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8 | 8 | from unittest.mock import patch |
9 | 9 |
|
10 | 10 | import pytest |
11 | | -from langchain_anthropic.chat_models import ChatAnthropic |
12 | | -from langchain_community.chat_models.fake import FakeMessagesListChatModel |
13 | | -from langchain_community.llms.fake import FakeListLLM, FakeStreamingListLLM |
14 | | -from langchain_core.messages import AIMessage, HumanMessage |
15 | | -from langchain_core.prompts import ChatPromptTemplate |
16 | | -from langchain_core.runnables import RunnableLambda |
17 | | -from langchain_core.tools import tool |
18 | | -from langchain_openai.chat_models import ChatOpenAI |
19 | | -from langgraph.graph.state import END, START, StateGraph |
20 | | -from langgraph.prebuilt import create_react_agent |
21 | | - |
22 | | -from posthog.ai.langchain import CallbackHandler |
23 | | -from posthog.ai.langchain.callbacks import GenerationMetadata, SpanMetadata |
| 11 | + |
| 12 | +try: |
| 13 | + from langchain_anthropic.chat_models import ChatAnthropic |
| 14 | + from langchain_community.chat_models.fake import FakeMessagesListChatModel |
| 15 | + from langchain_community.llms.fake import FakeListLLM, FakeStreamingListLLM |
| 16 | + from langchain_core.messages import AIMessage, HumanMessage |
| 17 | + from langchain_core.prompts import ChatPromptTemplate |
| 18 | + from langchain_core.runnables import RunnableLambda |
| 19 | + from langchain_core.tools import tool |
| 20 | + from langchain_openai.chat_models import ChatOpenAI |
| 21 | + from langgraph.graph.state import END, START, StateGraph |
| 22 | + from langgraph.prebuilt import create_react_agent |
| 23 | + |
| 24 | + from posthog.ai.langchain import CallbackHandler |
| 25 | + from posthog.ai.langchain.callbacks import GenerationMetadata, SpanMetadata |
| 26 | + |
| 27 | + LANGCHAIN_AVAILABLE = True |
| 28 | +except ImportError: |
| 29 | + |
| 30 | + class FakeListLLM: |
| 31 | + pass |
| 32 | + |
| 33 | + class FakeStreamingListLLM: |
| 34 | + pass |
| 35 | + |
| 36 | + class HumanMessage: |
| 37 | + pass |
| 38 | + |
| 39 | + class AIMessage: |
| 40 | + pass |
| 41 | + |
| 42 | + LANGCHAIN_AVAILABLE = False |
| 43 | + |
| 44 | + |
| 45 | +# Skip all tests if LangChain is not available |
| 46 | +pytestmark = pytest.mark.skipif(not LANGCHAIN_AVAILABLE, reason="LangChain package is not available") |
24 | 47 |
|
25 | 48 | OPENAI_API_KEY = os.getenv("OPENAI_API_KEY") |
26 | 49 | ANTHROPIC_API_KEY = os.getenv("ANTHROPIC_API_KEY") |
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