Dart: Adds a program to create snapshots of Mojo apps.

mojo/dart/dart_snapshotter/test/dart_snapshotter_test.py

Index: mojo/dart/dart_snapshotter/test/dart_snapshotter_test.py
diff --git a/mojo/dart/dart_snapshotter/test/dart_snapshotter_test.py b/mojo/dart/dart_snapshotter/test/dart_snapshotter_test.py
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index 0000000000000000000000000000000000000000..146fdedf28fea4cbd089717edac085dddd98f75d
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+++ b/mojo/dart/dart_snapshotter/test/dart_snapshotter_test.py
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+#!/usr/bin/env python
+# Copyright 2015 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+import argparse
+import os
+import subprocess
+import sys
+import tempfile
+
+def main():
+  parser = argparse.ArgumentParser(description='Tests Dart snapshotting')
+  parser.add_argument("--build-dir",
+                      dest="build_dir",
+                      metavar="<build-directory>",
+                      type=str,
+                      required=True,
+                      help="The directory containing the Mojo build.")
+  args = parser.parse_args()
+  dart_snapshotter = os.path.join(args.build_dir, 'dart_snapshotter')
+  package_root = os.path.join(args.build_dir, 'gen', 'dart-pkg', 'packages')
+  main_dart = os.path.join(
+      args.build_dir, 'gen', 'dart-pkg', 'hello', 'main.dart')
+  snapshot = tempfile.mktemp()
+
+  if not os.path.isfile(dart_snapshotter):
+    print "file not found: " + dart_snapshotter
+    return 1
+  subprocess.check_call([
+    dart_snapshotter,
+    main_dart,
+    '--package-root=%s' % package_root,
+    '--snapshot=%s' % snapshot,
+  ])
+  if not os.path.isfile(snapshot):
+    return 1
+
+if __name__ == '__main__':
+  sys.exit(main())