Port braille related tests from ChromeVox upstream.

chrome/browser/resources/chromeos/chromevox/host/chrome/braille_input_handler_test.unitjs

Index: chrome/browser/resources/chromeos/chromevox/host/chrome/braille_input_handler_test.unitjs
diff --git a/chrome/browser/resources/chromeos/chromevox/host/chrome/braille_input_handler_test.unitjs b/chrome/browser/resources/chromeos/chromevox/host/chrome/braille_input_handler_test.unitjs
new file mode 100644
index 0000000000000000000000000000000000000000..d6dca7224810c8c82561a58e6091e46d87e6d1e3
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+++ b/chrome/browser/resources/chromeos/chromevox/host/chrome/braille_input_handler_test.unitjs
@@ -0,0 +1,613 @@
+// Copyright 2014 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.
+
+// Include test fixture.
+GEN_INCLUDE(['../../testing/chromevox_unittest_base.js']);
+
+GEN_INCLUDE(['../../testing/fake_objects.js']);
+
+// Fake out the Chrome API namespace we depend on.
+var chrome = {};
+/** Fake chrome.runtime object. */
+chrome.runtime = {};
+/** Fake chrome.virtualKeyboardPrivate object. */
+chrome.virtualKeyboardPrivate = {};
+
+
+/**
+ * A fake input field that behaves like the Braille IME and also updates
+ * the input manager's knowledge about the display content when text changes
+ * in the edit field.
+ * @param {FakePort} port A fake port.
+ * @param {cvox.BrailleInputHandler} inputHandler to work with.
+ * @constructor
+ */
+function FakeEditor(port, inputHandler) {
+  /** @private {FakePort} */
+  this.port_ = port;
+  /** @private {cvox.BrailleInputHandler} */
+  this.inputHandler_ = inputHandler;
+  /** @private {string} */
+  this.text_ = '';
+  /** @private {number} */
+  this.selectionStart_ = 0;
+  /** @private {number} */
+  this.selectionEnd_ = 0;
+  /** @private {number} */
+  this.contextID_ = 0;
+  /** @private {boolean} */
+  this.allowDeletes_ = false;
+  port.postMessage = goog.bind(this.handleMessage_, this);
+}
+
+
+/**
+ * Sets the content and selection (or cursor) of the edit field.
+ * This fakes what happens when the field is edited by other means than
+ * via the braille keyboard.
+ * @param {string} text Text to replace the current content of the field.
+ * @param {number} selectionStart Start of the selection or cursor position.
+ * @param {number=} opt_selectionEnd End of selection, or ommited if the
+ *     selection is a cursor.
+ */
+FakeEditor.prototype.setContent = function(
+    text, selectionStart, opt_selectionEnd) {
+  this.text_ = text;
+  this.selectionStart_ = selectionStart;
+  this.selectionEnd_ = goog.isDef(opt_selectionEnd) ?
+      opt_selectionEnd : selectionStart;
+  this.callOnDisplayContentChanged_();
+};
+
+
+/**
+ * Sets the selection in the editor.
+ * @param {number} selectionStart Start of the selection or cursor position.
+ * @param {number=} opt_selectionEnd End of selection, or ommited if the
+ *     selection is a cursor.
+ */
+FakeEditor.prototype.select = function(selectionStart, opt_selectionEnd) {
+  this.setContent(this.text_, selectionStart, opt_selectionEnd);
+};
+
+
+/**
+ * Inserts text into the edit field, optionally selecting the inserted
+ * text.
+ * @param {string} newText Text to insert.
+ * @param {boolean=} opt_select If {@code true}, selects the inserted text,
+ *     otherwise leaves the cursor at the end of the new text.
+ */
+FakeEditor.prototype.insert = function(newText, opt_select) {
+  this.text_ =
+      this.text_.substring(0, this.selectionStart_) +
+      newText +
+      this.text_.substring(this.selectionEnd_);
+  if (opt_select) {
+    this.selectionEnd_ = this.selectionStart_ + newText.length;
+  } else {
+    this.selectionStart_ += newText.length;
+    this.selectionEnd_ = this.selectionStart_;
+  }
+  this.callOnDisplayContentChanged_();
+};
+
+
+/**
+ * Sets whether the editor should cause a test failure if the input handler
+ * tries to delete text before the cursor.  By default, thi value is
+ * {@code false}.
