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47 lines
1.6 KiB
Python
47 lines
1.6 KiB
Python
"""Test LLM callbacks."""
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from langchain.schema import HumanMessage
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from tests.unit_tests.callbacks.fake_callback_handler import (
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FakeCallbackHandler,
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FakeCallbackHandlerWithChatStart,
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)
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from tests.unit_tests.llms.fake_chat_model import FakeChatModel
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from tests.unit_tests.llms.fake_llm import FakeLLM
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def test_llm_with_callbacks() -> None:
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"""Test LLM callbacks."""
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handler = FakeCallbackHandler()
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llm = FakeLLM(callbacks=[handler], verbose=True)
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output = llm("foo")
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assert output == "foo"
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assert handler.starts == 1
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assert handler.ends == 1
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assert handler.errors == 0
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def test_chat_model_with_v1_callbacks() -> None:
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"""Test chat model callbacks fall back to on_llm_start."""
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handler = FakeCallbackHandler()
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llm = FakeChatModel(callbacks=[handler], verbose=True)
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output = llm([HumanMessage(content="foo")])
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assert output.content == "fake response"
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assert handler.starts == 1
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assert handler.ends == 1
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assert handler.errors == 0
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assert handler.llm_starts == 1
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assert handler.llm_ends == 1
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def test_chat_model_with_v2_callbacks() -> None:
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"""Test chat model callbacks fall back to on_llm_start."""
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handler = FakeCallbackHandlerWithChatStart()
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llm = FakeChatModel(callbacks=[handler], verbose=True)
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output = llm([HumanMessage(content="foo")])
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assert output.content == "fake response"
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assert handler.starts == 1
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assert handler.ends == 1
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assert handler.errors == 0
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assert handler.llm_starts == 0
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assert handler.llm_ends == 1
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assert handler.chat_model_starts == 1
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