Pass actual TestPlatform and OperatingSystem values to Suite.

lib/test.dart

 // Copyright (c) 2013, 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.
 
 library test;
 
 import 'dart:async';
 
 import 'package:path/path.dart' as p;
 
@@ skipping 32 matching lines @@
   var declarer = Zone.current[#test.declarer];
   if (declarer != null) return declarer;
   if (_globalDeclarer != null) return _globalDeclarer;
 
   // Since there's no Zone-scoped declarer, the test file is being run directly.
   // In order to run the tests, we set up our own Declarer via
   // [_globalDeclarer], and schedule a microtask to run the tests once they're
   // finished being defined.
   _globalDeclarer = new Declarer();
   scheduleMicrotask(() async {
-    var suite =
-        new Suite(_globalDeclarer.tests,
-              path: p.prettyUri(Uri.base),
-              platform: "VM")
-        .forPlatform(TestPlatform.vm, os: currentOSGuess);
+    var suite = new Suite(
+        _globalDeclarer.tests,
+        path: p.prettyUri(Uri.base),
+        platform: TestPlatform.vm,
+        os: currentOSGuess);
 
     var engine = new Engine();
     engine.suiteSink.add(suite);
     engine.suiteSink.close();
     ExpandedReporter.watch(engine,
         color: true, printPath: false, printPlatform: false);
 
     var success = await engine.run();
     // TODO(nweiz): Set the exit code on the VM when issue 6943 is fixed.
     if (success) return;
@@ skipping 108 matching lines @@
 /// group. [callback] will be run before any tear-down callbacks in parent
 /// groups or at the top level.
 void tearDown(callback()) => _declarer.tearDown(callback);
 
 /// Registers an exception that was caught for the current test.
 void registerException(error, [StackTrace stackTrace]) {
   // This will usually forward directly to [Invoker.current.handleError], but
   // going through the zone API allows other zones to consistently see errors.
   Zone.current.handleUncaughtError(error, stackTrace);
 }