Migrate walker tests from upstream ChromeVox.

chrome/browser/resources/chromeos/chromevox/walkers/walker_unittest_base.js

Index: chrome/browser/resources/chromeos/chromevox/walkers/walker_unittest_base.js
diff --git a/chrome/browser/resources/chromeos/chromevox/walkers/walker_unittest_base.js b/chrome/browser/resources/chromeos/chromevox/walkers/walker_unittest_base.js
new file mode 100644
index 0000000000000000000000000000000000000000..29b41ce57363e5c89a8c764fa982c1e4785652f5
--- /dev/null
+++ b/chrome/browser/resources/chromeos/chromevox/walkers/walker_unittest_base.js
@@ -0,0 +1,234 @@
+// 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.
+
+GEN_INCLUDE(['../testing/chromevox_unittest_base.js']);
+
+/**
+ * Base class for walker test fixtures.
+ * @constructor
+ * @extends {ChromeVoxUnitTestBase}
+ */
+function CvoxWalkerUnitTestBase() {}
+
+CvoxWalkerUnitTestBase.prototype = {
+  __proto__: ChromeVoxUnitTestBase.prototype,
+
+  /** @override */
+  closureModuleDeps: [
+    'cvox.CursorSelection',
+    'cvox.TestMsgs'
+  ],
+
+  /**
+   * Common set up for all walker test cases.
+   */
+  setUp: function() {
+    // Needed for getDescription and getGranularityMsg.
+    cvox.ChromeVox.msgs = new cvox.TestMsgs();
+
+    // Delete all nodes in the body.
+    while (document.body.hasChildNodes()) {
+      document.body.removeChild(document.body.lastChild);
+    }
+
+    this.walker = this.newWalker();
+  },
+
+  /**
+   * Returns a new walker appropriate for the child test.
+   * @return {!cvox.AbstractWalker} The walker instance.
+   */
+  newWalker: goog.abstractMethod,
+
+  /**
+   * Makes testing much less verbose. Executes the command on the
+   * selection, then asserts that for all the parameters passed in desc,
+   * the new selection matches. Returns the new selections if assertion passes.
+   * NOTE: If you change the parameters here, you should also change the
+   * whitelist above.
+   * @param {!cvox.CursorSelection} sel The selection.
+   * @param {!string|!cvox.CursorSelection} opt_cmdOrDest The command to
+   *  execute, or the override returned selection.
+   * @param {{selText: string=,
+   *          selNodeId: string=,
+   *          selParentNodeId: string=,
+   *          selStartIndex: number=,
+   *          selEndIndex: number=,
+   *          selReversed: boolean=,
+   *          descText: string=,
+   *          descContext: string=,
+   *          descAnnotation: string=,
+   *          descUserValue: string=,
+   *          descPersonality: string=}} desc The parameters to assert.
+   *    selText: The text in the new selection matches for both start and end.
+   *    selNodeId: The node in the new selection matches for both start and end.
+   *    selParentNodeId: The parent node of both start and end matches.
+   *    selStartIndex: The index of the absolute start.
+   *    selEndIndex: The index of the absolute end.
+   *    selReversed: True if should be reversed.
+   *    descText: The text in the NavDescription when getDescription is called.
+   *    descContext: The context in the NavDescription
+   *    descAnnotation: The annotation in the NavDescription
+   *    descUserValue: The userValue in the NavDescription
+   *    descPersonality: The personality in the NavDescription
+   * @return {cvox.CursorSelection} The new selection.
+   */
+  go: function(sel, opt_cmdOrDest, desc) {
+    if (opt_cmdOrDest instanceof cvox.CursorSelection) {
+      var ret = opt_cmdOrDest;
+    } else {
+      if (CvoxWalkerUnitTestBase.CMD_WHITELIST.indexOf(opt_cmdOrDest) == -1) {
+        // Intentionally fail the test if there's a typo.
+        throw 'Got an invalid command: "' + opt_cmdOrDest + '".';
+      }
+
+      var ret = this.walker[opt_cmdOrDest](sel);
+    }
+
+    if (ret == null) {
+      assertEquals(null, desc);
+      return;
+    }
+    if (desc == null) {
+      assertEquals(null, ret);
+      return;
+    }
+
+    for (var key in desc) {
+      if (CvoxWalkerUnitTestBase.DESC_WHITELIST.indexOf(key) == -1) {
+        throw 'Invalid key in desc parameter: "' + key + '".';
+      }
+    }
+
+    // Intentionally only check one-to-one and not onto. This allows us to
+    // write tests that just ignore everything except what we care about.
