First check in for pub package manager.

utils/tests/pub/pub_tests.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');
 
-// TODO(rnystrom): Better path to unittest.
+#import('dart:io');
+
+#import('test_pub.dart');
 #import('../../../lib/unittest/unittest_vm.dart');
 
 main() {
-  test('should pass', () {
-    expect(1).equals(1);
+  group('running pub with no command', () {
+    testOutput('displays usage',
+      [],
+      '''
+      Pub is a package manager for Dart.
+
+      Usage:
+
+        pub command [arguments]
+
+      The commands are:
+
+        version   print Pub version
+
+      Use "pub help [command]" for more information about a command.''');
+  });
+
+  group('the version command', () {
+    testOutput('displays the current version',
+      ['version'], 'Pub 0.0.0');
+  });
+
+  group('an unknown command', () {
+    testOutput('displays an error message',
+      ['quylthulg'],
+      '''
+      Unknown command "quylthulg".
+      Run "pub help" to see available commands.''',
+      exitCode: 64);
   });
 }