MD Settings: animation interface

chrome/test/data/webui/mocha_adapter.js

 // 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.
 
 /**
  * @fileoverview A mocha adapter for BrowserTests. To use, include mocha.js and
  * mocha_adapter.js in a WebUIBrowserTest's extraLibraries array.
  */
 
 // NOTE: When defining TEST_F() functions that use Mocha, use 'var self = this'
@@ skipping 17 matching lines @@
     passes++;
   });
 
   // Report failures. Mocha only catches "assert" failures, because "expect"
   // failures are caught by test_api.js.
   runner.on('fail', function(test, err) {
     failures++;
     var message = 'Mocha test failed: ' + test.fullTitle() + '\n';
 
     // Remove unhelpful mocha lines from stack trace.
-    var stack = err.stack.split('\n');
-    for (var i = 0; i < stack.length; i++) {
-      if (stack[i].indexOf('mocha.js:') == -1)
-        message += stack[i] + '\n';
+    if (err.stack) {
+      var stack = err.stack.split('\n');
+      for (var i = 0; i < stack.length; i++) {
+        if (stack[i].indexOf('mocha.js:') == -1)
+          message += stack[i] + '\n';
+      }
+    } else {
+      message += err.toString();
     }
 
     console.error(message);
   });
 
   // Report the results to the test API.
   runner.on('end', function() {
     if (failures == 0) {
       if (passes > 0)
         testDone();
@@ skipping 13 matching lines @@
 mocha.setup({
   // Use TDD interface instead of BDD.
   ui: 'tdd',
   // Use custom reporter to interface with BrowserTests.
   reporter: BrowserTestReporter,
   // Mocha timeouts are set to 2 seconds initially. This isn't nearly enough for
   // slower bots (e.g., Dr. Memory). Disable timeouts globally, because the C++
   // will handle it (and has scaled timeouts for slower bots).
   enableTimeouts: false,
 });