test_prompttemplate_validation() — langchain Function Reference

Source Code

libs/core/tests/unit_tests/prompts/test_few_shot_with_templates.py lines 49–83

def test_prompttemplate_validation() -> None:
    """Test that few shot works when prefix and suffix are PromptTemplates."""
    prefix = PromptTemplate(
        input_variables=["content"], template="This is a test about {content}."
    )
    suffix = PromptTemplate(
        input_variables=["new_content"],
        template="Now you try to talk about {new_content}.",
    )

    examples = [
        {"question": "foo", "answer": "bar"},
        {"question": "baz", "answer": "foo"},
    ]
    with pytest.raises(
        ValueError,
        match=re.escape("Got input_variables=[], but based on prefix/suffix expected"),
    ):
        FewShotPromptWithTemplates(
            suffix=suffix,
            prefix=prefix,
            input_variables=[],
            examples=examples,
            example_prompt=EXAMPLE_PROMPT,
            example_separator="\n",
            validate_template=True,
        )
    assert FewShotPromptWithTemplates(
        suffix=suffix,
        prefix=prefix,
        input_variables=[],
        examples=examples,
        example_prompt=EXAMPLE_PROMPT,
        example_separator="\n",
    ).input_variables == ["content", "new_content"]