Run dart2js tests unmodified in browser.

dart/pkg/unittest/test_controller.js

 // Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 /**
  * Test controller logic - used by unit test harness to embed tests in
  * DumpRenderTree.
  */
 
 if (navigator.webkitStartDart) {
   navigator.webkitStartDart();
 }
 
 var testRunner = window.testRunner || window.layoutTestController;
 
+var waitForDone = false;
+
 function processMessage(msg) {
-  if (testRunner) {
-    if (msg == 'unittest-suite-done') {
-      testRunner.notifyDone();
-    } else if (msg == 'unittest-suite-wait-for-done') {
-      testRunner.startedDartTest = true;
+  if (typeof msg != 'string') return;
+  if (msg == 'unittest-suite-done') {
+    if (testRunner) testRunner.notifyDone();
+  } else if (msg == 'unittest-suite-wait-for-done') {
+    waitForDone = true;
+    if (testRunner) testRunner.startedDartTest = true;
+  } else if (msg == 'dart-calling-main') {
+    if (testRunner) testRunner.startedDartTest = true;
+  } else if (msg == 'dart-main-done') {
+    if (!waitForDone) {
+      window.postMessage('unittest-suite-success', '*');
     }
+  } else if (msg == 'unittest-suite-success') {
+    document.body.innerHTML += '<pre>PASS</pre>';
+    if (testRunner) testRunner.notifyDone();
+  } else if (msg == 'unittest-suite-fail') {
+    showErrorAndExit('Some tests failed.');
   }
 }
 
 function onReceive(e) {
   processMessage(e.data);
 }
 
 if (testRunner) {
   testRunner.dumpAsText();
   testRunner.waitUntilDone();
@@ skipping 19 matching lines @@
 }
 
 window.addEventListener("DOMContentLoaded", onLoad, false);
 
 // If nobody intercepts the error, finish the test.
 window.addEventListener("error", function(e) {
   // needed for dartium compilation errors.
   showErrorAndExit(e && e.message);
 }, false);
 
-document.onreadystatechange = function() {
+document.addEventListener('readystatechange', function () {
   if (document.readyState != "loaded") return;
   // If 'startedDartTest' is not set, that means that the test did not have
   // a chance to load. This will happen when a load error occurs in the VM.
   // Give the machine time to start up.
   setTimeout(function() {
     // A window.postMessage might have been enqueued after this timeout.
     // Just sleep another time to give the browser the time to process the
     // posted message.
     setTimeout(function() {
       if (testRunner && !testRunner.startedDartTest) {
         testRunner.notifyDone();
       }
     }, 0);
   }, 50);
-};
+});
+
+function dartPrint(msg) {
+  if ((msg === 'unittest-suite-success')

[kasperl, 2012/09/10 10:46:30]

Maybe this could be based on a message prefix like POSTMESSAGE or something like
that?

+      || (msg === 'unittest-suite-wait-for-done')) {
+    window.postMessage(msg, '*');
+    return;
+  }
+  var pre = document.createElement("pre");
+  pre.appendChild(document.createTextNode(String(msg)));
+  document.body.appendChild(pre);
+}
+
+function dartMainRunner(main) {
+  window.postMessage('dart-calling-main', '*');
+  main();
+  window.postMessage('dart-main-done', '*');
+}