Implement modular compilation

test/codegen/unittest.dart

 // Copyright (c) 2015, 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.
 
 // TODO(jmesserly): replace this with the real package:test.
 // Not possible yet due to various bugs we still have.
 library minitest;
 
 import 'dart:async';
-import 'package:dom/dom.dart';
+import 'dart:js';
 import 'package:matcher/matcher.dart';
 export 'package:matcher/matcher.dart';
 
-void group(String name, void body()) => (window as dynamic).suite(name, body);
+void group(String name, void body()) => context.callMethod('suite', [name, body]);
 
 void test(String name, body(), {String skip}) {
   if (skip != null) {
     print('SKIP $name: $skip');
     return;
   }
-  (window as dynamic).test(name, (done) {
+  JsObject result = context.callMethod('test', [name, (JsFunction done) {
     _finishTest(f) {
       if (f is Future) {
         f.then(_finishTest);
       } else {
-        done();
+        done.apply([]);
       }
     }
     _finishTest(body());
-  });
+  }]);
+  result['async'] = 1;
 }
 
 
 // TODO(jmesserly): everything below this was stolen from
 // package:test/src/frontend/expect.dart
 
 /// An exception thrown when a test assertion fails.
 class TestFailure {
   final String message;
 
@@ skipping 50 matching lines @@
 
   var mismatchDescription = new StringDescription();
   matcher.describeMismatch(actual, mismatchDescription, matchState, verbose);
 
   if (mismatchDescription.length > 0) {
     description.add('   Which: ${mismatchDescription}\n');
   }
   if (reason != null) description.add(reason).add('\n');
   return description.toString();
 }