chrome/test/data/webui/mocha_adapter.js

   1 // Copyright 2015 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 /**
   6  * @fileoverview A mocha adapter for BrowserTests. To use, include mocha.js and
   7  * mocha_adapter.js in a WebUIBrowserTest's extraLibraries array.
   8  */
   9
  10 /**
  11  * Initializes a mocha reporter for the BrowserTest framework, which registers
  12  * event listeners on the given Runner.
  13  * @constructor
  14  * @param {Runner} runner Runs the tests and provides hooks for test results
  15  *     (see Runner.prototype in mocha.js).
  16  */
  17 function BrowserTestReporter(runner) {
  18   var passes = 0;
  19   var failures = 0;
  20
  21   // Increment passes for each passed test.
  22   runner.on('pass', function(test) {
  23     passes++;
  24   });
  25
  26   // Report failures. Mocha only catches "assert" failures, because "expect"
  27   // failures are caught by test_api.js.
  28   runner.on('fail', function(test, err) {
  29     failures++;
  30     var message = 'Mocha test failed: ' + test.fullTitle() + '\n';
  31
  32     // Remove unhelpful mocha lines from stack trace.
  33     var stack = err.stack.split('\n');
  34     for (var i = 0; i < stack.length; i++) {
  35       if (stack[i].indexOf('mocha.js:') == -1)
  36         message += stack[i] + '\n';
  37     }
  38
  39     console.error(message);
  40   });
  41
  42   // Report the results to the test API.
  43   runner.on('end', function() {
  44     if (failures == 0) {
  45       testDone();
  46       return;
  47     }
  48     testDone([
  49       false,
  50       'Test Errors: ' + failures + '/' + (passes + failures) +
  51       ' tests had failed assertions.'
  52     ]);
  53   });
  54 }
  55
  56 // Configure mocha.
  57 mocha.setup({
  58   // Use TDD interface instead of BDD.
  59   ui: 'tdd',
  60   // Use custom reporter to interface with BrowserTests.
  61   reporter: BrowserTestReporter,
  62 });