Analyze package:testing.

pkg/testing/test/analyze_test.dart

+// Copyright (c) 2017, 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.
+
+import "package:testing/src/run_tests.dart" as testing show main;
+
+main() {
+  // This method is async, but keeps a port open to prevent the VM from exiting
+  // prematurely.
+  return testing.main(
+      <String>["--config=pkg/testing/testing.json", "--verbose", "analyze"]);
+}