await 3;").toEval();
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expect("async param => await param();").toEval();
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expect("async (param) => await param();").toEval();
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expect("async (a, b) => await a();").toEval();
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expect("async () => { await 3; }").toEval();
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expect("async param => { await param(); }").toEval();
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expect("async (param) => { await param(); }").toEval();
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expect("async (a, b) => { await a(); }").toEval();
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expect(`async
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() => await 3;`).not.toEval();
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expect("async async => await async()").toEval();
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expect("async => async").toEval();
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expect("async => await async()").not.toEval();
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expect("async (b = await) => await b;").not.toEval();
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expect("async (b = await 3) => await b;").not.toEval();
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// Cannot escape the async keyword and get an async arrow function.
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expect("\\u0061sync () => await 3").not.toEval();
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expect("for (async of => {};false;) {}").toEval();
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expect("for (async of []) {}").not.toEval();
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expect("for (\\u0061sync of []) {}").toEval();
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expect("for (\\u0061sync of => {};false;) {}").not.toEval();
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expect("for (\\u0061sync => {};false;) {}").toEval();
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});
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test("async within a for-loop", () => {
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let called = false;
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// Unfortunately we cannot really test the more horrible case above.
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for (
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const f = async of => {
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return of;
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};
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;
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) {
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expect(f(43)).toBeInstanceOf(Promise);
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called = true;
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break;
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}
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expect(called).toBeTrue();
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});
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});
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test("basic functionality", () => {
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test("simple", () => {
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let executionValue = null;
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let resultValue = null;
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async function foo() {
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executionValue = "someValue";
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return "otherValue";
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}
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const returnValue = foo();
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expect(returnValue).toBeInstanceOf(Promise);
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returnValue.then(result => {
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resultValue = result;
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});
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runQueuedPromiseJobs();
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expect(executionValue).toBe("someValue");
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expect(resultValue).toBe("otherValue");
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});
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test("await", () => {
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let resultValue = null;
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async function foo() {
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return "someValue";
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}
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async function bar() {
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resultValue = await foo();
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}
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bar();
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runQueuedPromiseJobs();
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expect(resultValue).toBe("someValue");
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});
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});
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describe("non async function declaration usage of async still works", () => {
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test("async as a function", () => {
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function async(value = 4) {
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return value;
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}
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expect(async(0)).toBe(0);
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// We use eval here since it otherwise cannot find the async function.
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const evalResult = eval("async(1)");
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expect(evalResult).toBe(1);
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});
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test("async as a variable", () => {
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let async = 3;
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const evalResult = eval("async >= 2");
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expect(evalResult).toBeTrue();
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});
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test("async with line ending does not create a function", () => {
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expect(() => {
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// The ignore is needed otherwise prettier puts a ';' after async.
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// prettier-ignore
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async
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function f() {}
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}).toThrowWithMessage(ReferenceError, "'async' is not defined");
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expect(`async
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function f() { await 3; }`).not.toEval();
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});
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});
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describe("await cannot be used in class static init blocks", () => {
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test("directly", () => {
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expect("class A{ static { await; } }").not.toEval();
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expect("class A{ static { let await = 3; } }").not.toEval();
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expect("class A{ static { call(await); } }").not.toEval();
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expect("class A{ static { for(const await = 1; false ;) {} } }").not.toEval();
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});
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test("via declaration", () => {
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expect("class A{ static { class await {} } }").not.toEval();
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expect("class A{ static { function await() {} } }").not.toEval();
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expect("class A{ static { function* await() {} } }").not.toEval();
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expect("class A{ static { async function* await() {} } }").not.toEval();
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});
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});
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describe("await thenables", () => {
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// FIXME: This test crashes for AST, and fails for bytecode.
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test.skip("async returning a thanable variable without fulfilling", () => {
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let isCalled = false;
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const obj = {
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then() {
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isCalled = true;
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},
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};
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const f = async () => await obj;
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f();
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runQueuedPromiseJobs();
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expect(isCalled).toBe(true);
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});
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test.xfailIf(
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isBytecodeInterpreterEnabled(),
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"async returning a thanable variable that fulfills",
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() => {
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let isCalled = false;
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const obj = {
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then(fulfill) {
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isCalled = true;
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fulfill(isCalled);
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},
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};
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const f = async () => await obj;
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f();
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runQueuedPromiseJobs();
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expect(isCalled).toBe(true);
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}
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);
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test.xfailIf(
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isBytecodeInterpreterEnabled(),
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"async returning a thenable directly without fulfilling",
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() => {
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let isCalled = false;
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const f = async () => ({
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then() {
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isCalled = true;
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},
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});
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f();
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runQueuedPromiseJobs();
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expect(isCalled).toBe(true);
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}
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);
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test.xfailIf(
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isBytecodeInterpreterEnabled(),
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"async returning a thenable directly that fulfills",
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() => {
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let isCalled = false;
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const f = async () => ({
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then(fulfill) {
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isCalled = true;
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fulfill(isCalled);
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},
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});
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f();
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runQueuedPromiseJobs();
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expect(isCalled).toBe(true);
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}
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);
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});
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