chrome/browser/resources/chromeos/chromevox/braille/pan_strategy_test.unitjs

// Copyright 2015 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

GEN_INCLUDE(['../testing/chromevox_unittest_base.js']);

/**
 * Test fixture.
 * @constructor
 * @extends {ChromeVoxUnitTestBase}
 */
function CvoxPanStrategyUnitTest() {}

CvoxPanStrategyUnitTest.prototype = {
  __proto__: ChromeVoxUnitTestBase.prototype,

  /** @override */
  closureModuleDeps: [
    'cvox.PanStrategy',
  ],
};

/**
 * @param {string} content String representing the content with spaces
 *     representing blank cells and any other character representing
 *     arbitrary non-blank cells.
 */
function createArrayBuffer(content) {
  var result = new ArrayBuffer(content.length);
  var view = new Uint8Array(result);
  for (var i = 0; i < content.length; ++i) {
    view[i] = (content[i] != ' ' ? 1 : 0);
  }
  return result;
}

 TEST_F('CvoxPanStrategyUnitTest', 'FixedPanning', function() {
  var panner = new cvox.FixedPanStrategy();

  panner.setDisplaySize(0);
  panner.setContent(createArrayBuffer(''), 0);
  assertEqualsJSON({start: 0, end: 0}, panner.viewPort);
  assertFalse(panner.previous());
  assertFalse(panner.next());

  // 25 cells with a blank cell in the first 10 characters.
  var content = createArrayBuffer('01234567 9012345678901234');
  panner.setContent(content, 0);
  assertEqualsJSON({start: 0, end: 0}, panner.viewPort);
  assertFalse(panner.next());
  assertFalse(panner.previous());

  panner.setDisplaySize(10);
  assertEqualsJSON({start: 0, end: 10}, panner.viewPort);
  assertTrue(panner.next());
  assertEqualsJSON({start: 10, end: 20}, panner.viewPort);
  assertTrue(panner.next());
  assertEqualsJSON({start: 20, end: 25}, panner.viewPort);
  assertFalse(panner.next());
  assertEqualsJSON({start: 20, end: 25}, panner.viewPort);
  assertTrue(panner.previous());
  assertEqualsJSON({start: 10, end: 20}, panner.viewPort);
  assertTrue(panner.previous());
  assertEqualsJSON({start: 0, end: 10}, panner.viewPort);

  panner.setContent(content, 19);
  assertEqualsJSON({start: 10, end: 20}, panner.viewPort);

  panner.setContent(content, 20);
  assertEqualsJSON({start: 20, end: 25}, panner.viewPort);

  panner.setDisplaySize(8);
  assertEqualsJSON({start: 16, end: 24}, panner.viewPort);

  panner.viewPort_ = {start: 2, end: 10};
  assertTrue(panner.previous());
  assertEqualsJSON({start: 0, end: 8}, panner.viewPort);
});

TEST_F('CvoxPanStrategyUnitTest', 'WrappedPanning', function() {
  var panner = new cvox.WrappingPanStrategy();

  // 30 cells with blank cells at positions 8, 22 and 26.
  var content = createArrayBuffer('01234567 9012345678901 345 789');
  panner.setContent(content, 0);
  assertEqualsJSON({start: 0, end: 0}, panner.viewPort);
  assertFalse(panner.next());
  assertFalse(panner.previous());

  panner.setDisplaySize(10);
  assertEqualsJSON({start: 0, end: 9}, panner.viewPort);
  assertTrue(panner.next());
  assertEqualsJSON({start: 9, end: 19}, panner.viewPort);
  assertTrue(panner.next());
  assertEqualsJSON({start: 19, end: 27}, panner.viewPort);
  assertTrue(panner.next());
  assertEqualsJSON({start: 27, end: 30}, panner.viewPort);
  assertFalse(panner.next());
  assertEqualsJSON({start: 27, end: 30}, panner.viewPort);
  assertTrue(panner.previous());
  assertEqualsJSON({start: 23, end: 27}, panner.viewPort);
  assertTrue(panner.previous());
  assertEqualsJSON({start: 13, end: 23}, panner.viewPort);
  assertTrue(panner.previous());
  assertEqualsJSON({start: 9, end: 13}, panner.viewPort);
  assertTrue(panner.previous());
  assertEqualsJSON({start: 0, end: 9}, panner.viewPort);

  panner.setContent(content, 21);
  assertEqualsJSON({start: 19, end: 27}, panner.viewPort);

  panner.setContent(content, 30);
  assertEqualsJSON({start: 27, end: 30}, panner.viewPort);

  panner.setDisplaySize(8);
  assertEqualsJSON({start: 23, end: 30}, panner.viewPort);

  panner.viewPort_ = {start: 2, end: 10};
  assertTrue(panner.previous());
  assertEqualsJSON({start: 0, end: 8}, panner.viewPort);
});