Sync: Add DeviceInfo's ChangeProcessor

sync/test/test_transaction_observer.h

+// Copyright (c) 2012 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.
+
+#ifndef SYNC_TEST_TEST_TRANSACTION_OBSERVER_H_
+#define SYNC_TEST_TEST_TRANSACTION_OBSERVER_H_
+
+#include "base/memory/weak_ptr.h"
+#include "sync/internal_api/public/base/model_type.h"
+#include "sync/syncable/transaction_observer.h"
+#include "sync/syncable/write_transaction_info.h"
+
+namespace syncer {
+namespace syncable {
+
+// This class acts as a TransactionObserver for the syncable::Directory.
+// It gathers information that is useful for writing test assertions.
+class TestTransactionObserver :
+  public base::SupportsWeakPtr<TestTransactionObserver>,
+  public TransactionObserver {
+ public:
+  TestTransactionObserver();
+  virtual ~TestTransactionObserver();
+  virtual void OnTransactionWrite(
+      const ImmutableWriteTransactionInfo& write_transaction_info,
+      ModelTypeSet models_with_changes) OVERRIDE;
+
+  // Returns the number of transactions observed.
+  //
+  // Transactions are generated only when meaningful changes are made.  For most
+  // testing purposes, you may assume that this counts the number of syncer
+  // nudges generated.
+  int transactions_observed();
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(TestTransactionObserver);
+
+  int transactions_observed_;
+};
+
+}  // namespace syncable
+}  // namespace syncer
+
+
+#endif  // SYNC_TEST_TEST_TRANSACTION_OBSERVER_H_