Make pathos run in the browser.

pkg/pathos/test/pathos_test.dart

 // Copyright (c) 2012, 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 pathos_test;
-
-import 'dart:io' as io;
-
 import 'package:unittest/unittest.dart';
 import 'package:pathos/path.dart' as path;
 
 main() {
   group('path.Style', () {
     test('name', () {
       expect(path.Style.posix.name, 'posix');
       expect(path.Style.windows.name, 'windows');
     });
 
@@ skipping 11 matching lines @@
   group('new Builder()', () {
     test('uses the given root directory', () {
       var builder = new path.Builder(root: '/a/b/c');
       expect(builder.root, '/a/b/c');
     });
 
     test('uses the given style', () {
       var builder = new path.Builder(style: path.Style.windows);
       expect(builder.style, path.Style.windows);
     });
-
-    test('uses the current working directory if root is omitted', () {
-      var builder = new path.Builder();
-      expect(builder.root, io.Directory.current.path);
-    });
-
-    test('uses the host OS if style is omitted', () {
-      var builder = new path.Builder();
-      if (io.Platform.operatingSystem == 'windows') {
-        expect(builder.style, path.Style.windows);
-      } else {
-        expect(builder.style, path.Style.posix);
-      }
-    });
-  });
-
-  test('current', () {
-    expect(path.current, io.Directory.current.path);
   });
 }