/**

* @license

* Copyright 2018 Google Inc. 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 tf from './index';

import {ALL_ENVS, describeWithFlags} from './jasmine_util';

describeWithFlags('nextFrame', ALL_ENVS, () => {

it('basic usage', async () => {

const t0 = tf.util.now();

await tf.nextFrame();

const t1 = tf.util.now();

// tf.util.now should give sufficient accuracy on all supported envs.

expect(t1 > t0);

});

it('does not block timers', async () => {

let flag = false;

setTimeout(() => {

flag = true;

}, 50);

const t0 = tf.util.now();

expect(flag).toBe(false);

while (tf.util.now() - t0 < 1000 && !flag) {

await tf.nextFrame();

}

expect(flag).toBe(true);

});

});