pdfjs-dist/lib/test/unit/ui_utils_spec.js

/* Copyright 2017 Mozilla Foundation
 *
 * 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.
 */
'use strict';

var webUiUtils = require('../../web/ui_utils.js');
var binarySearchFirstItem = webUiUtils.binarySearchFirstItem;
var EventBus = webUiUtils.EventBus;
describe('ui_utils', function () {
  describe('binary search', function () {
    function isTrue(boolean) {
      return boolean;
    }
    function isGreater3(number) {
      return number > 3;
    }
    it('empty array', function () {
      expect(binarySearchFirstItem([], isTrue)).toEqual(0);
    });
    it('single boolean entry', function () {
      expect(binarySearchFirstItem([false], isTrue)).toEqual(1);
      expect(binarySearchFirstItem([true], isTrue)).toEqual(0);
    });
    it('three boolean entries', function () {
      expect(binarySearchFirstItem([true, true, true], isTrue)).toEqual(0);
      expect(binarySearchFirstItem([false, true, true], isTrue)).toEqual(1);
      expect(binarySearchFirstItem([false, false, true], isTrue)).toEqual(2);
      expect(binarySearchFirstItem([false, false, false], isTrue)).toEqual(3);
    });
    it('three numeric entries', function () {
      expect(binarySearchFirstItem([0, 1, 2], isGreater3)).toEqual(3);
      expect(binarySearchFirstItem([2, 3, 4], isGreater3)).toEqual(2);
      expect(binarySearchFirstItem([4, 5, 6], isGreater3)).toEqual(0);
    });
  });
  describe('EventBus', function () {
    it('dispatch event', function () {
      var eventBus = new EventBus();
      var count = 0;
      eventBus.on('test', function () {
        count++;
      });
      eventBus.dispatch('test');
      expect(count).toEqual(1);
    });
    it('dispatch different event', function () {
      var eventBus = new EventBus();
      var count = 0;
      eventBus.on('test', function () {
        count++;
      });
      eventBus.dispatch('nottest');
      expect(count).toEqual(0);
    });
    it('dispatch event multiple times', function () {
      var eventBus = new EventBus();
      var count = 0;
      eventBus.dispatch('test');
      eventBus.on('test', function () {
        count++;
      });
      eventBus.dispatch('test');
      eventBus.dispatch('test');
      expect(count).toEqual(2);
    });
    it('dispatch event to multiple handlers', function () {
      var eventBus = new EventBus();
      var count = 0;
      eventBus.on('test', function () {
        count++;
      });
      eventBus.on('test', function () {
        count++;
      });
      eventBus.dispatch('test');
      expect(count).toEqual(2);
    });
    it('dispatch to detached', function () {
      var eventBus = new EventBus();
      var count = 0;
      var listener = function listener() {
        count++;
      };
      eventBus.on('test', listener);
      eventBus.dispatch('test');
      eventBus.off('test', listener);
      eventBus.dispatch('test');
      expect(count).toEqual(1);
    });
    it('dispatch to wrong detached', function () {
      var eventBus = new EventBus();
      var count = 0;
      eventBus.on('test', function () {
        count++;
      });
      eventBus.dispatch('test');
      eventBus.off('test', function () {
        count++;
      });
      eventBus.dispatch('test');
      expect(count).toEqual(2);
    });
    it('dispatch to detached during handling', function () {
      var eventBus = new EventBus();
      var count = 0;
      var listener1 = function listener1() {
        eventBus.off('test', listener2);
        count++;
      };
      var listener2 = function listener2() {
        eventBus.off('test', listener1);
        count++;
      };
      eventBus.on('test', listener1);
      eventBus.on('test', listener2);
      eventBus.dispatch('test');
      eventBus.dispatch('test');
      expect(count).toEqual(2);
    });
  });
});