+ * @param {boolean} allowDeletes The new value.
+ */
+FakeEditor.prototype.setAllowDeletes = function(allowDeletes) {
+  this.allowDeletes_ = allowDeletes;
+};
+
+
+/**
+ * Signals to the input handler that the Braille IME is active or not active,
+ * depending on the argument.
+ * @param {boolean} value Whether the IME is active or not.
+ */
+FakeEditor.prototype.setActive = function(value) {
+  this.message_({type: 'activeState', active: value});
+};
+
+
+/**
+ * Fails if the current editor content and selection range don't match
+ * the arguments to this function.
+ * @param {string} text Text that should be in the field.
+ * @param {number} selectionStart Start of selection.
+ * @param {number+} opt_selectionEnd End of selection, default to selection
+ *     start to indicate a cursor.
+ */
+FakeEditor.prototype.assertContentIs = function(
+    text, selectionStart, opt_selectionEnd) {
+  var selectionEnd = goog.isDef(opt_selectionEnd) ? opt_selectionEnd :
+      selectionStart;
+  assertEquals(text, this.text_);
+  assertEquals(selectionStart, this.selectionStart_);
+  assertEquals(selectionEnd, this.selectionEnd_);
+};
+
+
+/**
+ * Sends a message from the IME to the input handler.
+ * @param {Object} msg The message to send.
+ * @private
+ */
+FakeEditor.prototype.message_ = function(msg) {
+  var listener = this.port_.onMessage.getListener();
+  assertNotEquals(null, listener);
+  listener(msg);
+};
+
+
+/**
+ * Calls the {@code onDisplayContentChanged} method of the input handler
+ * with the current editor content and selection.
+ * @private
+ */
+FakeEditor.prototype.callOnDisplayContentChanged_ = function() {
+  this.inputHandler_.onDisplayContentChanged(
+      cvox.BrailleUtil.createValue(
+          this.text_, this.selectionStart_, this.selectionEnd_));
+};
+
+
+/**
+ * Informs the input handler that a new text field is focused.  The content
+ * of the field is not cleared and should be updated separately.
+ * @param {string} fieldType The type of the field (see the documentation
+ *     for the {@code chrome.input.ime} API).
+ */
+FakeEditor.prototype.focus = function(fieldType) {
+  this.contextID_++;
+  this.message_({type: 'inputContext',
+                 context: {type: fieldType,
+                           contextID: this.contextID_}});
+};
+
+
+/**
+ * Inform the input handler that focus left the input field.
+ */
+FakeEditor.prototype.blur = function() {
+  this.message_({type: 'inputContext', context: null});
+  this.contextID_ = 0;
+};
+
+
+/**
+ * Handles a message from the input handler to the IME.
+ * @param {Object} msg The message.
+ * @private
+ */
+FakeEditor.prototype.handleMessage_ = function(msg) {
+  assertEquals('replaceText', msg.type);
+  assertEquals(this.contextID_, msg.contextID);
+  var deleteBefore = msg.deleteBefore;
+  var newText = msg.newText;
+  assertTrue(goog.isNumber(deleteBefore));
+  assertTrue(goog.isString(newText));
+  assertTrue(deleteBefore <= this.selectionStart_);
+  if (deleteBefore > 0) {
+    assertTrue(this.allowDeletes_);
+    this.text_ =
+        this.text_.substring(0, this.selectionStart_ - deleteBefore) +
+        this.text_.substring(this.selectionEnd_);
+    this.selectionStart_ -= deleteBefore;
+    this.selectionEnd_ = this.selectionStart_;
+    this.callOnDisplayContentChanged_();
+  }
+  this.insert(newText);
+};
+
+/*
+ * Fakes a {@code Port} used for message passing in the Chrome extension APIs.
