text: /**
   * 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 {Signals} from '../../../src/utils/signals';
  
  
  describes.sandboxed('Signals', {}, () => {
    let clock;
    let signals;
  
    beforeEach(() => {
      clock = sandbox.useFakeTimers();
      clock.tick(1);
      signals = new Signals();
    });
  
    it('should register signal without promise', () => {
      signals.signal('sig');
      expect(signals.get('sig')).to.equal(1);
      expect(signals.promiseMap_).to.be.null;
    });
  
    it('should reject signal without promise', () => {
      const error = new Error();
      signals.rejectSignal('sig', error);
      expect(signals.get('sig')).to.equal(error);
      expect(signals.promiseMap_).to.be.null;
    });
  
    it('should not duplicate signal', () => {
      signals.signal('sig', 11);
      expect(signals.map_['sig']).to.equal(11);
  
      signals.signal('sig', 12);
      expect(signals.map_['sig']).to.equal(11);  // Did not change.
  
      signals.rejectSignal('sig', new Error());
      expect(signals.map_['sig']).to.equal(11);  // Did not change.
    });
  
    it('should override signal time', () => {
      signals.signal('sig', 11);
      expect(signals.map_['sig']).to.equal(11);
      expect(signals.promiseMap_).to.be.null;
    });
  
    it('should resolve signal after it was requested', () => {
      const promise = signals.whenSignal('sig');
      expect(signals.promiseMap_['sig'].promise).to.equal(promise);
      expect(signals.promiseMap_['sig'].resolve).to.be.ok;
      expect(signals.promiseMap_['sig'].reject).to.be.ok;
      expect(signals.whenSignal('sig')).to.equal(promise);  // Reuse promise.
      signals.signal('sig', 11);
      return promise.then(time => {
        expect(time).to.equal(11);
        expect(signals.promiseMap_['sig'].promise).to.equal(promise);
        expect(signals.promiseMap_['sig'].resolve).to.be.undefined;
        expect(signals.promiseMap_['sig'].reject).to.be.undefined;
        expect(signals.whenSignal('sig')).to.equal(promise);  // Reuse promise.
      });
    });
  
    it('should resolve signal before it was requested', () => {
      signals.signal('sig', 11);
      const promise = signals.whenSignal('sig');
      expect(signals.promiseMap_['sig'].promise).to.equal(promise);
      expect(signals.promiseMap_['sig'].resolve).to.be.undefined;
      expect(signals.promiseMap_['sig'].reject).to.be.undefined;
      expect(signals.whenSignal('sig')).to.equal(promise);  // Reuse promise.
      return promise.then(time => {
        expect(time).to.equal(11);
        expect(signals.promiseMap_['sig'].promise).to.equal(promise);
        expect(signals.promiseMap_['sig'].resolve).to.be.undefined;
        expect(signals.promiseMap_['sig'].reject).to.be.undefined;
        expect(signals.whenSignal('sig')).to.equal(promise);  // Reuse promise.
      });
    });
  
    it('should reject signal after it was requested', () => {
      const promise = signals.whenSignal('sig');
      expect(signals.promiseMap_['sig'].promise).to.equal(promise);
      const error = new Error();
      signals.rejectSignal('sig', error);
      return promise.then(() => {
        throw new Error('should have failed');
      }, reason => {
        expect(reason).to.equal(error);
        expect(signals.promiseMap_['sig'].promise).to.equal(promise);
        expect(signals.promiseMap_['sig'].resolve).to.be.undefined;
        expect(signals.promiseMap_['sig'].reject).to.be.undefined;
        expect(signals.whenSignal('sig')).to.equal(promise);  // Reuse promise.
      });
    });
  
    it('should reject signal before it was requested', () => {
      const error = new Error();
      signals.rejectSignal('sig', error);
      const promise = signals.whenSignal('sig');
      expect(signals.promiseMap_['sig'].promise).to.equal(promise);
      return promise.then(() => {
        throw new Error('should have failed');
      }, reason => {
        expect(reason).to.equal(error);
        expect(signals.promiseMap_['sig'].promise).to.equal(promise);
        expect(signals.promiseMap_['sig'].resolve).to.be.undefined;
        expect(signals.promiseMap_['sig'].reject).to.be.undefined;
        expect(signals.whenSignal('sig')).to.equal(promise);  // Reuse promise.
      });
    });
  
    it('should reset signal before it was triggered', () => {
      signals.reset('sig');
      expect(signals.get('sig')).to.be.null;
      expect(signals.promiseMap_).to.be.null;
    });
  
    it('should reset signal after it was triggered', () => {
      signals.signal('sig');
      expect(signals.get('sig')).to.be.ok;
  
      signals.reset('sig');
      expect(signals.get('sig')).to.be.null;
      expect(signals.promiseMap_).to.be.null;
    });
  
    it('should reset signal after it was requested', () => {
      signals.whenSignal('sig');
      const iniPromise = signals.promiseMap_['sig'].promise;
      expect(iniPromise).to.be.ok;
  
      signals.reset('sig');
      // Promise has not changed.
      expect(signals.promiseMap_['sig'].promise).to.equal(iniPromise);
      expect(signals.promiseMap_['sig'].resolve).to.be.ok;
    });
  
    it('should reset signal after it was resolved', () => {
      signals.whenSignal('sig');
      signals.signal('sig');
      const iniPromise = signals.promiseMap_['sig'].promise;
      expect(iniPromise).to.be.ok;
      expect(signals.promiseMap_['sig'].resolve).to.be.undefined;
  
      signals.reset('sig');
      // Promise has been reset completely.
      expect(signals.promiseMap_['sig']).to.be.undefined;
    });
  
    it('should reset a pre-resolved signal', () => {
      signals.signal('sig');
      signals.whenSignal('sig');
      const iniPromise = signals.promiseMap_['sig'].promise;
      expect(iniPromise).to.be.ok;
      expect(signals.promiseMap_['sig'].resolve).to.be.undefined;
  
      signals.reset('sig');
      // Promise has been reset completely.
      expect(signals.promiseMap_['sig']).to.be.undefined;
    });
  });
  