test_chat_prompt_template_message_class_tuples_multiple_variables() — langchain Function Reference

Source Code

libs/core/tests/unit_tests/prompts/test_chat.py lines 381–396

def test_chat_prompt_template_message_class_tuples_multiple_variables() -> None:
    """Test message class tuples with multiple template variables."""
    template = ChatPromptTemplate.from_messages(
        [
            (SystemMessage, "You are {name}, a {role} assistant."),
            (HumanMessage, "My question about {topic} is: {question}"),
        ]
    )

    messages = template.format_messages(
        name="Bob", role="helpful", topic="Python", question="What is a list?"
    )

    assert len(messages) == 2
    assert messages[0].content == "You are Bob, a helpful assistant."
    assert messages[1].content == "My question about Python is: What is a list?"