+ * @constructor
+ */
+function FakePort() {
+  /** @type {FakeChromeEvent} */
+  this.onDisconnect = new FakeChromeEvent();
+  /** @type {FakeChromeEvent} */
+  this.onMessage = new FakeChromeEvent();
+  /** @type {string} */
+  this.name = cvox.BrailleInputHandler.IME_PORT_NAME_;
+  /** @type {{id: string}} */
+  this.sender = {id: cvox.BrailleInputHandler.IME_EXTENSION_ID_};
+}
+
+/**
+ * Mapping from braille cells to Unicode characters.
+ * @const Array.<Array.<string> >
+ */
+var UNCONTRACTED_TABLE = [
+  ['0', ' '],
+  ['1', 'a'], ['12', 'b'], ['14', 'c'], ['145', 'd'], ['15', 'e'],
+  ['124', 'f'], ['1245', 'g'], ['125', 'h'], ['24', 'i'], ['245', 'j'],
+  ['13', 'k'], ['123', 'l'], ['134', 'm'], ['1345', 'n'], ['135', 'o'],
+  ['1234', 'p'], ['12345', 'q'], ['1235', 'r'], ['234', 's'], ['2345', 't']
+];
+
+
+/**
+ * Mapping of braille cells to the corresponding word in Grade 2 US English
+ * braille.  This table also includes the uncontracted table above.
+ * If a match 'pattern' starts with '^', it must be at the beginning of
+ * the string or be preceded by a blank cell.  Similarly, '$' at the end
+ * of a 'pattern' means that the match must be at the end of the string
+ * or be followed by a blank cell.  Note that order is significant in the
+ * table.  First match wins.
+ * @const
+ */
+var CONTRACTED_TABLE = [
+  ['12 1235 123', 'braille'],
+  ['^12$', 'but'],
+  ['1456', 'this']].concat(UNCONTRACTED_TABLE);
+
+/**
+ * A fake braille translator that can do back translation according
+ * to one of the tables above.
+ * @param {Array.<Array.<number>>} table Backtranslation mapping.
+ * @param {boolean=} opt_capitalize Whether the result should be capitalized.
+ * @constructor
+ */
+function FakeTranslator(table, opt_capitalize) {
+  /** @private */
+  this.table_ = table.map(function(entry) {
+    var cells = entry[0];
+    var result = [];
+    if (cells[0] === '^') {
+      result.start = true;
+      cells = cells.substring(1);
+    }
+    if (cells[cells.length - 1] === '$') {
+      result.end = true;
+      cells = cells.substring(0, cells.length - 1);
+    }
+    result[0] = cellsToArray(cells);
+    result[1] = entry[1];
+    return result;
+  });
+  /** @private {boolean} */
+  this.capitalize_ = opt_capitalize || false;
+}
+
+
+/**
+ * Implements the {@code cvox.LibLouis.BrailleTranslator.backTranslate} method.
+ * @param {!ArrayBuffer} cells Cells to be translated.
+ * @param {function(?string)} callback Callback for result.
+ */
+FakeTranslator.prototype.backTranslate = function(cells, callback) {
+  var cellsArray = new Uint8Array(cells);
+  var result = '';
+  var pos = 0;
+  while (pos < cellsArray.length) {
+    var match = null;
+    outer: for (var i = 0, entry; entry = this.table_[i]; ++i) {
+      if (pos + entry[0].length > cellsArray.length) {
+        continue;
+      }
+      if (entry.start && pos > 0 && cellsArray[pos - 1] !== 0) {
+        continue;
+      }
+      for (var j = 0; j < entry[0].length; ++j) {
+        if (entry[0][j] !== cellsArray[pos + j]) {
+          continue outer;
+        }
+      }
+      if (entry.end && pos + j < cellsArray.length &&
+          cellsArray[pos + j] !== 0) {
+        continue;
+      }
+      match = entry;
+      break;
+    }
+    assertNotEquals(
+        null, match,
+        'Backtranslating ' + cellsArray[pos] + ' at ' + pos);
+    result += match[1];
+    pos += match[0].length;
+  }
+  if (this.capitalize_) {
+    result = result.toUpperCase();
+  }
+  callback(result);
+};
+
+/**
+ * Converts a list of cells, represented as a string, to an array.
