     
     func testIdentifier()
     {
-        let users:FDatabaseUsers = FDatabaseUsers()
-        let user:FDatabaseUsersItem = FDatabaseUsersItem(
-            users:users)
+        guard
+            
+            let user:FDatabaseUsersItem = self.user
+            
+        else
+        {
+            return
+        }
+        
         user.identifier = kUserId
         let syncstamp:FDatabaseUsersItemSyncstamp? = FDatabaseUsersItemSyncstamp(
             user:user)


class TFDatabaseUsersItemSyncstamp:XCTestCase
{
    private let kUserId:String = "lorem ipsum"
    
    func testInitNoIdentifier()
    {
        let users:FDatabaseUsers = FDatabaseUsers()
        let user:FDatabaseUsersItem = FDatabaseUsersItem(
            users:users)
        let syncstamp:FDatabaseUsersItemSyncstamp? = FDatabaseUsersItemSyncstamp(
            user:user)
        

    
    func testInitIdentifier()
    {
        guard
            
            let user:FDatabaseUsersItem = self.user
            
        else
        {
            return
        }
        
        user.identifier = kUserId
        let syncstamp:FDatabaseUsersItemSyncstamp? = FDatabaseUsersItemSyncstamp(
            user:user)
