chrome/test/data/pdf/zoom_manager_test.js

   1 // Copyright 2015 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 chrome.test.runTests(function() {
   6   'use strict';
   7
   8   class MockViewport {
   9     constructor() {
  10       this.zooms = [];
  11       this.zoom = 1;
  12     }
  13
  14     setZoom(zoom) {
  15       this.zooms.push(zoom);
  16       this.zoom = zoom;
  17     }
  18   }
  19
  20   /**
  21    * A mock implementation of the function used by ZoomManager to set the
  22    * browser zoom level.
  23    */
  24   class MockBrowserZoomSetter {
  25     constructor() {
  26       this.zoom = 1;
  27       this.started = false;
  28     }
  29
  30     /**
  31      * The function implementing setBrowserZoomFunction.
  32      */
  33     setBrowserZoom(zoom) {
  34       chrome.test.assertFalse(this.started);
  35
  36       this.zoom = zoom;
  37       this.started = true;
  38       return new Promise(function(resolve, reject) {
  39         this.resolve_ = resolve;
  40       }.bind(this));
  41     }
  42
  43     /**
  44      * Resolves the promise returned by a call to setBrowserZoom.
  45      */
  46     complete() {
  47       this.resolve_();
  48       this.started = false;
  49     }
  50   };
  51
  52   return [
  53     function testZoomChange() {
  54       let viewport = new MockViewport();
  55       let browserZoomSetter = new MockBrowserZoomSetter();
  56       let zoomManager = new ZoomManager(
  57           viewport, browserZoomSetter.setBrowserZoom.bind(browserZoomSetter),
  58           1);
  59       viewport.zoom = 2;
  60       zoomManager.onPdfZoomChange();
  61       chrome.test.assertEq(2, browserZoomSetter.zoom);
  62       chrome.test.assertTrue(browserZoomSetter.started);
  63       chrome.test.succeed();
  64     },
  65
  66     function testBrowserZoomChange() {
  67       let viewport = new MockViewport();
  68       let zoomManager = new ZoomManager(viewport, chrome.test.fail, 1);
  69       zoomManager.onBrowserZoomChange(3);
  70       chrome.test.assertEq(1, viewport.zooms.length);
  71       chrome.test.assertEq(3, viewport.zooms[0]);
  72       chrome.test.assertEq(3, viewport.zoom);
  73       chrome.test.succeed();
  74     },
  75
  76     function testSmallZoomChange() {
  77       let viewport = new MockViewport();
  78       let browserZoomSetter = new MockBrowserZoomSetter();
  79       let zoomManager = new ZoomManager(
  80           viewport, browserZoomSetter.setBrowserZoom.bind(browserZoomSetter),
  81           2);
  82       viewport.zoom = 2.0001;
  83       zoomManager.onPdfZoomChange();
  84       chrome.test.assertEq(1, browserZoomSetter.zoom);
  85       chrome.test.assertFalse(browserZoomSetter.started);
  86       chrome.test.succeed();
  87     },
  88
  89     function testSmallBrowserZoomChange() {
  90       let viewport = new MockViewport();
  91       let zoomManager = new ZoomManager(viewport, chrome.test.fail, 1);
  92       zoomManager.onBrowserZoomChange(0.999);
  93       chrome.test.assertEq(0, viewport.zooms.length);
  94       chrome.test.assertEq(1, viewport.zoom);
  95       chrome.test.succeed();
  96     },
  97
  98     function testMultiplePdfZoomChanges() {
  99       let viewport = new MockViewport();
 100       let browserZoomSetter = new MockBrowserZoomSetter();
 101       let zoomManager = new ZoomManager(
 102           viewport, browserZoomSetter.setBrowserZoom.bind(browserZoomSetter),
 103           1);
 104       viewport.zoom = 2;
 105       zoomManager.onPdfZoomChange();
 106       viewport.zoom = 3;
 107       zoomManager.onPdfZoomChange();
 108       chrome.test.assertTrue(browserZoomSetter.started);
 109       chrome.test.assertEq(2, browserZoomSetter.zoom);
 110       browserZoomSetter.complete();
 111       Promise.resolve().then(function() {
 112         chrome.test.assertTrue(browserZoomSetter.started);
 113         chrome.test.assertEq(3, browserZoomSetter.zoom);
 114         chrome.test.succeed();
 115       });
 116     },
 117
 118     function testMultipleBrowserZoomChanges() {
 119       let viewport = new MockViewport();
 120       let zoomManager = new ZoomManager(viewport, chrome.test.fail, 1);
 121       zoomManager.onBrowserZoomChange(2);
 122       zoomManager.onBrowserZoomChange(3);
 123       chrome.test.assertEq(2, viewport.zooms.length);
 124       chrome.test.assertEq(2, viewport.zooms[0]);
 125       chrome.test.assertEq(3, viewport.zooms[1]);
 126       chrome.test.assertEq(3, viewport.zoom);
 127       chrome.test.succeed();
 128     },
 129   ];
 130 }());