+ * @param {string} cells A string with space separated groups of digits.
+ *     Each group corresponds to one braille cell and each digit in a group
+ *     corresponds to a particular dot in the cell (1 to 8).  As a special
+ *     case, the digit 0 by itself represents a blank cell.
+ * @return {Array.<number>} An array with each cell encoded as a bit
+ *     pattern (dot 1 uses bit 0, etc).
+ */
+function cellsToArray(cells) {
+  return cells.split(/\s+/).map(function(cellString) {
+    var cell = 0;
+    assertTrue(cellString.length > 0);
+    if (cellString != '0') {
+      for (var i = 0; i < cellString.length; ++i) {
+        var dot = cellString.charCodeAt(i) - '0'.charCodeAt(0);
+        assertTrue(dot >= 1);
+        assertTrue(dot <= 8);
+        cell |= 1 << (dot - 1);
+      }
+    }
+    return cell;
+  });
+}
+
+/**
+ * Test fixture.
+ * @constructor
+ * @extends {ChromeVoxUnitTestBase}
+ */
+function CvoxBrailleInputHandlerUnitTest() {}
+
+CvoxBrailleInputHandlerUnitTest.prototype = {
+  __proto__: ChromeVoxUnitTestBase.prototype,
+
+  /** @override */
+  closureModuleDeps: [
+    'cvox.BrailleInputHandler',
+    'cvox.BrailleUtil',
+    'cvox.Spannable',
+  ],
+
+  /**
+   * Creates an editor and establishes a connection from the IME.
+   * @return {FakeEditor}
+   */
+  createEditor: function() {
+    chrome.runtime.onConnectExternal.getListener()(this.port);
+    return new FakeEditor(this.port, this.inputHandler);
+  },
+
+  /**
+   * Sends a series of braille cells to the input handler.
+   * @param {string} cells Braille cells, encoded as described in
+   *     {@code cellsToArray}.
+   * @return {boolean} {@code true} iff all cells were sent successfully.
+   */
+  sendCells: function(cells) {
+    return cellsToArray(cells).reduce(function(prevResult, cell) {
+      var event = {command: cvox.BrailleKeyCommand.DOTS, brailleDots: cell};
+      return prevResult && this.inputHandler.onBrailleKeyEvent(event);
+    }.bind(this), true);
+  },
+
+  /**
+   * Sends a standard key event (such as backspace) to the braille input
+   * handler.
+   * @param {string} keyCode The key code name.
+   * @return {boolean} Whether the event was handled.
+   */
+  sendKeyEvent: function(keyCode) {
+    var event = {command: cvox.BrailleKeyCommand.STANDARD_KEY,
+                 standardKeyCode: keyCode};
+    return this.inputHandler.onBrailleKeyEvent(event);
+  },
+
+  /**
+   * Shortcut for asserting that the value expansion mode is {@code NONE}.
+   */
+  assertExpandingNone: function() {
+    assertEquals(cvox.ExpandingBrailleTranslator.ExpansionType.NONE,
+                 this.inputHandler.getExpansionType());
+  },
+
+  /**
+   * Shortcut for asserting that the value expansion mode is {@code SELECTION}.
+   */
+  assertExpandingSelection: function() {
+    assertEquals(cvox.ExpandingBrailleTranslator.ExpansionType.SELECTION,
+                 this.inputHandler.getExpansionType());
+  },
+
+  /**
+   * Shortcut for asserting that the value expansion mode is {@code ALL}.
