public void TestAddDelete()
{
// 数据存储在文件中，每次运行只测试新加消息。
using ChatHistory ch = new ChatHistory(".", 0, -1, -1);
List <long> addedIds = new List <long>();
for (int i = 0; i < 10; ++i)
{
addedIds.Add(ch.AddMessage("" + i, "" + i));
}
List <long> deletedIds = new List <long>();
foreach (long id in addedIds)
{
if (id % 2 == 0)
{
continue;
}
ch.DeleteMessage(id);
deletedIds.Add(id);
}
for (int i = 0; i < addedIds.Count; ++i)
{
long id = addedIds[i];
List <ChatHistoryMessage> msgs = ch.ReadMessage(id, 1);
Assert.IsTrue(msgs.Count == 1);
ChatHistoryMessage msg = msgs[^ 1];
