step 1 in making unittest platform independent.

lib/unittest/unittest_dom.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:dom");
+#import('dart:dom');
+#import('dart:isolate');
 
-#source("shared.dart");
+#source('config.dart');
+#source('shared.dart');
+#source('html_print.dart');
+
+/** Whether this is run within dartium layout tests. */
+bool _isLayoutTest = false;
+
+void forLayoutTests() {
+  _isLayoutTest = true;
+}
 
 // TODO(rnystrom): Get rid of this if we get canonical closures for methods.
 EventListener _onErrorClosure;
 
 _platformInitialize() {
   _onErrorClosure = (e) { _onError(e); };
 }
 
-_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();
     }
   }
 }
 
 /** Runs all queued tests, one at a time. */
 _platformStartTests() {
   window.postMessage('unittest-suite-wait-for-done', '*');
 
   // Listen for uncaught errors.
   window.addEventListener('error', _onErrorClosure, true);
 }
 
-_platformCompleteTests(int testsPassed, int testsFailed, int testsErrors) {
+_platformCompleteTests(int testsPassed, int testsFailed, int testsErrors,
+    List<TestCase> results) {
   window.removeEventListener('error', _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();
-  }
-
+  _showResultsInPage(
+      testsPassed, testsFailed, testsErrors, results, _isLayoutTest);
   window.postMessage('unittest-suite-done', '*');
 }
 
-String _toHtml(TestCase test_) {
-  if (!test_.isComplete) {
-    return '''
-        <tr>
-          <td>${test_.id}</td>
-          <td class="unittest-error">NO STATUS</td>
-          <td>Test did not complete</td>
-        </tr>''';
-  }
-
-  var html = '''
-      <tr>
-        <td>${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>';
-  }
-
-  return html;
+Configuration _defaultConfig() {
+  return new Configuration(
+      _platformInitialize,

[Bob Nystrom, 2012/04/10 00:30:31]

Instead of closures here, I would just subclass Configuration and make those
ugly _platform functions be overridden methods.

[Siggi Cherem (dart-lang), 2012/04/10 01:05:28]

Done.

+      _platformStartTests,
+      (testCase) {},
+      _platformCompleteTests);
 }
-
-//TODO(pquitslund): Move to a common lib
-String _htmlEscape(String string) {
-  return string.replaceAll('&', '&')
-               .replaceAll('<','&lt;')
-               .replaceAll('>','&gt;');
-}