Add a Pub source that checks packages out from Git.

utils/tests/pub/pub_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('pub_tests');
 
 #import('dart:io');
 
 #import('test_pub.dart');
 #import('../../../lib/unittest/unittest.dart');
@@ skipping 74 matching lines @@
 installCommand() {
   testPub('adds a dependent package',
     sdk: [
       dir('lib', [
         dir('foo', [
           file('foo.dart', 'main() => "foo";')
         ])
       ])
     ],
     app: dir('myapp', [
-      file('pubspec', 'dependencies:\n- foo')
+      file('pubspec', 'dependencies:\n  foo:')
     ]),
     args: ['install'],
     expectedPackageDir: [
       dir('foo', [
         file('foo.dart', 'main() => "foo";')
       ])
     ],
     output: '''
     Dependencies installed!
     ''');
 
   testPub('adds a transitively dependent package',
     sdk: [
       dir('lib', [
         dir('foo', [
           file('foo.dart', 'main() => "foo";'),
-          file('pubspec', 'dependencies:\n- bar')
+          file('pubspec', 'dependencies:\n  bar:')
         ]),
         dir('bar', [
           file('bar.dart', 'main() => "bar";'),
         ])
       ])
     ],
     app: dir('myapp', [
-      file('pubspec', 'dependencies:\n- foo')
+      file('pubspec', 'dependencies:\n  foo:')
     ]),
     args: ['install'],
     expectedPackageDir: [
       dir('foo', [
         file('foo.dart', 'main() => "foo";')
       ]),
       dir('bar', [
         file('bar.dart', 'main() => "bar";'),
       ])
     ],
     output: '''
     Dependencies installed!
     ''');
 }
 
 versionCommand() {
   testPub('displays the current version',
     args: ['version'],
     output: VERSION_STRING);
 }