Fix test failure in list_selection_model_test.html and port to automated browser test.

chrome/test/data/webui/webui_resource_test.js

 // Copyright 2013 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.
 
 /**
  * Tests that an observation matches the expected value.
  * @param {Object} expected The expected value.
  * @param {Object} observed The actual value.
  * @param {string=} opt_message Optional message to include with a test
  *     failure.
@@ skipping 54 matching lines @@
   try {
     f();
   } catch(err) {
     triggeredError = true;
   }
   if (!triggeredError)
     throw new Error('Assertion Failed: throw expected.');
 }
 
 /**
+ * Verifies that the contents of the expected and observed arrays match.
+ * @param {Array} expected The expected result.

[Dan Beam, 2013/06/20 21:38:03]

!Array

[kevers, 2013/06/21 13:30:49]

Done.

+ * @param {Array} observed The actual result.
+ */
+function assertArrayEquals(expected, observed) {
+  var v1 = Array.prototype.slice.call(expected);

[Dan Beam, 2013/06/20 21:38:03]

Array.prototype.slice.call(null)
TypeError: Array.prototype.slice called on null or undefined

+  var v2 = Array.prototype.slice.call(observed);
+  var equal = v1.length == v2.length;
+  if (equal) {
+    for (var i = 0; i < v1.length; i++) {
+      if (v1[i] !== v2[i]) {
+        equal = false;
+        break;
+      }
+    }
+  }
+  if (!equal) {
+    var message = 'Assertion Failed\n  Observed: ' + v2 +
+        '\n  Expected: ' + v1;
+    throw new Error(message);
+  }
+}
+
+/**
  * Runs all functions starting with test and reports success or
  * failure of the test suite.
  */
 function runTests() {
   var tests = [];
 
   if (window.setUp)
     window.setUp();
 
   var success = true;
@@ skipping 26 matching lines @@
  * @param {boolean} success Indicates if the test completed successfully.
  */
 function endTests(success) {
   domAutomationController.setAutomationId(1);
   domAutomationController.send(success ? 'SUCCESS' : 'FAILURE');
 }
 
 window.onerror = function() {
   endTests(false);
 };