test_runnable_branch_init() — langchain Function Reference

Architecture documentation for the test_runnable_branch_init() function in test_runnable.py from the langchain codebase.

Function python LangChainCore Runnables

Entity Profile

LangChainCore→ Runnables→ test_runnable_branch_init() — langchain Function Reference

Dependency Diagram

graph TD
  7bcb403c_b17d_f486_c77a_17fea1c2292e["test_runnable_branch_init()"]
  26df6ad8_0189_51d0_c3c1_6c3248893ff5["test_runnable.py"]
  7bcb403c_b17d_f486_c77a_17fea1c2292e -->|defined in| 26df6ad8_0189_51d0_c3c1_6c3248893ff5
  style 7bcb403c_b17d_f486_c77a_17fea1c2292e fill:#6366f1,stroke:#818cf8,color:#fff

Relationship Graph

Source Code

libs/core/tests/unit_tests/runnables/test_runnable.py lines 4459–4474

def test_runnable_branch_init() -> None:
    """Verify that runnable branch gets initialized properly."""
    add = RunnableLambda[int, int](lambda x: x + 1)
    condition = RunnableLambda[int, bool](lambda x: x > 0)

    # Test failure with less than 2 branches
    with pytest.raises(
        ValueError, match="RunnableBranch requires at least two branches"
    ):
        RunnableBranch((condition, add))

    # Test failure with less than 2 branches
    with pytest.raises(
        ValueError, match="RunnableBranch requires at least two branches"
    ):
        RunnableBranch(condition)