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test_event_stream_with_retriever_and_formatter() — langchain Function Reference

Architecture documentation for the test_event_stream_with_retriever_and_formatter() function in test_runnable_events_v2.py from the langchain codebase.

Function python LangChainCore Runnables calls 1

Entity Profile

Dependency Diagram

graph TD
  783f5e81_685a_3bc9_4b43_195563a40885["test_event_stream_with_retriever_and_formatter()"]
  33c02978_2077_5819_7048_bc2a81e80625["test_runnable_events_v2.py"]
  783f5e81_685a_3bc9_4b43_195563a40885 -->|defined in| 33c02978_2077_5819_7048_bc2a81e80625
  716d2a5e_dc8e_3cae_e044_b56b06bee655["_collect_events()"]
  783f5e81_685a_3bc9_4b43_195563a40885 -->|calls| 716d2a5e_dc8e_3cae_e044_b56b06bee655
  style 783f5e81_685a_3bc9_4b43_195563a40885 fill:#6366f1,stroke:#818cf8,color:#fff

Relationship Graph

Source Code

libs/core/tests/unit_tests/runnables/test_runnable_events_v2.py lines 1274–1387

async def test_event_stream_with_retriever_and_formatter() -> None:
    """Test the event stream with a retriever."""
    retriever = HardCodedRetriever(
        documents=[
            Document(
                page_content="hello world!",
                metadata={"foo": "bar"},
            ),
            Document(
                page_content="goodbye world!",
                metadata={"food": "spare"},
            ),
        ]
    )

    def format_docs(docs: list[Document]) -> str:
        """Format the docs."""
        return ", ".join([doc.page_content for doc in docs])

    chain = retriever | format_docs
    events = await _collect_events(chain.astream_events("hello", version="v2"))
    _assert_events_equal_allow_superset_metadata(
        events,
        [
            {
                "data": {"input": "hello"},
                "event": "on_chain_start",
                "metadata": {},
                "name": "RunnableSequence",
                "run_id": "",
                "parent_ids": [],
                "tags": [],
            },
            {
                "data": {"input": {"query": "hello"}},
                "event": "on_retriever_start",
                "metadata": {},
                "name": "HardCodedRetriever",
                "run_id": "",
                "parent_ids": [],
                "tags": ["seq:step:1"],
            },
            {
                "data": {
                    "input": {"query": "hello"},
                    "output": [
                        Document(page_content="hello world!", metadata={"foo": "bar"}),
                        Document(
                            page_content="goodbye world!", metadata={"food": "spare"}
                        ),
                    ],
                },
                "event": "on_retriever_end",
                "metadata": {},
                "name": "HardCodedRetriever",
                "run_id": "",
                "parent_ids": [],
                "tags": ["seq:step:1"],
            },
            {
                "data": {},
                "event": "on_chain_start",
                "metadata": {},
                "name": "format_docs",
                "run_id": "",
                "parent_ids": [],
                "tags": ["seq:step:2"],
            },
            {
                "data": {"chunk": "hello world!, goodbye world!"},
                "event": "on_chain_stream",
                "metadata": {},
                "name": "format_docs",
                "run_id": "",
                "parent_ids": [],
                "tags": ["seq:step:2"],
            },
            {
                "data": {"chunk": "hello world!, goodbye world!"},
                "event": "on_chain_stream",
                "metadata": {},

Domain

Subdomains

Defined In

Calls

Source

Frequently Asked Questions

What does test_event_stream_with_retriever_and_formatter() do?
test_event_stream_with_retriever_and_formatter() is a function in the langchain codebase, defined in libs/core/tests/unit_tests/runnables/test_runnable_events_v2.py.
Where is test_event_stream_with_retriever_and_formatter() defined?
test_event_stream_with_retriever_and_formatter() is defined in libs/core/tests/unit_tests/runnables/test_runnable_events_v2.py at line 1274.
What does test_event_stream_with_retriever_and_formatter() call?
test_event_stream_with_retriever_and_formatter() calls 1 function(s): _collect_events.

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