Replace the existing unittest APIs with the new runner infrastructure.

test/runner_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/exit_codes.dart' as exit_codes;
 import 'package:unittest/unittest.dart';
 
 import 'io.dart';
 
 String _sandbox;
 
 final _success = """
 import 'dart:async';
 
+import 'package:unittest/unittest.dart';
+
 void main() {
-  var declarer = Zone.current[#unittest.declarer];
-  declarer.test("success", () {});
+  test("success", () {});
 }
 """;
 
 final _failure = """
 import 'dart:async';
 
 import 'package:unittest/unittest.dart';
 
 void main() {
-  var declarer = Zone.current[#unittest.declarer];
-  declarer.test("failure", () => throw new TestFailure("oh no"));
+  test("failure", () => throw new TestFailure("oh no"));
 }
 """;
 
 void main() {
   setUp(() {
     _sandbox = Directory.systemTemp.createTempSync('unittest_').path;
   });
 
   tearDown(() {
     new Directory(_sandbox).deleteSync(recursive: true);
@@ skipping 118 matching lines @@
     test("defaulting to the test directory", () {
       new Directory(p.join(_sandbox, "test")).createSync();
       for (var i = 0; i < 3; i++) {
         new File(p.join(_sandbox, "test", "${i}_test.dart"))
             .writeAsStringSync(_success);
       }
 
       var result = _runUnittest([]);
       expect(result.exitCode, equals(0));
     });
+
+    test("directly", () {
+      new File(p.join(_sandbox, "test.dart")).writeAsStringSync(_success);
+      var result = _runDart([
+        "--package-root=${p.join(packageDir, 'packages')}",
+        "test.dart"
+      ]);
+      expect(result.stdout, contains("All tests passed!"));
+    });
   });
 
   group("runs failing tests", () {
     test("defined in a single file", () {
       new File(p.join(_sandbox, "test.dart")).writeAsStringSync(_failure);
       var result = _runUnittest(["test.dart"]);
       expect(result.exitCode, equals(1));
     });
 
     test("defined in a directory", () {
       for (var i = 0; i < 3; i++) {
         new File(p.join(_sandbox, "${i}_test.dart"))
             .writeAsStringSync(_failure);
       }
 
       var result = _runUnittest(["."]);
       expect(result.exitCode, equals(1));
     });
 
     test("defaulting to the test directory", () {
       new Directory(p.join(_sandbox, "test")).createSync();
       for (var i = 0; i < 3; i++) {
         new File(p.join(_sandbox, "test", "${i}_test.dart"))
             .writeAsStringSync(_failure);
       }
 
       var result = _runUnittest([]);
       expect(result.exitCode, equals(1));
     });
+
+    test("directly", () {
+      new File(p.join(_sandbox, "test.dart")).writeAsStringSync(_failure);
+      var result = _runDart([
+        "--package-root=${p.join(packageDir, 'packages')}",
+        "test.dart"
+      ]);
+      expect(result.stdout, contains("Some tests failed."));
+    });
   });
 }
 
 ProcessResult _runUnittest(List<String> args) =>
     runUnittest(args, workingDirectory: _sandbox);
+
+ProcessResult _runDart(List<String> args) =>
+    runDart(args, workingDirectory: _sandbox);