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test_event_stream_on_chain_with_tool() — langchain Function Reference

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

Function python LangChainCore Runnables calls 1

Entity Profile

Dependency Diagram

graph TD
  0adc4024_6629_06b7_068b_90c72d192e54["test_event_stream_on_chain_with_tool()"]
  33c02978_2077_5819_7048_bc2a81e80625["test_runnable_events_v2.py"]
  0adc4024_6629_06b7_068b_90c72d192e54 -->|defined in| 33c02978_2077_5819_7048_bc2a81e80625
  716d2a5e_dc8e_3cae_e044_b56b06bee655["_collect_events()"]
  0adc4024_6629_06b7_068b_90c72d192e54 -->|calls| 716d2a5e_dc8e_3cae_e044_b56b06bee655
  style 0adc4024_6629_06b7_068b_90c72d192e54 fill:#6366f1,stroke:#818cf8,color:#fff

Relationship Graph

Source Code

libs/core/tests/unit_tests/runnables/test_runnable_events_v2.py lines 1390–1483

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

    @tool
    def concat(a: str, b: str) -> str:
        """A tool that does nothing."""
        return a + b

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

    chain = concat | reverse

    events = await _collect_events(
        chain.astream_events({"a": "hello", "b": "world"}, version="v2")
    )
    _assert_events_equal_allow_superset_metadata(
        events,
        [
            {
                "data": {"input": {"a": "hello", "b": "world"}},
                "event": "on_chain_start",
                "metadata": {},
                "name": "RunnableSequence",
                "run_id": "",
                "parent_ids": [],
                "tags": [],
            },
            {
                "data": {"input": {"a": "hello", "b": "world"}},
                "event": "on_tool_start",
                "metadata": {},
                "name": "concat",
                "run_id": "",
                "parent_ids": [],
                "tags": ["seq:step:1"],
            },
            {
                "data": {"input": {"a": "hello", "b": "world"}, "output": "helloworld"},
                "event": "on_tool_end",
                "metadata": {},
                "name": "concat",
                "run_id": "",
                "parent_ids": [],
                "tags": ["seq:step:1"],
            },
            {
                "data": {},
                "event": "on_chain_start",
                "metadata": {},
                "name": "reverse",
                "run_id": "",
                "parent_ids": [],
                "tags": ["seq:step:2"],
            },
            {
                "data": {"chunk": "dlrowolleh"},
                "event": "on_chain_stream",
                "metadata": {},
                "name": "reverse",
                "run_id": "",
                "parent_ids": [],
                "tags": ["seq:step:2"],
            },
            {
                "data": {"chunk": "dlrowolleh"},
                "event": "on_chain_stream",
                "metadata": {},
                "name": "RunnableSequence",
                "run_id": "",
                "parent_ids": [],
                "tags": [],
            },
            {
                "data": {"input": "helloworld", "output": "dlrowolleh"},
                "event": "on_chain_end",
                "metadata": {},
                "name": "reverse",
                "run_id": "",
                "parent_ids": [],

Domain

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Defined In

Calls

Source

Frequently Asked Questions

What does test_event_stream_on_chain_with_tool() do?
test_event_stream_on_chain_with_tool() 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_on_chain_with_tool() defined?
test_event_stream_on_chain_with_tool() is defined in libs/core/tests/unit_tests/runnables/test_runnable_events_v2.py at line 1390.
What does test_event_stream_on_chain_with_tool() call?
test_event_stream_on_chain_with_tool() calls 1 function(s): _collect_events.

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