test_fstring_template_allowed() — langchain Function Reference

Architecture documentation for the test_fstring_template_allowed() function in test_serializable.py from the langchain codebase.

Function python LangChainCore ApiManagement

Entity Profile

LangChainCore→ ApiManagement→ test_fstring_template_allowed() — langchain Function Reference

Dependency Diagram

graph TD
  2db10c8c_09be_b235_8f07_6f3a3e4433f3["test_fstring_template_allowed()"]
  6eac7a3c_5af8_e95a_bd3e_ee52ea07b9b0["TestJinja2SecurityBlocking"]
  2db10c8c_09be_b235_8f07_6f3a3e4433f3 -->|defined in| 6eac7a3c_5af8_e95a_bd3e_ee52ea07b9b0
  style 2db10c8c_09be_b235_8f07_6f3a3e4433f3 fill:#6366f1,stroke:#818cf8,color:#fff

Relationship Graph

Source Code

libs/core/tests/unit_tests/load/test_serializable.py lines 718–769

    def test_fstring_template_allowed(self) -> None:
        """Test that f-string templates deserialize successfully."""
        # Serialized ChatPromptTemplate with f-string format
        serialized = {
            "lc": 1,
            "type": "constructor",
            "id": ["langchain", "prompts", "chat", "ChatPromptTemplate"],
            "kwargs": {
                "input_variables": ["name"],
                "messages": [
                    {
                        "lc": 1,
                        "type": "constructor",
                        "id": [
                            "langchain",
                            "prompts",
                            "chat",
                            "HumanMessagePromptTemplate",
                        ],
                        "kwargs": {
                            "prompt": {
                                "lc": 1,
                                "type": "constructor",
                                "id": [
                                    "langchain",
                                    "prompts",
                                    "prompt",
                                    "PromptTemplate",
                                ],
                                "kwargs": {
                                    "input_variables": ["name"],
                                    "template": "Hello {name}",
                                    "template_format": "f-string",
                                },
                            }
                        },
                    }
                ],
            },
        }

        # f-string should deserialize successfully
        loaded = load(
            serialized,
            allowed_objects=[
                ChatPromptTemplate,
                HumanMessagePromptTemplate,
                PromptTemplate,
            ],
        )
        assert isinstance(loaded, ChatPromptTemplate)
        assert loaded.input_variables == ["name"]