mirror of https://github.com/hwchase17/langchain
langchain-mongodb: add unit tests for MongoDBChatMessageHistory (#18599)
## Description Adding in Unit Test variation for `MongoDBChatMessageHistory` package Follow-up to #18590 - [x] **Add tests and docs**: Unit test is what's being added - [x] **Lint and test**: Run `make format`, `make lint` and `make test` from the root of the package(s) you've modified. See contribution guidelines for more: https://python.langchain.com/docs/contributing/pull/18605/head
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import json
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from langchain.memory import ConversationBufferMemory
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from langchain_core.messages import message_to_dict
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from langchain_mongodb.chat_message_histories import MongoDBChatMessageHistory
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from tests.utils import MockCollection
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class PatchedMongoDBChatMessageHistory(MongoDBChatMessageHistory):
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def __init__(self) -> None:
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self.session_id = "test-session"
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self.database_name = "test-database"
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self.collection_name = "test-collection"
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self.collection = MockCollection()
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def test_memory_with_message_store() -> None:
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"""Test the memory with a message store."""
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# setup MongoDB as a message store
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message_history = PatchedMongoDBChatMessageHistory()
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memory = ConversationBufferMemory(
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memory_key="baz", chat_memory=message_history, return_messages=True
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)
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# add some messages
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memory.chat_memory.add_ai_message("This is me, the AI")
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memory.chat_memory.add_user_message("This is me, the human")
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# get the message history from the memory store and turn it into a json
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messages = memory.chat_memory.messages
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messages_json = json.dumps([message_to_dict(msg) for msg in messages])
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assert "This is me, the AI" in messages_json
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assert "This is me, the human" in messages_json
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# remove the record from MongoDB, so the next test run won't pick it up
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memory.chat_memory.clear()
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assert memory.chat_memory.messages == []
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