Convert asynchronous closure test in cr.ui framework to a 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 78 matching lines @@
     }
   }
   if (!equal) {
     var message =
        ['Assertion Failed', 'Observed: ' + v2, 'Expected: ' + v1].join('\n  ');
     throw new Error(message);
   }
 }
 
 /**
- * Runs all functions starting with test and reports success or
- * failure of the test suite.
+ * Defines runTests.
  */
-function runTests() {
-  var tests = [];
-  var success = true;
-  for (var name in window) {
-    if (typeof window[name] == 'function' && /^test/.test(name))
-      tests.push(name);
+(function(exports) {
+  /**
+   * List of test cases.
+   * @type {Array.<string>} List of function names for tests to run.
+   */
+  var testCases = [];
+
+  /**
+   * Indicates if all tests have run successfully.
+   * @type {boolean}
+   */
+  var cleanTestRun = true;
+
+  /**
+   * Armed during setup of a test to call the matching tear down code.
+   * @type {Function}
+   */
+  var pendingTearDown = null;
+
+  /**
+   * Runs all functions starting with test and reports success or
+   * failure of the test suite.
+   */
+  function runTests() {
+    for (var name in window) {
+      if (typeof window[name] == 'function' && /^test/.test(name))
+        testCases.push(name);
+    }
+    if (!testCases.length) {
+      console.error('Failed to find test cases.');
+      cleanTestRun = false;
+    }
+    continueTesting();
   }
-  if (!tests.length) {
-    console.error('\nFailed to find test cases.');
-    success = false;
-  }
-  for (var i = 0; i < tests.length; i++) {
-    try {
-      if (window.setUp)
-        window.setUp();
-      window[tests[i]]();
-    } catch (err) {
-      console.error('Failure in test ' + tests[i] + '\n' + err);
-      console.log(err.stack);
-      success = false;
+
+  /**
+   * Runs the next test in the queue. Reports the test results if the queue is
+   * empty.
+   */
+  function continueTesting() {
+    if (pendingTearDown) {
+      pendingTearDown();
+      pendingTearDown = null;
     }
-    if (window.tearDown)
-      window.tearDown();
-  }
-  endTests(success);
-}
+    if (testCases.length > 0) {
+      var fn = testCases.pop();
+      var isAsyncTest = window[fn].length;
+      try {
+        if (window.setUp)
+          window.setUp();
+        pendingTearDown = window.tearDown;
+        window[fn](continueTesting);
+      } catch(err) {
+        console.error('Failure in test ' + fn + '\n' + err);
+        console.log(err.stack);
+        cleanTestRun = false;
+      }
+      // Asynchronous tests must manually call continueTesting when complete.
+      if (!isAsyncTest)
+        continueTesting();
+    } else {
+      endTests(cleanTestRun);
+    }
+    if (testCases.length) {
+      domAutomationController.setAutomationId(1);
+      domAutomationController.send('PENDING');
+    }
+  };
+
+  exports.runTests = runTests;
+})(this);
 
 /**
  * Signals completion of a test.
  * @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);
 };