Get codebase ready for actually supporting versioning.

utils/tests/pub/version_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('version_test');
 
 #import('../../../lib/unittest/unittest.dart');
 #import('../../pub/version.dart');
 
 main() {
   group('Version', () {
+    test('none', () {
+      expect(Version.none.toString()).equals('0.0.0');
+    });
+
     group('constructor', () {
       test('throws on negative numbers', () {
         throwsIllegalArg(() => new Version(-1, 1, 1));
         throwsIllegalArg(() => new Version(1, -1, 1));
         throwsIllegalArg(() => new Version(1, 1, -1));
       });
     });
 
     group('comparison', () {
       // A correctly sorted list of versions.
@@ skipping 172 matching lines @@
   });
 }
 
 throwsIllegalArg(function) {
   expectThrow(function, (e) => e is IllegalArgumentException);
 }
 
 throwsBadFormat(function) {
   expectThrow(function, (e) => e is FormatException);
 }