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);
   });
 }
+
+void testPub(String description, List<String> arguments, String expectedOutput) {

[nweiz, 2012/03/30 00:38:37]

This name doesn't match that being used in main(), and it doesn't have an
optional exitCode argument.

Also, line length.

[Bob Nystrom, 2012/03/30 01:06:17]

Oops, old code. Deleted.

+  // TODO(bob): Figure out how to invoke pub correctly.
+  Expect.fail('args = ${new Options().script}');

[nweiz, 2012/03/30 00:38:37]

Debugging line?

+
+  final process = new Process.start('pub', arguments);
+
+  final output = <String>[];
+  final outStream = new StringInputStream(process.stdout);
+  outStream.onLine = () {
+    var line = outStream.readLine();
+    while (line != null) {
+      output.add(line);
+      line = outStream.readLine();
+    }
+  };
+
+  process.onError = (error) {
+    Expect.fail('Failed to run pub: $error');
+  };
+
+  process.onExit = (exitCode) {
+    Expect.equals(exitCode, 0, 'Pub returned non-zero exit code.');
+    validateOutput(expectedOutput, output);
+  };
+}

[nweiz, 2012/03/30 00:38:37]

How does this async stuff integrate into the testing infrastructure? Don't you
have to notify something when the test is finished?

[Bob Nystrom, 2012/03/30 01:06:17]

Yeah, this is dead code. The real code is in test_pub.dart.