+   */
+  assertExpandingAll: function() {
+    assertEquals(cvox.ExpandingBrailleTranslator.ExpansionType.ALL,
+                 this.inputHandler.getExpansionType());
+  },
+
+  storeKeyEvent: function(event, opt_callback) {
+    var storedCopy = {keyCode: event.keyCode, keyName: event.keyName,
+                      charValue: event.charValue};
+    if (event.type == 'keydown') {
+      this.keyEvents.push(storedCopy);
+    } else {
+      assertEquals('keyup', event.type);
+      assertTrue(this.keyEvents.length > 0);
+      assertEqualsJSON(storedCopy, this.keyEvents[this.keyEvents.length - 1]);
+    }
+    if (goog.isDef(opt_callback)) {
+      callback();
+    }
+  },
+
+  /** @override */
+  setUp: function() {
+    chrome.runtime.onConnectExternal = new FakeChromeEvent();
+    this.port = new FakePort();
+    this.inputHandler = new cvox.BrailleInputHandler();
+    this.inputHandler.init();
+    this.uncontractedTranslator = new FakeTranslator(UNCONTRACTED_TABLE);
+    this.contractedTranslator = new FakeTranslator(CONTRACTED_TABLE, true);
+    chrome.virtualKeyboardPrivate.sendKeyEvent =
+      this.storeKeyEvent.bind(this);
+    this.keyEvents = [];
+  }
+};
+
+TEST_F('CvoxBrailleInputHandlerUnitTest', 'ConnectFromUnknownExtension',
+  function() {
+  this.port.sender.id = 'your unknown friend';
+  chrome.runtime.onConnectExternal.getListener()(this.port);
+  this.port.onMessage.assertNoListener();
+});
+
+
+TEST_F('CvoxBrailleInputHandlerUnitTest', 'NoTranslator', function() {
+  var editor = this.createEditor();
+  editor.setContent('blah', 0);
+  editor.setActive(true);
+  editor.focus('email');
+  assertFalse(this.sendCells('145 135 125'));
+  editor.setActive(false);
+  editor.blur();
+  editor.assertContentIs('blah', 0);
+});
+
+
+TEST_F('CvoxBrailleInputHandlerUnitTest', 'InputUncontracted', function() {
+  this.inputHandler.setTranslator(this.uncontractedTranslator);
+  var editor = this.createEditor();
+  editor.setActive(true);
+
+  // Focus and type in a text field.
+  editor.focus('text');
+  assertTrue(this.sendCells('125 15 123 123 135'));  // hello
+  editor.assertContentIs('hello', 'hello'.length);
+  this.assertExpandingNone();
+
+  // Move the cursor and type in the middle.
+  editor.select(2);
+  assertTrue(this.sendCells('0 2345 125 15 1235 15 0'));  // ' there '
+  editor.assertContentIs('he there llo', 'he there '.length);
+
+  // Field changes by some other means.
+  editor.insert('you!');
+  // Then type on the braille keyboard again.
+  assertTrue(this.sendCells('0 125 15'));  // ' he'
+  editor.assertContentIs('he there you! hello', 'he there you! he'.length);
+
+  editor.blur();
+  editor.setActive(false);
+});
+
+
+TEST_F('CvoxBrailleInputHandlerUnitTest', 'InputContracted', function() {
+  var editor = this.createEditor();
+  this.inputHandler.setTranslator(this.contractedTranslator,
+                                  this.uncontractedTranslator);
+  editor.setActive(true);
+  editor.focus('text');
+  this.assertExpandingSelection();
+
+  // First, type a 'b'.
+  assertTrue(this.sendCells('12'));
+  // Remember that the contracted translator produces uppercase.
+  editor.assertContentIs('BUT', 'BUT'.length);
+  this.assertExpandingNone();
+
+  // From here on, the input handler needs to replace already entered text.
+  editor.setAllowDeletes(true);
+  // Typing 'rl' changes to a different contraction.
+  assertTrue(this.sendCells('1235 123'));
+  editor.assertContentIs('BRAILLE', 'BRAILLE'.length);
+  // Now, finish the word.
+  assertTrue(this.sendCells('0'));
+  editor.assertContentIs('BRAILLE ', 'BRAILLE '.length);
+  this.assertExpandingNone();
+
+  // Move the cursor to the beginning.
+  editor.select(0);
+  this.assertExpandingSelection();
+
+  // Typing now uses the uncontracted table.
