Spit pub tests into smaller suites.

utils/tests/pub/update/hosted/fail_gracefully_on_missing_package_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('../../../../../pkg/unittest/unittest.dart');
+
+main() {
+  test('fails gracefully if the package does not exist', () {
+    servePackages([]);
+
+    appDir([dependency("foo", "1.2.3")]).scheduleCreate();
+
+    schedulePub(args: ['update'],
+        error: const RegExp('Could not find package "foo" on '
+                            'http://localhost:'),
+        exitCode: 1);
+
+    run();
+  });
+}