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// Copyright 2017 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
// Flags: --allow-natives-syntax
testAsync(test => {
test.plan(2);
async function* gen() {
return;
test.unreachable();
}
let didResolvePromise = false;
gen().next().then(
(iterResult) => {
test.equals(false, didResolvePromise);
test.equals({ value: undefined, done: true }, iterResult);
},
test.unexpectedRejection());
// Race: generator request's promise should resolve before this Promise.
Promise.resolve("already-resolved").then(
_ => { didResolvePromise = true },
test.unexpectedRejection());
}, "return-race-no-operand");
testAsync(test => {
test.plan(2);
async function* gen() {
return undefined;
test.unreachable();
}
let didResolvePromise = false;
gen().next().then(
(iterResult) => {
test.equals(true, didResolvePromise);
test.equals({ value: undefined, done: true }, iterResult);
},
test.unexpectedRejection());
// Race: generator request's promise should resolve after this Promise.
Promise.resolve("already-resolved").then(
_ => { didResolvePromise = true },
test.unexpectedRejection());
}, "return-race-with-operand");
// Return a thenable which is never settled
testAsync(test => {
test.plan(0);
let promise = { then() { } };
async function* gen() {
return promise;
test.unreachable();
}
gen().next().then(
(iterResult) => test.unreachable(),
test.unexpectedRejection());
}, "return-await-thenable-pending");
// Return a thenable which is fulfilled later
testAsync(test => {
test.plan(2);
let resolve;
let awaitedThenable = { then(resolveFn) { resolve = resolveFn; } };
let finallyEvaluated = false;
async function* gen() {
try {
return awaitedThenable;
} finally {
finallyEvaluated = true;
}
}
gen().next().then(
(iterResult) => {
test.equals({ value: "resolvedPromise", done: true }, iterResult);
test.equals(true, finallyEvaluated);
},
test.unexpectedRejection());
test.drainMicrotasks();
resolve("resolvedPromise");
}, "yield-await-thenable-resolved");
// Return a thenable which is rejected later
testAsync(test => {
test.plan(2);
let reject;
let awaitedThenable = { then(resolveFn, rejectFn) { reject = rejectFn; } };
async function* gen() {
try {
yield awaitedThenable;
} catch (e) {
test.equals("rejection", e);
return e;
}
}
gen().next().then(
(iterResult) => {
test.equals({ value: "rejection", done: true }, iterResult);
},
test.unexpectedRejection());
test.drainMicrotasks();
reject("rejection");
}, "yield-await-thenable-rejected");
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