step 1 in making unittest platform independent.

lib/unittest/unittest_html.dart

 // 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.
 
 /**
  * A simple unit test library for running tests in a browser.
  */
-#library("unittest");
+#library('unittest');
 
-#import("dart:html");
+#import('dart:html');
+#import('dart:isolate');
 
-#source("shared.dart");
+#source('config.dart');
+#source('shared.dart');
+#source('html_print.dart');
 
-// TODO(rnystrom): Get rid of this if we get canonical closures for methods.
-EventListener _onErrorClosure;
+/** Whether this is run within dartium layout tests. */
+bool _isLayoutTest = false;
 
-_platformInitialize() {
-  _onErrorClosure = (e) { _onError(e); };
+void forLayoutTests() {
+  _isLayoutTest = true;
 }
 
-_platformDefer(void callback()) {
-  window.setTimeout(callback, 0);
-}
-
-void _onError(e) {
- if (_currentTest < _tests.length) {
-    final testCase = _tests[_currentTest];
-    // TODO(vsm): figure out how to expose the stack trace here
-    // Currently e.message works in dartium, but not in dartc.
-    testCase.error('(DOM callback has errors) Caught ${e}', '');
-    _state = _UNCAUGHT_ERROR;
-    if (testCase.callbacks > 0) {
-      _currentTest++;
-      _testRunner();
+void serialInvokeAsync(List closures) {
+  final length = closures.length;
+  if (length > 0) {
+    int i = 0;
+    void invokeNext() {
+      closures[i]();
+      i++;
+      if (i < length) {
+        window.setTimeout(invokeNext, 0);
+      }
     }
+    window.setTimeout(invokeNext, 0);
   }
 }
 
-/** Runs all queued tests, one at a time. */
-_platformStartTests() {
-  window.postMessage('unittest-suite-wait-for-done', '*');
+class _DefaultConfiguration() {

[Bob Nystrom, 2012/04/10 01:17:15]

This doesn't look like valid Dart code. Ditch the () and add implements
Configuration.

[Siggi Cherem (dart-lang), 2012/04/10 01:28:44]

Doh!... fixed 

+  // TODO(rnystrom): Get rid of this if we get canonical closures for methods.
+  EventListener _onErrorClosure;
 
-  // Listen for uncaught errors.
-  window.on.error.add(_onErrorClosure);
-}
-
-_platformCompleteTests(int testsPassed, int testsFailed, int testsErrors) {
-  window.on.error.remove(_onErrorClosure);
-
-  if (_isLayoutTest && testsPassed == _tests.length) {
-    document.body.innerHTML = "PASS";
-  } else {
-    var newBody = new StringBuffer();
-    newBody.add("<table class='unittest-table'><tbody>");
-    newBody.add(testsPassed == _tests.length
-        ? "<tr><td colspan='3' class='unittest-pass'>PASS</td></tr>"
-        : "<tr><td colspan='3' class='unittest-fail'>FAIL</td></tr>");
-
-    for (final test_ in _tests) {
-      newBody.add(_toHtml(test_));
-    }
-
-    if (testsPassed == _tests.length) {
-      newBody.add("""
-          <tr><td colspan='3' class='unittest-pass'>
-            All ${testsPassed} tests passed
-          </td></tr>""");
-    } else {
-      newBody.add("""
-          <tr><td colspan='3'>Total
-            <span class='unittest-pass'>${testsPassed} passed</span>,
-            <span class='unittest-fail'>${testsFailed} failed</span>
-            <span class='unittest-error'>${testsErrors} errors</span>
-          </td></tr>""");
-    }
-    newBody.add("</tbody></table>");
-    document.body.innerHTML = newBody.toString();
+  void onInit() {
+    _onErrorClosure = (e) { _onError(e); };
   }
 
-  window.postMessage('unittest-suite-done', '*');
-}
-
-String _toHtml(TestCase test_) {
-  if (!test_.isComplete) {
-    return '''
-        <tr>
-          <td>${test_.id}</td>
-          <td class="unittest-error">NO STATUS</td>
-          <td>Test did not complete</td>
-        </tr>''';
+  void _onError(e) {
+   if (_currentTest < _tests.length) {
+      final testCase = _tests[_currentTest];
+      // TODO(vsm): figure out how to expose the stack trace here
+      // Currently e.message works in dartium, but not in dartc.
+      testCase.error('(DOM callback has errors) Caught ${e}', '');
+      _state = _UNCAUGHT_ERROR;
+      if (testCase.callbacks > 0) {
+        _currentTest++;
+        _testRunner();
+      }
+    }
   }
 
-  var html = '''
-      <tr>
-        <td>${test_.id}</td>
-        <td class="unittest-${test_.result}">${test_.result.toUpperCase()}</td>
-        <td>Expectation: ${test_.description}. ${_htmlEscape(test_.message)}</td>
-      </tr>''';
-
-  if (test_.stackTrace != null) {
-    html +=
-        '<tr><td></td><td colspan="2"><pre>${_htmlEscape(test_.stackTrace)}</pre></td></tr>';
+  void onStart() {
+    window.postMessage('unittest-suite-wait-for-done', '*');
+    // Listen for uncaught errors.
+    window.on.error.add(_onErrorClosure);
   }
 
-  return html;
+  void onResult(TestCase testCase) {}
+
+  onDone(int testsPassed, int testsFailed, int testsErrors,
+      List<TestCase> results) {
+    window.on.error.remove(_onErrorClosure);
+    _showResultsInPage(
+        testsPassed, testsFailed, testsErrors, results, _isLayoutTest);
+    window.postMessage('unittest-suite-done', '*');
+  }
 }
-
-//TODO(pquitslund): Move to a common lib
-String _htmlEscape(String string) {
-  return string.replaceAll('&', '&amp;')
-               .replaceAll('<','&lt;')
-               .replaceAll('>','&gt;');
-}