+  assertTrue(this.sendCells('12'));  // 'b'
+  editor.assertContentIs('bBRAILLE ', 1);
+  this.assertExpandingSelection();
+  editor.select('bBRAILLE'.length);
+  this.assertExpandingSelection();
+  assertTrue(this.sendCells('12')); // 'b'
+  editor.assertContentIs('bBRAILLEb ', 'bBRAILLEb'.length);
+  // Move to the end, where contracted typing should work.
+  editor.select('bBRAILLEb '.length);
+  assertTrue(this.sendCells('1456 0'));  // Symbol for 'this', then space.
+  this.assertExpandingNone();
+  editor.assertContentIs('bBRAILLEb THIS ', 'bBRAILLEb this '.length);
+
+  // Move between the two words.
+  editor.select('bBRAILLEb'.length);
+  this.assertExpandingSelection();
+  assertTrue(this.sendCells('0'));
+  assertTrue(this.sendCells('12'));  // 'b' for 'but'
+  editor.assertContentIs('bBRAILLEb BUT THIS ', 'bBRAILLEb BUT'.length);
+  this.assertExpandingNone();
+});
+
+
+TEST_F('CvoxBrailleInputHandlerUnitTest', 'TypingUrlWithContracted',
+       function() {
+  var editor = this.createEditor();
+  this.inputHandler.setTranslator(this.contractedTranslator,
+                                  this.uncontractedTranslator);
+  editor.setActive(true);
+  editor.focus('url');
+  this.assertExpandingAll();
+  assertTrue(this.sendCells('1245'));  // 'g'
+  editor.insert('oogle.com', true /*select*/);
+  editor.assertContentIs('google.com', 1, 'google.com'.length);
+  this.assertExpandingAll();
+  this.sendCells('135');  // 'o'
+  editor.insert('ogle.com', true /*select*/);
+  editor.assertContentIs('google.com', 2, 'google.com'.length);
+  this.assertExpandingAll();
+  this.sendCells('0');
+  editor.assertContentIs('go ', 'go '.length);
+  // In a URL, even when the cursor is in whitespace, all of the value
+  // is expanded to uncontracted braille.
+  this.assertExpandingAll();
+});
+
+
+TEST_F('CvoxBrailleInputHandlerUnitTest', 'Backspace', function() {
+  var editor = this.createEditor();
+  this.inputHandler.setTranslator(this.contractedTranslator,
+                                  this.uncontractedTranslator);
+  editor.setActive(true);
+  editor.focus('text');
+
+  // Add some text that we can delete later.
+  editor.setContent('Text ', 'Text '.length);
+
+  // The IME needs to delete text, even when typing.
+  editor.setAllowDeletes(true);
+  // Type 'brl' to make sure replacement works when deleting text.
+  assertTrue(this.sendCells('12 1235 123'));
+  editor.assertContentIs('Text BRAILLE', 'Text BRAILLE'.length);
+
+  // Delete what we just typed, one cell at a time.
+  this.sendKeyEvent('Backspace');
+  editor.assertContentIs('Text BR', 'Text BR'.length);
+  this.sendKeyEvent('Backspace');
+  editor.assertContentIs('Text BUT', 'Text BUT'.length);
+  this.sendKeyEvent('Backspace');
+  editor.assertContentIs('Text ', 'Text '.length);
+
+  // Now, backspace should be handled as usual, synthetizing key events.
+  assertEquals(0, this.keyEvents.length);
+  this.sendKeyEvent('Backspace');
+  assertEqualsJSON([{keyCode: 8, keyName: 'Backspace', charValue: 8}],
+                   this.keyEvents);
+});
+
+
+TEST_F('CvoxBrailleInputHandlerUnitTest', 'KeysImeNotActive', function() {
+  var editor = this.createEditor();
+  this.sendKeyEvent('Enter');
+  this.sendKeyEvent('ArrowUp');
+  assertEqualsJSON([{keyCode: 13, keyName: 'Enter', charValue: 0x0A},
+                    {keyCode: 38, keyName: 'ArrowUp', charValue: 0x41}],
+                   this.keyEvents);
+});