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test-yield.js
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test-yield.js
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/**
* Copyright 2017 The AMP HTML Authors. All Rights Reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS-IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
import * as lolex from 'lolex';
import {macroTask} from '../../testing/yield';
describes.realWin('yield', {}, env => {
let win;
let clock;
beforeEach(() => {
win = env.win;
clock = lolex.install(win, 0, ['Date', 'setTimeout', 'clearTimeout']);
});
it('should work with nested promises', function* () {
let value = false;
const nestPromise = level => {
if (level == 0) {
value = true;
return;
}
return Promise.resolve().then(() => {
return nestPromise(level - 1);
});
};
nestPromise(100);
expect(value).to.be.false;
yield macroTask();
expect(value).to.be.true;
});
it('should work with promise chain', function* () {
let value;
const chainPromise = Promise.resolve();
for (let i = 0; i < 100; i++) {
chainPromise.then(() => {value = false;});
}
chainPromise.then(() => {
value = true;
});
expect(value).to.be.undefined;
yield macroTask();
expect(value).to.be.true;
});
it('should work with promise inside setTimeout', function* () {
let value;
win.setTimeout(() => {
value = false;
Promise.resolve().then(() => {
value = true;
});
}, 100);
expect(value).to.be.undefined;
clock.tick(100);
expect(value).to.be.false;
yield macroTask();
expect(value).to.be.true;
});
it('should work with manually resolved promise inside ' +
'setTimeout', function* () {
let value;
let resolver;
const promise = new Promise(r => {resolver = r;});
promise.then(() => {
value = true;
});
win.setTimeout(() => {
value = false;
resolver();
}, 100);
clock.tick(100);
expect(value).to.be.false;
yield macroTask();
expect(value).to.be.true;
});
it('should block a promise', function* () {
let resolver;
const promise = new Promise(r => {resolver = r;}).then(() => 'yes');
resolver();
const result = yield promise;
expect(result).to.equal('yes');
});
it('should be able to expect throwable', function* () {
const promiseThatRejects = Promise.reject(new Error('OMG'));
try {
yield promiseThatRejects;
throw new Error('UNREACHABLE');
} catch (e) {
expect(e.message).to.contain('OMG');
}
});
});