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terminal-cv/node_modules/@parcel/utils/test/PromiseQueue.test.js

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2.3 KiB

// @flow
import assert from 'assert';
import randomInt from 'random-int';
import PromiseQueue from '../src/PromiseQueue';
describe('PromiseQueue', () => {
it('run() should resolve when all async functions in queue have completed', async () => {
let queue = new PromiseQueue();
let someBooleanToBeChanged = false;
queue.add(() =>
Promise.resolve().then(() => {
someBooleanToBeChanged = true;
}),
);
await queue.run();
assert(someBooleanToBeChanged);
});
it('run() should reject if any of the async functions in the queue failed', async () => {
let error = new Error('some failure');
try {
let queue = new PromiseQueue();
queue
.add(() => Promise.reject(error))
.catch(
/* catch this to prevent an unhandled promise rejection*/ () => {},
);
await queue.run();
} catch (e) {
assert.equal(e, error);
}
});
it('.run() should instantly resolve when the queue is empty', async () => {
let queue = new PromiseQueue();
await queue.run();
// no need to assert, test will hang or throw an error if condition fails
});
it(".add() should resolve with the same result when the passed in function's promise resolves", async () => {
let queue = new PromiseQueue();
let promise = queue.add(() => Promise.resolve(42));
await queue.run();
let result = await promise;
assert.equal(result, 42);
});
it(".add() should reject with the same error when the passed in function's promise rejects", async () => {
let queue = new PromiseQueue();
let error = new Error('Oh no!');
let promise = queue.add(() => Promise.reject(error));
await queue.run().catch(() => null);
await promise.then(null, e => assert.equal(e, error));
});
it('constructor() should allow for configuration of max concurrent running functions', async () => {
const maxConcurrent = 5;
const queue = new PromiseQueue({maxConcurrent});
let running = 0;
new Array(100).fill(0).map(() =>
queue.add(async () => {
running++;
assert(queue._numRunning === running);
assert(running <= maxConcurrent);
await Promise.resolve(randomInt(1, 10)); //sleep(randomInt(1, 10));
running--;
}),
);
await queue.run();
});
});