Add support for running browser tests to the test runner.

test/runner/browser/compiler_pool_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/util/exit_codes.dart' as exit_codes;
+import 'package:unittest/unittest.dart';
+
+import '../../io.dart';
+
+String _sandbox;
+
+void main() {
+  setUp(() {
+    _sandbox = Directory.systemTemp.createTempSync('unittest_').path;
+  });
+
+  tearDown(() {
+    new Directory(_sandbox).deleteSync(recursive: true);
+  });
+
+  test("doesn't intermingle warnings", () {
+    // These files need trailing newlines to work around issue 22667.
+    var testPath1 = p.join(_sandbox, "test1.dart");
+    new File(testPath1).writeAsStringSync("String main() => 12;\n");
+
+    var testPath2 = p.join(_sandbox, "test2.dart");
+    new File(testPath2).writeAsStringSync("int main() => 'foo';\n");
+
+    var result = _runUnittest(["-p", "chrome", "test1.dart", "test2.dart"]);
+    expect(result.stdout, equals("""
+Compiling test1.dart...
+test1.dart:1:18:
+Warning: 'int' is not assignable to 'String'.
+String main() => 12;
+                 ^^
+Compiling test2.dart...
+test2.dart:1:15:
+Warning: 'String' is not assignable to 'int'.
+int main() => 'foo';
+              ^^^^^
+"""));
+    expect(result.exitCode, equals(exit_codes.data));
+  });
+
+  test("uses colors if the test runner uses colors", () {
+    var testPath = p.join(_sandbox, "test.dart");
+    new File(testPath).writeAsStringSync("String main() => 12;\n");
+
+    var result = _runUnittest(["--color", "-p", "chrome", "test.dart"]);
+    expect(result.stdout, contains('\u001b[35m'));
+    expect(result.exitCode, equals(exit_codes.data));
+  });
+}
+
+ProcessResult _runUnittest(List<String> args) =>
+    runUnittest(args, workingDirectory: _sandbox);