Checkpointing some Sync Attachment work. Added SyncAttachment and SyncAttachmentId.

sync/api/sync_attachment_unittest.cc

+// Copyright 2013 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.
+
+#include "sync/api/sync_attachment.h"
+
+#include <string>
+
+#include "base/memory/ref_counted.h"
+#include "base/memory/ref_counted_memory.h"
+#include "base/memory/scoped_ptr.h"
+#include "sync/protocol/sync.pb.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+using sync_pb::SyncAttachmentId;
+
+namespace syncer {
+
+namespace {
+
+const char kAttachmentData[] = "some data";
+
+typedef testing::Test SyncAttachmentTest;
+
+TEST_F(SyncAttachmentTest, Create_UniqueIdIsUnique) {
+  SyncAttachmentId id;
+  scoped_refptr<base::RefCountedString> bytes(new base::RefCountedString);
+  bytes->data() = kAttachmentData;
+  scoped_ptr<SyncAttachment> a1 = SyncAttachment::Create(bytes);
+  scoped_ptr<SyncAttachment> a2 = SyncAttachment::Create(bytes);
+  EXPECT_NE(a1->GetId().unique_id(), a2->GetId().unique_id());
+  EXPECT_EQ(a1->GetBytes(), a2->GetBytes());
+}
+
+TEST_F(SyncAttachmentTest, Create_WithEmptyBytes) {
+  SyncAttachmentId id;
+  scoped_refptr<base::RefCountedString> emptyBytes(new base::RefCountedString);
+  scoped_ptr<SyncAttachment> a = SyncAttachment::Create(emptyBytes);
+  EXPECT_EQ(emptyBytes, a->GetBytes());
+}
+
+TEST_F(SyncAttachmentTest, CreateWithId_HappyCase) {
+  SyncAttachmentId id;
+  id.set_unique_id("3290482049832");
+  scoped_refptr<base::RefCountedString> bytes(new base::RefCountedString);
+  bytes->data() = kAttachmentData;
+  scoped_ptr<SyncAttachment> a = SyncAttachment::CreateWithId(id, bytes);
+  EXPECT_EQ(id.unique_id(), a->GetId().unique_id());
+  EXPECT_EQ(bytes, a->GetBytes());
+}
+
+}  // namespace
+
+}  // namespace syncer