public void MSOXWSSYNC_S02_TC07_SyncFolderItems_PostItemType()
        {
            #region Step 1. Client invokes SyncFolderItems operation to get initial syncState of inbox folder and verify related requirements.
            DistinguishedFolderIdNameType inboxFolder = DistinguishedFolderIdNameType.inbox;

            // Call SyncFolderItems operation with invalid SyncState to verify the error code: ErrorInvalidSyncStateData
            SyncFolderItemsType requestWithInvalidSyncState = this.CreateSyncFolderItemsRequestWithoutOptionalElements(inboxFolder, DefaultShapeNamesType.AllProperties);

            // The SyncState element data, encoded with base64 encoding, is set to an invalid value
            requestWithInvalidSyncState.SyncState = TestSuiteBase.InvalidSyncState;
            SyncFolderItemsResponseType responseWithInvalidSyncState = this.SYNCAdapter.SyncFolderItems(requestWithInvalidSyncState);

            // Add the debug information
            Site.Log.Add(LogEntryKind.Debug, "Verify MS-OXWSSYNC_R518");

            // Verify MS-OXWSSYNC requirement: MS-OXWSSYNC_R518
            Site.CaptureRequirementIfAreEqual<ResponseCodeType>(
                ResponseCodeType.ErrorInvalidSyncStateData,
                responseWithInvalidSyncState.ResponseMessages.Items[0].ResponseCode,
                "MS-OXWSCDATA",
                518,
                @"[In m:ResponseCodeType Simple Type] [ErrorInvalidSyncStateData: ] This is returned by the SyncFolderItems method if the SyncState property data is invalid.");

            SyncFolderItemsType request = this.CreateSyncFolderItemsRequestWithoutOptionalElements(inboxFolder, DefaultShapeNamesType.AllProperties);
            SyncFolderItemsResponseType response = this.SYNCAdapter.SyncFolderItems(request);
            SyncFolderItemsResponseMessageType responseMessage = TestSuiteHelper.EnsureResponse<SyncFolderItemsResponseMessageType>(response);
            #endregion

            #region Step 2. Client invokes CreateItem create a PostItemType item and get its ID.
            PostItemType postItem = new PostItemType();
            BaseItemIdType[] itemIds = this.CreateItem(inboxFolder, postItem);
            #endregion

            #region Step 3. Client invokes SyncFolderItems operation with previous SyncState to sync the operation result in Step 2 and verify related requirements.
            responseMessage = this.GetResponseMessage(inboxFolder, responseMessage, DefaultShapeNamesType.AllProperties);

            // Assert the changes in response is not null
            Site.Assert.IsNotNull(responseMessage.Changes, "There is one item created on server, so the changes between server and client should not be null");
            SyncFolderItemsChangesType changes = responseMessage.Changes;

            // Assert both the Items and ItemsElementName are not null
            Site.Assert.IsNotNull(changes.ItemsElementName, "There should be changes information returned in SyncFolderItems response since there is one item created on server.");
            Site.Assert.IsNotNull(changes.Items, "There should be item information returned in SyncFolderItems response since there is one item created on server.");

            Site.Assert.AreEqual<int>(1, changes.Items.Length, "Just one PostItemType item was created in previous step, so the count of Items array in responseMessage.Changes should be 1.");

            // If the type of item in SyncFolderItems response is PostItemType, then requirement MS-OXWSSYNC_R174 can be captured.
            // Add the debug information
            Site.Log.Add(LogEntryKind.Debug, "Verify MS-OXWSSYNC_R174");

            // Verify MS-OXWSSYNC requirement: MS-OXWSSYNC_R174
            Site.CaptureRequirementIfIsInstanceOfType(
                (changes.Items[0] as SyncFolderItemsCreateOrUpdateType).Item,
                typeof(PostItemType),
                174,
                @"[In t:SyncFolderItemsCreateOrUpdateType Complex Type] The type of PostItem is t:PostItemType ([MS-OXWSPOST] section 2.2.4.1).");

            // Assert both the length of responseMessage.Changes.ItemsElementName and responseMessage.Changes.Items are 1.
            Site.Assert.AreEqual<int>(1, changes.ItemsElementName.Length, "Just one PostItemType item was created in previous step, so the count of ItemsElementName array in responseMessage.Changes should be 1.");

            bool isPostItemCreated = changes.ItemsElementName[0] == ItemsChoiceType1.Create &&
                        (changes.Items[0] as SyncFolderItemsCreateOrUpdateType).Item.GetType() == typeof(PostItemType);

            // Add the debug information
            Site.Log.Add(
                LogEntryKind.Debug,
                "Verify MS-OXWSSYNC_R1751. Expected value: ItemsElementName: {0}, item type: {1}; actual value: ItemsElementName: {2}, item type: {3}",
                ItemsChoiceType1.Create,
                typeof(PostItemType),
                changes.ItemsElementName[0],
                (changes.Items[0] as SyncFolderItemsCreateOrUpdateType).Item.GetType());

            // If the ItemsElementName of Changes is Create and the type of Item is PostItemType, it indicates a post item 
            // has been created on server and synced on client, then requirement MS-OXWSSYNC_R1751 can be captured.
            // Verify MS-OXWSSYNC requirement: MS-OXWSSYNC_R1751
            Site.CaptureRequirementIfIsTrue(
                isPostItemCreated,
                1751,
                @"[In t:SyncFolderItemsCreateOrUpdateType Complex Type] [The element PostItem] specifies a post item to create in the client message store.");
            #endregion

