sync: Refactor NonBlockingTypeProcessorCore tests

sync/test/engine/single_type_mock_server.h

Index: sync/test/engine/single_type_mock_server.h
diff --git a/sync/test/engine/single_type_mock_server.h b/sync/test/engine/single_type_mock_server.h
new file mode 100644
index 0000000000000000000000000000000000000000..39ad35c77fc1fcff95b89d6484cd6ffe7fcf2ad5
--- /dev/null
+++ b/sync/test/engine/single_type_mock_server.h
@@ -0,0 +1,94 @@
+// 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.
+
+#ifndef SYNC_TEST_ENGINE_SINGLE_TYPE_MOCK_SERVER_H_
+#define SYNC_TEST_ENGINE_SINGLE_TYPE_MOCK_SERVER_H_
+
+#include "sync/engine/non_blocking_sync_common.h"
+
+#include "sync/internal_api/public/base/model_type.h"
+
+namespace syncer {
+
+// A mock server used to test of happy-path update and commit logic.
+//
+// This object supports only one ModelType, which must be specified at
+// initialization time.  It does not support GetUpdates messages.  It does not
+// support simulated errors.
+//
+// This class is useful for testing UpdateHandlers and CommitContributors.
+class SingleTypeMockServer {
+ public:
+  explicit SingleTypeMockServer(syncer::ModelType type);
+  ~SingleTypeMockServer();
+
+  // Generates a SyncEntity representing a server-delivered update containing
+  // the root node for this SingleTypeMockServer's type.
+  sync_pb::SyncEntity TypeRootUpdate();
+
+  // Generates a SyncEntity representing a server-delivered update.
+  //
+  // The |version_offset| parameter allows the caller to simulate reflected
+  // updates, redeliveries, and genuine updates.
+  sync_pb::SyncEntity UpdateFromServer(
+      int64 version_offset,
+      const std::string& tag_hash,
+      const sync_pb::EntitySpecifics& specifics);
+
+  // Generates a SyncEntity representing a server-delivered update to delete
+  // an item.
+  sync_pb::SyncEntity TombstoneFromServer(int64 version_offset,
+                                          const std::string& tag_hash);
+
+  // Generates a response to the specified commit message.
+  //
+  // This does not perform any exhausive testing of the sync protocol.  Many of
+  // the request's fields may safely be left blank, and much of the returned
+  // response will be empty, too.
+  //
+  // This is useful mainly for testing objects that implement the
+  // CommitContributor interface.
+  sync_pb::ClientToServerResponse DoSuccessfulCommit(
+      const sync_pb::ClientToServerMessage& message);
+
+  // Getters to return the commit messages sent to the server through
+  // DoSuccessfulCommit().
+  size_t GetNumCommitMessages() const;
+  sync_pb::ClientToServerMessage GetNthCommitMessage(size_t n) const;
+
+  // Getters to return the most recently committed entities for a given
+  // unique_client_tag hash.
+  bool HasCommitEntity(const std::string& tag_hash) const;
+  sync_pb::SyncEntity GetLastCommittedEntity(const std::string& tag_hash) const;
+
+  // Getters that create realistic-looking progress markers and data type
+  // context.
+  sync_pb::DataTypeProgressMarker GetProgress() const;
+  sync_pb::DataTypeContext GetContext() const;
+
+ private:
+  static std::string GenerateId(const std::string& tag_hash);
+
+  // Get and set our emulated server state.
+  int64 GetServerVersion(const std::string& tag_hash) const;
+  void SetServerVersion(const std::string& tag_hash, int64 version);
+
+  const ModelType type_;
+  const std::string type_root_id_;
+
+  // Server version state maps.
+  std::map<const std::string, int64> server_versions_;
+
+  // Log of messages sent to the server.
+  std::vector<sync_pb::ClientToServerMessage> commit_messages_;
+
+  // Map of most recent commits by tag_hash.
+  std::map<const std::string, sync_pb::SyncEntity> committed_items_;
+
+  DISALLOW_COPY_AND_ASSIGN(SingleTypeMockServer);
+};
+
+}  // namespace syncer
+
+#endif  // SYNC_TEST_ENGINE_SINGLE_TYPE_MOCK_SERVER_H_