test_chat_prompt_template_message_class_tuples_static_text() — langchain Function Reference

Source Code

libs/core/tests/unit_tests/prompts/test_chat.py lines 414–429

def test_chat_prompt_template_message_class_tuples_static_text() -> None:
    """Test message class tuples with no template variables (static text)."""
    template = ChatPromptTemplate.from_messages(
        [
            (SystemMessage, "You are a helpful assistant."),
            (HumanMessage, "Hello there!"),
            (AIMessage, "Hi! How can I help?"),
        ]
    )

    messages = template.format_messages()

    assert len(messages) == 3
    assert messages[0].content == "You are a helpful assistant."
    assert messages[1].content == "Hello there!"
    assert messages[2].content == "Hi! How can I help?"