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ant/examples/spec/async.js
da28911c0817bytecode

async.js
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			import { test, summary } from './helpers.js';

			console.log('Async/Await Tests\n');

			let results = {};

			async function basicAsync() {
			return 42;
			}
			basicAsync().then(v => {
			results.basic = v;
			});

			const arrowAsync = async () => 'arrow result';
			arrowAsync().then(v => {
			results.arrow = v;
			});

			const singleParam = async x => x * 2;
			singleParam(21).then(v => {
			results.singleParam = v;
			});

			const multiParam = async (a, b) => a + b;
			multiParam(10, 32).then(v => {
			results.multiParam = v;
			});

			async function withPromise() {
			return Promise.resolve('promise from async');
			}
			withPromise().then(v => {
			results.withPromise = v;
			});

			async function conditional(flag) {
			if (flag) return 'true branch';
			return 'false branch';
			}
			conditional(true).then(v => {
			results.condTrue = v;
			});
			conditional(false).then(v => {
			results.condFalse = v;
			});

			const obj = {
			value: 100,
			asyncMethod: async function () {
			return this.value;
			}
			};
			obj.asyncMethod().then(v => {
			results.objMethod = v;
			});

			Promise.resolve(1)
			.then(v => v + 1)
			.then(v => v + 1)
			.then(v => v + 1)
			.then(v => {
			results.chain = v;
			});

			async function awaiter() {
			const a = await Promise.resolve(1);
			const b = await Promise.resolve(2);
			return a + b;
			}
			awaiter().then(v => {
			results.awaiter = v;
			});

			async function awaitValue() {
			return await 42;
			}
			awaitValue().then(v => {
			results.awaitValue = v;
			});

			let finallyCalledResolve = false;
			Promise.resolve('original')
			.finally(() => {
			finallyCalledResolve = true;
			return 'ignored';
			})
			.then(v => {
			results.finallyNoChange = v;
			});

			let finallyCalledReject = false;
			Promise.reject('rejected reason')
			.finally(() => {
			finallyCalledReject = true;
			return 'also ignored';
			})
			.catch(e => {
			results.finallyRejectPass = e;
			});

			Promise.reject('foobar')
			.finally(() => {
			throw new Error('bar');
			})
			.catch(e => {
			results.finallyThrowError = e.message;
			});

			Promise.reject('foobar')
			.finally(() => {
			return Promise.reject('changed');
			})
			.catch(e => {
			results.finallyRejectChange = e;
			});

			async function awaitLoop() {
			let sum = 0;
			for (let i = 0; i < 3; i++) {
			sum += await Promise.resolve(i);
			}
			return sum;
			}
			awaitLoop().then(v => {
			results.awaitLoop = v;
			});

			async function inner() {
			return await Promise.resolve(10);
			}
			async function outer() {
			return (await inner()) + (await inner());
			}
			outer().then(v => {
			results.nestedAsync = v;
			});

			async function sequential() {
			const a = await Promise.resolve(1);
			const b = await Promise.resolve(2);
			const c = await Promise.resolve(3);
			return a + b + c;
			}
			sequential().then(v => {
			results.sequential = v;
			});

			setTimeout(() => {
			test('basic async', results.basic, 42);
			test('arrow async', results.arrow, 'arrow result');
			test('single param async', results.singleParam, 42);
			test('multi param async', results.multiParam, 42);
			test('with promise', results.withPromise, 'promise from async');
			test('conditional true', results.condTrue, 'true branch');
			test('conditional false', results.condFalse, 'false branch');
			test('object method', results.objMethod, 100);
			test('promise chain', results.chain, 4);
			test('awaiter sum', results.awaiter, 3);
			test('await value', results.awaitValue, 42);
			test('finally no change resolve', results.finallyNoChange, 'original');
			test('finally called on resolve', finallyCalledResolve, true);
			test('finally passes rejection', results.finallyRejectPass, 'rejected reason');
			test('finally called on reject', finallyCalledReject, true);
			test('finally throw changes rejection', results.finallyThrowError, 'bar');
			test('finally reject changes rejection', results.finallyRejectChange, 'changed');
			test('await in loop', results.awaitLoop, 3);
			test('nested async', results.nestedAsync, 20);
			test('sequential awaits', results.sequential, 6);
			summary();
			}, 50);

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