Add support for running browser tests to the test runner.

test/runner/loader_test.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.
 
 import 'dart:io';
 
 import 'package:path/path.dart' as p;
 import 'package:unittest/src/backend/state.dart';
+import 'package:unittest/src/runner/test_platform.dart';
 import 'package:unittest/src/runner/loader.dart';
 import 'package:unittest/unittest.dart';
 
 import '../io.dart';
 import '../utils.dart';
 
 Loader _loader;
 String _sandbox;
 
 final _tests = """
 import 'dart:async';
 
 import 'package:unittest/unittest.dart';
 
 void main() {
   test("success", () {});
   test("failure", () => throw new TestFailure('oh no'));
   test("error", () => throw 'oh no');
 }
 """;
 
 void main() {
   setUp(() {
-    _loader = new Loader(packageRoot: p.join(packageDir, 'packages'));
+    _loader = new Loader([TestPlatform.vm],
+        packageRoot: p.join(packageDir, 'packages'));
     _sandbox = Directory.systemTemp.createTempSync('unittest_').path;
   });
 
   tearDown(() {
     new Directory(_sandbox).deleteSync(recursive: true);
     return _loader.close();
   });
 
   group(".loadFile()", () {
     var suite;
     setUp(() {
       /// TODO(nweiz): Use scheduled_test for this once it's compatible with
       /// this version of unittest.
       new File(p.join(_sandbox, 'a_test.dart')).writeAsStringSync(_tests);
-      return _loader.loadFile(p.join(_sandbox, 'a_test.dart'))
-          .then((suite_) => suite = suite_);
+      return _loader.loadFile(p.join(_sandbox, 'a_test.dart')).then((suites) {
+        expect(suites, hasLength(1));
+        suite = suites.first;
+      });
     });
 
-    test("returns a suite with a name matching the file path", () {
-      expect(suite.name, equals(p.join(_sandbox, 'a_test.dart')));
+    test("returns a suite with the file path and platform", () {
+      expect(suite.path, equals(p.join(_sandbox, 'a_test.dart')));
+      expect(suite.platform, equals('VM'));
     });
 
-    test("returns tests with the correct names", () {
+    test("returns tests with the correct names and platforms", () {
       expect(suite.tests, hasLength(3));
       expect(suite.tests[0].name, equals("success"));
       expect(suite.tests[1].name, equals("failure"));
       expect(suite.tests[2].name, equals("error"));
     });
 
     test("can load and run a successful test", () {
       var liveTest = suite.tests[0].load(suite);
 
       expectStates(liveTest, [
         const State(Status.running, Result.success),
         const State(Status.complete, Result.success)
       ]);
       expectErrors(liveTest, []);
 
       return liveTest.run().whenComplete(() => liveTest.close());
     });
 
     test("can load and run a failing test", () {
       var liveTest = suite.tests[1].load(suite);
       expectSingleFailure(liveTest);
       return liveTest.run().whenComplete(() => liveTest.close());
     });
 
     test("throws a nice error if the package root doesn't exist", () {
-      var loader = new Loader();
+      var loader = new Loader([TestPlatform.vm]);
       expect(() {
         try {
           loader.loadFile(p.join(_sandbox, 'a_test.dart'));
         } finally {
           loader.close();
         }
       }, throwsA(isLoadException(
           "Directory ${p.join(_sandbox, 'packages')} does not exist.")));
     });
   });
@@ skipping 24 matching lines @@
         new File(p.join(_sandbox, 'a_test.dart')).writeAsStringSync(_tests);
         new File(p.join(_sandbox, 'another_test.dart'))
             .writeAsStringSync(_tests);
         new Directory(p.join(_sandbox, 'dir')).createSync();
         new File(p.join(_sandbox, 'dir/sub_test.dart'))
             .writeAsStringSync(_tests);
 
         return _loader.loadDir(_sandbox).then((suites_) => suites = suites_);
       });
 
-      test("names those suites after their files", () {
-        expect(suites.map((suite) => suite.name), unorderedEquals([
+      test("gives those suites the correct paths", () {
+        expect(suites.map((suite) => suite.path), unorderedEquals([
           p.join(_sandbox, 'a_test.dart'),
           p.join(_sandbox, 'another_test.dart'),
           p.join(_sandbox, 'dir/sub_test.dart')
         ]));
       });
 
       test("can run tests in those suites", () {
-        var suite = suites.firstWhere((suite) => suite.name.contains("a_test"));
+        var suite = suites.firstWhere((suite) => suite.path.contains("a_test"));
         var liveTest = suite.tests[1].load(suite);
         expectSingleFailure(liveTest);
         return liveTest.run().whenComplete(() => liveTest.close());
       });
     });
   });
 }