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test_event_stream_with_single_lambda() — langchain Function Reference

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

Function python LangChainCore Runnables calls 1

Entity Profile

Dependency Diagram

graph TD
  a3a2bed1_7de2_374e_18a8_9a1b2ca43337["test_event_stream_with_single_lambda()"]
  33c02978_2077_5819_7048_bc2a81e80625["test_runnable_events_v2.py"]
  a3a2bed1_7de2_374e_18a8_9a1b2ca43337 -->|defined in| 33c02978_2077_5819_7048_bc2a81e80625
  716d2a5e_dc8e_3cae_e044_b56b06bee655["_collect_events()"]
  a3a2bed1_7de2_374e_18a8_9a1b2ca43337 -->|calls| 716d2a5e_dc8e_3cae_e044_b56b06bee655
  style a3a2bed1_7de2_374e_18a8_9a1b2ca43337 fill:#6366f1,stroke:#818cf8,color:#fff

Relationship Graph

Source Code

libs/core/tests/unit_tests/runnables/test_runnable_events_v2.py lines 188–229

async def test_event_stream_with_single_lambda() -> None:
    """Test the event stream with a tool."""

    def reverse(s: str) -> str:
        """Reverse a string."""
        return s[::-1]

    chain = RunnableLambda(func=reverse)

    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": "reverse",
                "run_id": "",
                "parent_ids": [],
                "tags": [],
            },
            {
                "data": {"chunk": "olleh"},
                "event": "on_chain_stream",
                "metadata": {},
                "name": "reverse",
                "run_id": "",
                "parent_ids": [],
                "tags": [],
            },
            {
                "data": {"output": "olleh"},
                "event": "on_chain_end",
                "metadata": {},
                "name": "reverse",
                "run_id": "",
                "parent_ids": [],
                "tags": [],
            },
        ],
    )

Domain

Subdomains

Defined In

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Source

Frequently Asked Questions

What does test_event_stream_with_single_lambda() do?
test_event_stream_with_single_lambda() 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_single_lambda() defined?
test_event_stream_with_single_lambda() is defined in libs/core/tests/unit_tests/runnables/test_runnable_events_v2.py at line 188.
What does test_event_stream_with_single_lambda() call?
test_event_stream_with_single_lambda() calls 1 function(s): _collect_events.

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