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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_v1.py from the langchain codebase.

Function python LangChainCore Runnables calls 2

Entity Profile

Dependency Diagram

graph TD
  27442f0d_99fb_ef73_02c6_ca9504b43c9d["test_event_stream_on_chain_with_tool()"]
  8ff41f3c_f250_f8de_8094_4f24860a10e0["test_runnable_events_v1.py"]
  27442f0d_99fb_ef73_02c6_ca9504b43c9d -->|defined in| 8ff41f3c_f250_f8de_8094_4f24860a10e0
  aac0453e_34cd_4dce_c7fa_f176ab20140b["_collect_events()"]
  27442f0d_99fb_ef73_02c6_ca9504b43c9d -->|calls| aac0453e_34cd_4dce_c7fa_f176ab20140b
  6ebe7fde_6e8f_dae5_d42f_9cea181617f5["_assert_events_equal_allow_superset_metadata()"]
  27442f0d_99fb_ef73_02c6_ca9504b43c9d -->|calls| 6ebe7fde_6e8f_dae5_d42f_9cea181617f5
  style 27442f0d_99fb_ef73_02c6_ca9504b43c9d fill:#6366f1,stroke:#818cf8,color:#fff

Relationship Graph

Source Code

libs/core/tests/unit_tests/runnables/test_runnable_events_v1.py lines 1429–1524

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]

    # For whatever reason type annotations fail here because reverse
    # does not appear to be a runnable
    chain = concat | reverse

    events = await _collect_events(
        chain.astream_events({"a": "hello", "b": "world"}, version="v1")
    )
    _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",

Domain

Subdomains

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_v1.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_v1.py at line 1429.
What does test_event_stream_on_chain_with_tool() call?
test_event_stream_on_chain_with_tool() calls 2 function(s): _assert_events_equal_allow_superset_metadata, _collect_events.

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