third_party/qunit/src/browser_test_harness.js

   1 // Copyright 2014 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
   7  * Integration module for QUnit tests running in browser tests.
   8  * Specifically it:
   9  * - Sets QUnit.autostart to false, so that the browser test can hook the test
  10  *   results callback before the test starts.
  11  * - Implements a text-based test reporter to report test results back to the
  12  *   browser test.
  13  */
  14
  15 (function(QUnit, automationController, exports) {
  16
  17 'use strict';
  18
  19 var TestReporter = function() {
  20   this.errorMessage_ = '';
  21   this.failedTestsCount_ = 0;
  22   this.failedAssertions_ = [];
  23 };
  24
  25 TestReporter.prototype.init = function(qunit) {
  26   qunit.testDone(this.onTestDone_.bind(this));
  27   qunit.log(this.onAssertion_.bind(this));
  28 };
  29
  30 TestReporter.prototype.onTestDone_ = function(details) {
  31   if (this.failedAssertions_.length > 0) {
  32     this.errorMessage_ += '  ' + details.module + '.' + details.name + '\n';
  33     this.errorMessage_ += this.failedAssertions_.map(
  34         function(assertion, index){
  35           return '    ' + (index + 1) + '. ' + assertion.message + '\n' +
  36                  '    ' + assertion.source;
  37         }).join('\n');
  38     this.failedAssertions_ = [];
  39     this.failedTestsCount_++;
  40   }
  41 };
  42
  43 TestReporter.prototype.onAssertion_ = function(details) {
  44   if (!details.result) {
  45     this.failedAssertions_.push(details);
  46   }
  47 };
  48
  49 TestReporter.prototype.getErrorMessage = function(){
  50   var errorMessage = '';
  51   if (this.failedTestsCount_ > 0) {
  52     var test = (this.failedTestsCount_ > 1) ? 'tests' : 'test';
  53     errorMessage = this.failedTestsCount_  + ' ' + test + ' failed:\n';
  54     errorMessage += this.errorMessage_;
  55   }
  56   return errorMessage;
  57 };
  58
  59 var BrowserTestHarness = function(qunit, domAutomationController, reporter) {
  60   this.qunit_ = qunit;
  61   this.automationController_ = domAutomationController;
  62   this.reporter_ = reporter;
  63 };
  64
  65 BrowserTestHarness.prototype.init = function() {
  66   this.qunit_.config.autostart = false;
  67 };
  68
  69 BrowserTestHarness.prototype.run = function() {
  70   this.reporter_.init(this.qunit_);
  71   this.qunit_.start();
  72   this.qunit_.done(function(details){
  73     this.automationController_.send(JSON.stringify({
  74       passed: details.passed == details.total,
  75       errorMessage: this.reporter_.getErrorMessage()
  76     }));
  77   }.bind(this));
  78 };
  79
  80 // The browser test runs chrome with the flag --dom-automation, which creates
  81 // the window.domAutomationController object.  This allows the test suite to
  82 // JS-encoded data back to the browser test.
  83 if (automationController) {
  84   if (!QUnit) {
  85     console.error('browser_test_harness.js must be included after QUnit.js.');
  86     return;
  87   }
  88
  89   var testHarness = new BrowserTestHarness(
  90       QUnit,
  91       automationController,
  92       new TestReporter());
  93   testHarness.init();
  94   exports.browserTestHarness = testHarness;
  95 }
  96
  97 })(window.QUnit, window.domAutomationController, window);