Refactor au_test_harness into modules and refactor to use worker design.

bin/au_test_harness/dummy_au_worker.py

Index: bin/au_test_harness/dummy_au_worker.py
diff --git a/bin/au_test_harness/dummy_au_worker.py b/bin/au_test_harness/dummy_au_worker.py
new file mode 100644
index 0000000000000000000000000000000000000000..d16cd690f3c8ec41c1bc726d1442ea8cb8764a20
--- /dev/null
+++ b/bin/au_test_harness/dummy_au_worker.py
@@ -0,0 +1,45 @@
+# Copyright (c) 2011 The Chromium OS Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+"""Module containing a fake  au worker class."""
+
+import unittest
+
+import au_worker
+
+class DummyAUWorker(au_worker.AUWorker):
+  """AU worker that emulates work for an au_worker without actually doing work.
+
+  Collects different updates that would be generated that can be obtained
+  from the class object delta_list.
+  """
+
+  # Class variable that stores the list of payloads that would be needed.
+  delta_list = {}
+
+  def __init__(self, options):
+    au_worker.AUWorker.__init__(self, options)
+    self.au_type = options.type
+
+  def PrepareBase(self, image_path):
+    """Copy how the actual worker would prepare the base image."""
+    if self.au_type == 'vm':
+      self.PrepareVMBase(image_path)
+    else:
+      self.PrepareRealBase(image_path)
+
+  def UpdateImage(self, image_path, src_image_path='', stateful_change='old',
+                  proxy_port=None, private_key_path=None):
+    """Emulate Update and record the update payload in delta_list."""
+    if self.au_type == 'vm' and src_image_path and self._first_update:
+      src_image_path = self.vm_image_path
+      self._first_update = False
+
+    # Generate a value that combines delta with private key path.
+    val = src_image_path
+    if private_key_path: val = '%s+%s' % (val, private_key_path)
+    if not self.delta_list.has_key(image_path):
+      self.delta_list[image_path] = set([val])
+    else:
+      self.delta_list[image_path].add(val)