test_chat_prompt_message_placeholder_tuple() — langchain Function Reference

Architecture documentation for the test_chat_prompt_message_placeholder_tuple() function in test_chat.py from the langchain codebase.

Function python LangChainCore LanguageModelBase

Entity Profile

LangChainCore→ LanguageModelBase→ test_chat_prompt_message_placeholder_tuple() — langchain Function Reference

Dependency Diagram

graph TD
  7b3b134d_02f2_c7bd_b3f2_3af743669cc3["test_chat_prompt_message_placeholder_tuple()"]
  00c8bbe0_a31c_1ac8_487a_bfd5a9d6b117["test_chat.py"]
  7b3b134d_02f2_c7bd_b3f2_3af743669cc3 -->|defined in| 00c8bbe0_a31c_1ac8_487a_bfd5a9d6b117
  style 7b3b134d_02f2_c7bd_b3f2_3af743669cc3 fill:#6366f1,stroke:#818cf8,color:#fff

Relationship Graph

Source Code

libs/core/tests/unit_tests/prompts/test_chat.py lines 1092–1106

def test_chat_prompt_message_placeholder_tuple() -> None:
    prompt = ChatPromptTemplate([("placeholder", "{convo}")])
    assert prompt.format_messages(convo=[("user", "foo")]) == [
        HumanMessage(content="foo")
    ]

    assert prompt.format_messages() == []

    # Is optional = True
    optional_prompt = ChatPromptTemplate([("placeholder", ["{convo}", False])])
    assert optional_prompt.format_messages(convo=[("user", "foo")]) == [
        HumanMessage(content="foo")
    ]
    with pytest.raises(KeyError):
        assert optional_prompt.format_messages() == []