            #region Step 4. Client invokes UpdateItem operation to update the created item which created in Step 2.
            // Generate a new item subject
            string newItemSubject = Common.GenerateResourceName(this.Site, inboxFolder + "NewItemSubject");
            this.UpdateItemSubject(itemIds, newItemSubject);
            #endregion

            #region Step 5. Client invokes SyncFolderItems operation with previous SyncState to sync the operation result in Step 4 and verify related requirements.
            responseMessage = this.GetResponseMessage(inboxFolder, responseMessage, DefaultShapeNamesType.AllProperties);

            // Assert the changes in response is not null
            Site.Assert.IsNotNull(responseMessage.Changes, "There is one item updated on server, so the changes between server and client should not be null");
            changes = responseMessage.Changes;

            // Assert both the Items and ItemsElementName are not null
            Site.Assert.IsNotNull(changes.ItemsElementName, "There should be changes information returned in SyncFolderItems response since there is one item updated on server.");
            Site.Assert.IsNotNull(changes.Items, "There should be item information returned in SyncFolderItems response since there is one item updated on server.");

            Site.Assert.AreEqual<int>(1, changes.Items.Length, "Just one PostItemType item was updated in previous step, so the count of Items array in responseMessage.Changes should be 1.");
            bool isLastItemIncluded = responseMessage.IncludesLastItemInRange &&
               ((changes.Items[0] as SyncFolderItemsCreateOrUpdateType).Item.GetType() == typeof(PostItemType));

            // Since the last updated item is a post item, if the IncludesLastItemInRange element in SyncFolderItems response is TRUE 
            // and the items in Changes contains PostItemType item, then requirement MS-OXWSSYNC_R6701 can be captured.
            // Add the debug information
            Site.Log.Add(
                LogEntryKind.Debug,
                "Verify MS-OXWSSYNC_R6701. Expected value: IncludesLastItemInRange: 'true', item type: {0}; actual value: IncludesLastItemInRange: {1}, item type: {2}",
                typeof(PostItemType),
                responseMessage.IncludesLastItemInRange,
                (changes.Items[0] as SyncFolderItemsCreateOrUpdateType).Item.GetType());

            // Verify MS-OXWSSYNC requirement: MS-OXWSSYNC_R6701
            Site.CaptureRequirementIfIsTrue(
                isLastItemIncluded,
                6701,
                @"[In m:SyncFolderItemsResponseMessageType Complex Type] [The element IncludesLastItemInRange] True indicates the last item to synchronize is included in the response.");

            Site.Assert.AreEqual<int>(1, changes.ItemsElementName.Length, "Just one PostItemType item was updated in previous step, so the count of ItemsElementName array in responseMessage.Changes should be 1.");
            bool isPostItemUpdated = changes.ItemsElementName[0] == ItemsChoiceType1.Update
                && (changes.Items[0] as SyncFolderItemsCreateOrUpdateType).Item.GetType() == typeof(PostItemType);

            // Add the debug information
            Site.Log.Add(
                LogEntryKind.Debug,
                "Verify MS-OXWSSYNC_R1752. Expected value: ItemsElementName: {0}, item type: {1}; actual value: ItemsElementName: {2}, item type: {3}",
                ItemsChoiceType1.Update,
                typeof(PostItemType),
                changes.ItemsElementName[0],
                (changes.Items[0] as SyncFolderItemsCreateOrUpdateType).Item.GetType());

            // If the ItemsElementName of Changes is Update and the type of Item is PostItemType, it indicates a post item 
            // has been updated on server and synced on client, then requirement MS-OXWSSYNC_R1752 can be captured.
            // Verify MS-OXWSSYNC requirement: MS-OXWSSYNC_R1752
            Site.CaptureRequirementIfIsTrue(
                isPostItemUpdated,
                1752,
                @"[In t:SyncFolderItemsCreateOrUpdateType Complex Type] [The element PostItem] specifies a post item to update in the client message store.");
            #endregion

            #region Step 6. Client invokes DeleteItem operation to delete the PostItemType item which updated in Step 4.
            this.DeleteItem(itemIds);
            #endregion

            #region Step 7. Client invokes SyncFolderItems operation with previous SyncState to sync the operation result in Step 6.
            responseMessage = this.GetResponseMessage(inboxFolder, responseMessage, DefaultShapeNamesType.AllProperties);

            // Assert the changes in response is not null
            Site.Assert.IsNotNull(responseMessage.Changes, "There is one item deleted on server, so the changes between server and client should not be null");
            changes = responseMessage.Changes;

            // Assert both the Items and ItemsElementName are not null
            Site.Assert.IsNotNull(changes.ItemsElementName, "There should be changes information returned in SyncFolderItems response since there is one item deleted on server.");
            Site.Assert.IsNotNull(changes.Items, "There should be item information returned in SyncFolderItems response since there is one item deleted on server.");

            Site.Assert.AreEqual<int>(1, changes.ItemsElementName.Length, "Just one PostItemType item was deleted in previous step, so the count of ItemsElementName array in responseMessage.Changes should be 1.");
            Site.Assert.IsTrue(
                changes.ItemsElementName[0] == ItemsChoiceType1.Delete,
                string.Format("The responseMessage.Changes.ItemsElementName should be 'Delete', the actual value is '{0}'", changes.ItemsElementName[0]));

            Site.Assert.AreEqual<int>(1, changes.Items.Length, "Just one PostItemType item was deleted in previous step, so the count of Items array in responseMessage.Changes should be 1.");
            Site.Assert.IsTrue(
                changes.Items[0].GetType() == typeof(SyncFolderItemsDeleteType),
                string.Format("The responseMessage.Changes.Items should be an instance of '{0}'.", typeof(SyncFolderItemsDeleteType)));
            #endregion
        }