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..40390544b5810c509d86ae79a74d4f61e2e49762
--- /dev/null
+++ b/examples/dart/example_tests.py
@@ -0,0 +1,59 @@
+#!/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"""
+
+# This script runs tests of example Dart Mojo apps.
+# It looks for files named *_test.dart under subdirectories of
+# //examples/dart in the EXAMPLES list, below. These tests are
+# passed a command line argument --mojo-shell /path/to/mojo_shell that they
+# can use to run the example.
+
+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 subdirectories of //examples/dart here.
+EXAMPLES = ['hello_world', 'wget']
+
+def FindTests(example):
+  tests = []
+  for root, _, files in os.walk(os.path.join(SCRIPT_DIR, example)):
+    for f in files:
+      if f.endswith('_test.dart'):
+        tests.append(os.path.join(root, f))
+  return tests
+
+def RunTests(tests, build_dir, package_root):
+  for test in tests:
+    test_path = os.path.join(SCRIPT_DIR, test)
+    subprocess.check_call(
+        [DART, '-p', package_root, '--checked', test_path,
+         '--mojo-shell', os.path.join(build_dir, 'mojo_shell'),])
+
+def main(build_dir, package_root):
+  for example in EXAMPLES:
+    tests = FindTests(example)
+    RunTests(tests, build_dir, package_root)
+
+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))