How can I add a custom chat history in Langgraph

[HoangNguyen689]

For unit testing, I need to have a chat history first.
With the single agent, it can be done easily through the ChatMessageHistory

with open("chat_history.csv") as f:
    reader = csv.reader(f)
    for row in reader:
        if row:
            if row[0] == "human":
                store.add_user_message(row[1])
            if row[0] == "ai":
                store.add_ai_message(row[1])

How can I do the same stuff with the checkpointer implemented in Langgraph?