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 () {
    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 () {
    eventBus.off('test', listener2);
    count++;
   };
   var listener2 = function () {
    eventBus.off('test', listener1);
    count++;
   };
   eventBus.on('test', listener1);
   eventBus.on('test', listener2);
   eventBus.dispatch('test');
   eventBus.dispatch('test');
   expect(count).toEqual(2);
  });
 });
});