+    if (desc.hasOwnProperty('selText')) {
+      assertEquals(desc.selText, ret.start.text);
+      assertEquals(desc.selText, ret.end.text);
+    }
+    if (desc.hasOwnProperty('selNodeId')) {
+      assertEquals(desc.selNodeId, ret.start.node.id);
+      assertEquals(desc.selNodeId, ret.end.node.id);
+    }
+    if (desc.hasOwnProperty('selParentNodeId')) {
+      assertEquals(desc.selParentNodeId, ret.start.node.parentNode.id);
+      assertEquals(desc.selParentNodeId, ret.end.node.parentNode.id);
+    }
+    if (desc.hasOwnProperty('selStartIndex')) {
+      assertEquals(desc.selStartIndex, ret.absStart().index);
+    }
+    if (desc.hasOwnProperty('selEndIndex')) {
+      assertEquals(desc.selEndIndex, ret.absEnd().index);
+    }
+    if (desc.hasOwnProperty('selReversed')) {
+      assertEquals(desc.selReversed, ret.isReversed());
+    }
+
+    var trueDesc = this.walker.getDescription(sel, ret)[0];
+    if (desc.hasOwnProperty('descText')) {
+      assertEquals(desc.descText, trueDesc.text);
+    }
+    if (desc.hasOwnProperty('descContext')) {
+      assertEquals(desc.descContext, trueDesc.context);
+    }
+    if (desc.hasOwnProperty('descAnnotation')) {
+      assertEquals(desc.descAnnotation, trueDesc.annotation);
+    }
+    if (desc.hasOwnProperty('descUserValue')) {
+      assertEquals(desc.descUserValue, trueDesc.userValue);
+    }
+    if (desc.hasOwnProperty('descPersonality')) {
+      assertEquals(desc.descPersonality, trueDesc.personality);
+    }
+
+    return ret;
+  },
+};
+
+/**
+ * Whitelist for the commands that are allowed to be executed with go().
+ * @type {Array.string}
+ * @const
+ */
+CvoxWalkerUnitTestBase.CMD_WHITELIST = ['next', 'sync', 'nextRow', 'nextCol'];
+
+/**
+ * Whitelist for the properties that can be asserted with go().
+ * @type {Array.string}
+ * @const
+ */
+CvoxWalkerUnitTestBase.DESC_WHITELIST = ['selText', 'selNodeId',
+'selParentNodeId', 'selStartIndex', 'selEndIndex', 'selReversed', 'descText',
+'descContext', 'descAnnotation', 'descUserValue', 'descPersonality'];
+
+/**
+ * Adds common walker tests
+ * @param {string} testFixture Name of the test fixture class.
+ */
+CvoxWalkerUnitTestBase.addCommonTests = function(testFixture) {
+  /**
+   * Ensures that syncing to the beginning and ends of the page return
+   * not null.
+   */
+  TEST_F(testFixture, 'testSyncToPage', function() {
+    this.loadDoc(function() {/*!
+      <div><p id="a">a</p></div>
+    */});
+    var ret = this.walker.begin();
+    assertNotEquals(null, ret);
+    ret = this.walker.begin({reversed: true});
+    assertNotEquals(null, ret);
+  });
+
+  /**
+   * Ensures that sync(sync(sel)) = sync(sel)
+   * TODO (stoarca): The interfaces are not frozen yet. In particular,
+   * for TableWalker, sync can return null. Override if it doesn't work yet.
+   */
+  TEST_F(testFixture, 'testSyncInvariant', function() {
+    this.loadDoc(function() {/*!
+      <div id="outer">
+        <p id="a">a</p>
+        <p id="b">b</p>
+        <p id="c">c</p>
+        <p id="d">d</p>
+        <h1 id="A">h1</h1>
+        <p id="e">e</p>
+        <h1 id="B">h1</h1>
+      </div>
+    */});
+    var sel = cvox.CursorSelection.fromNode(
+        $('outer').firstChild);
+    var sync = this.walker.sync(sel);
+    var syncsync = this.walker.sync(sync);
+    assertEquals(true, sync.equals(syncsync));
+
+    sel = cvox.CursorSelection.fromNode($('a'));
+    sync = this.walker.sync(sel);
+    syncsync = this.walker.sync(sync);
+    assertEquals(true, sync.equals(syncsync));
+
+    sel = cvox.CursorSelection.fromNode($('e'));
+    sync = this.walker.sync(sel);
+    syncsync = this.walker.sync(sync);
+    assertEquals(true, sync.equals(syncsync));
+
+    sel = cvox.CursorSelection.fromBody();
+    sync = this.walker.sync(sel);
+    syncsync = this.walker.sync(sync);
+    assertEquals(true, sync.equals(syncsync));
+  });
+
+  /**
+   * Ensures that all operations work on an empty body.
+   */
+  TEST_F(testFixture, 'testEmptyBody', function() {
+    var sel = cvox.CursorSelection.fromBody();
+
+    // Testing for infinite loop. If one exists, this test will fail by timing
+    // out.
+    var sync = this.walker.sync(sel);
+    var next = this.walker.next(sel);
+  });
+};