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async.js
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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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