public void Add_User_Storage_File_Tests_Method()
{
fileStorage.Clear();
var date = DateTimeOffset.Now;
var guid = Guid.NewGuid();
UserItem userItem = new UserItem()
{
ChatId = 123,
DateOfRegistration = date,
FirstName = "Null",
Id = guid,
Message = "Null",
Status = StatusEnum.Null
};
fileStorage.AddUser(userItem);
Assert.AreEqual(fileStorage.Count, 1);
fileStorage.Clear();
}