test_prompt_falsy_vars() — langchain Function Reference

Architecture documentation for the test_prompt_falsy_vars() function in test_prompt.py from the langchain codebase.

Function python CoreAbstractions Serialization

Entity Profile

CoreAbstractions→ Serialization→ test_prompt_falsy_vars() — langchain Function Reference

Dependency Diagram

graph TD
  34524317_6e6f_c4bd_6d0e_23b51fe51d98["test_prompt_falsy_vars()"]
  af1b998b_a7bf_9d5c_32ef_bab507a6bee3["test_prompt.py"]
  34524317_6e6f_c4bd_6d0e_23b51fe51d98 -->|defined in| af1b998b_a7bf_9d5c_32ef_bab507a6bee3
  style 34524317_6e6f_c4bd_6d0e_23b51fe51d98 fill:#6366f1,stroke:#818cf8,color:#fff

Relationship Graph

Source Code

libs/core/tests/unit_tests/prompts/test_prompt.py lines 627–648

def test_prompt_falsy_vars(
    template_format: PromptTemplateFormat,
    value: Any,
    expected: str | dict[str, str],
) -> None:
    # each line is value, f-string, mustache
    if template_format == "f-string":
        template = "{my_var}"
    elif template_format == "mustache":
        template = "{{my_var}}"
    else:
        msg = f"Invalid template format: {template_format}"
        raise ValueError(msg)

    prompt = PromptTemplate.from_template(template, template_format=template_format)

    result = prompt.invoke({"my_var": value})

    expected_output = (
        expected if not isinstance(expected, dict) else expected[template_format]
    )
    assert result.to_string() == expected_output