Make pathos run in the browser.

pkg/pathos/test/pathos_windows_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_windows_test;
 
-import 'dart:io' as io;
-
 import 'package:unittest/unittest.dart';
 import 'package:pathos/path.dart' as path;
 
 main() {
   var builder = new path.Builder(style: path.Style.windows,
                                  root: r'C:\root\path');
 
   if (new path.Builder().style == path.Style.windows) {
     group('absolute', () {
       expect(path.absolute(r'a\b.txt'), path.join(path.current, r'a\b.txt'));
@@ skipping 307 matching lines @@
       test('given relative path', () {
         // The path is considered relative to the root, so it basically just
         // normalizes.
         expect(builder.relative(''), '.');
         expect(builder.relative('.'), '.');
         expect(builder.relative('a'), 'a');
         expect(builder.relative(r'a\b.txt'), r'a\b.txt');
         expect(builder.relative(r'..\a\b.txt'), r'..\a\b.txt');
         expect(builder.relative(r'a\.\b\..\c.txt'), r'a\c.txt');
       });
+
+      // Regression
+      test('from root-only path', () {
+        expect(builder.relative(r'C:\', from: r'C:\'), '.');
+        expect(builder.relative(r'C:\root\path', from: r'C:\'), r'root\path');
+      });
     });
 
     group('from relative root', () {
       var r = new path.Builder(style: path.Style.windows, root: r'foo\bar');
 
       test('given absolute path', () {
         expect(r.relative(r'C:\'), equals(r'C:\'));
         expect(r.relative(r'C:\a\b'), equals(r'C:\a\b'));
       });
 
@@ skipping 32 matching lines @@
       expect(() => r.relative('..', from: r'C:\foo\bar'), throwsArgumentError);
       expect(r.relative(r'C:\foo\bar\baz', from: r'foo\bar'),
           equals(r'C:\foo\bar\baz'));
       expect(r.relative('..', from: r'foo\bar'), equals(r'..\..\..'));
     });
 
     test('given absolute with different root prefix', () {
       expect(builder.relative(r'D:\a\b'), r'D:\a\b');
       expect(builder.relative(r'\\a\b'), r'\\a\b');
     });
+
+    test('from a . root', () {
+      var r = new path.Builder(style: path.Style.windows, root: '.');
+      expect(r.relative(r'C:\foo\bar\baz'), equals(r'C:\foo\bar\baz'));
+      expect(r.relative(r'foo\bar\baz'), equals(r'foo\bar\baz'));
+    });
   });
 
   group('resolve', () {
     test('allows up to seven parts', () {
       expect(builder.resolve('a'), r'C:\root\path\a');
       expect(builder.resolve('a', 'b'), r'C:\root\path\a\b');
       expect(builder.resolve('a', 'b', 'c'), r'C:\root\path\a\b\c');
       expect(builder.resolve('a', 'b', 'c', 'd'), r'C:\root\path\a\b\c\d');
       expect(builder.resolve('a', 'b', 'c', 'd', 'e'),
           r'C:\root\path\a\b\c\d\e');
@@ skipping 27 matching lines @@
     expect(builder.withoutExtension(r'a\.'), r'a\.');
     expect(builder.withoutExtension(r'a\.b'), r'a\.b');
     expect(builder.withoutExtension(r'a.b\c'), r'a.b\c');
     expect(builder.withoutExtension(r'a/b.c/d'), r'a/b.c/d');
     expect(builder.withoutExtension(r'a\b/c'), r'a\b/c');
     expect(builder.withoutExtension(r'a\b/c.d'), r'a\b/c');
     expect(builder.withoutExtension(r'a.b/c'), r'a.b/c');
     expect(builder.withoutExtension(r'a\b.c\'), r'a\b\');
   });
 }