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Tools/appengine_testing/appengine_testing.py

Index: Tools/appengine_testing/appengine_testing.py
diff --git a/Tools/appengine_testing/appengine_testing.py b/Tools/appengine_testing/appengine_testing.py
new file mode 100644
index 0000000000000000000000000000000000000000..6797a5ed6ba1faeef88ed33de94304442a7e0d54
--- /dev/null
+++ b/Tools/appengine_testing/appengine_testing.py
@@ -0,0 +1,54 @@
+# Copyright 2014 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 imp
+import os
+import sys
+
+
+_gae_sdk_root_not_set_message = '''
+    You must set the environment variable GAE_SDK_ROOT to point to the
+    root of your google_appengine SDK installation.'''
+
+
+_webtest_not_installed_message = '''
+    Could not load webtest python module. You may need to:
+    sudo apt-get python-webtest
+'''
+
+
+def set_up():
+    """Sets up the environment for testing AppEngine services.
+
+    Checks, then configures the environment and sys.path to include
+    AppEngine libraries. Call this before importing test modules.
+
+    Raises:
+        AssertionError: the GAE_SDK_ROOT environment variable is not
+            set.
+        ImportError: webtest or AppEngine's wrapper_util could not be
+            imported.
+    """
+    assert 'GAE_SDK_ROOT' in os.environ, _gae_sdk_root_not_set_message
+    os.environ.setdefault('APPENGINE_RUNTIME', 'python27')
+
+    try:
+        wrapper_util = imp.load_module(
+            'wrapper_util', *imp.find_module(
+                'wrapper_util', [os.environ['GAE_SDK_ROOT']]))
+    except ImportError:
+        message = ('GAE_SDK_ROOT=%s does not look like the root of an '
+                   'AppEngine SDK installation') % os.environ['GAE_SDK_ROOT']
+        print >> sys.stderr, message
+        raise
+
+    extra_paths = wrapper_util.Paths(os.environ['GAE_SDK_ROOT']).v2_extra_paths
+    sys.path = extra_paths + sys.path
+
+    # Check that WebTest is installed. Handler integration tests use WebTest.
+    try:
+        import webtest
+    except ImportError:
+        print >> sys.stderr, _webtest_not_installed_message
+        raise