Dart: Adds tests of a couple Dart examples.

examples/dart/example_tests.py

Index: examples/dart/example_tests.py
diff --git a/examples/dart/example_tests.py b/examples/dart/example_tests.py
new file mode 100755
index 0000000000000000000000000000000000000000..3f49e5e03e24bee7601c7ceb614117987c8f95f1
--- /dev/null
+++ b/examples/dart/example_tests.py
@@ -0,0 +1,42 @@
+#!/usr/bin/env python
+# Copyright 2016 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.
+
+"""Runs Dart example tests"""
+
+import argparse
+import os
+import subprocess
+import sys
+
+SCRIPT_DIR = os.path.dirname(os.path.abspath(__file__))
+SRC_DIR = os.path.dirname(os.path.dirname(SCRIPT_DIR))
+
+DART_SDK = os.path.join(SRC_DIR, 'third_party', 'dart-sdk', 'dart-sdk', 'bin')
+DART = os.path.join(DART_SDK, 'dart')
+
+# Add paths to test scripts here relative to //examples/dart.
+TESTS = [
+  os.path.join('hello_world', 'hello', 'test', 'hello_test.dart'),
+  os.path.join('wget', 'test', 'wget_test.dart'),

[Cutch, 2016/01/11 21:10:58]

I'd prefer to just list the directory:

TESTS = [ 'hello_world', 'wget' ]

And then os.walk to discover all the *_test.dart files under the examples
directory.

This way anyone writing an example can just add some tests without having to
update this script.

[zra, 2016/01/11 22:11:18]

Done.

+]
+
+def main(build_dir, package_root):
+  for test in TESTS:
+    subprocess.check_call(
+        [DART, '-p', package_root, '--checked', os.path.join(SCRIPT_DIR, test),
+         '--mojo-shell', os.path.join(build_dir, 'mojo_shell'),])
+
+if __name__ == '__main__':
+  parser = argparse.ArgumentParser(description="Run Dart example tests")
+  parser.add_argument('-b', '--build-dir',
+                      dest='build_dir',
+                      metavar='<build-directory>',
+                      type=str,
+                      required=True,
+                      help='The build output directory. E.g. out/Debug')
+  args = parser.parse_args()
+  package_root = os.path.join(
+      SRC_DIR, args.build_dir, 'gen', 'dart-pkg', 'packages')
+  sys.exit(main(args.build_dir, package_root))