Fix running browser tests in subdirectories and release 0.12.0-beta.10.

test/runner/browser/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.
 
 @TestOn("vm")
 
 import 'dart:io';
 
 import 'package:path/path.dart' as p;
 import 'package:test/src/util/io.dart';
@@ skipping 280 matching lines @@
       expect("Compiling".allMatches(result.stdout), hasLength(1));
       expect(result.exitCode, equals(0));
     });
 
     test("on the browser and the VM", () {
       new File(p.join(_sandbox, "test.dart")).writeAsStringSync(_success);
       var result = _runUnittest(["-p", "chrome", "-p", "vm", "test.dart"]);
       expect(result.exitCode, equals(0));
     });
 
+    // Regression test; this broke in 0.12.0-beta.9.
+    test("on a file in a subdirectory", () {
+      new Directory(p.join(_sandbox, "dir")).createSync();
+      new File(p.join(_sandbox, "dir", "test.dart"))
+          .writeAsStringSync(_success);
+      var result = _runUnittest(["-p", "chrome", "dir/test.dart"]);
+      expect(result.exitCode, equals(0));
+    });
+
     group("with a custom HTML file", () {
       setUp(() {
         new File(p.join(_sandbox, "test.dart")).writeAsStringSync("""
 import 'dart:html';
 
 import 'package:test/test.dart';
 
 void main() {
   test("success", () {
     expect(document.query('#foo'), isNotNull);
@@ skipping 170 matching lines @@
 ''');
 
     var result = _runUnittest(["-p", "chrome", "test.dart"]);
     expect(result.stdout, contains("Test timed out after 0 seconds."));
     expect(result.stdout, contains("-1: Some tests failed."));
   });
 }
 
 ProcessResult _runUnittest(List<String> args) =>
     runUnittest(args, workingDirectory: _sandbox);