test_from_file_encoding() — langchain Function Reference

Architecture documentation for the test_from_file_encoding() function in test_prompt.py from the langchain codebase.

Function python CoreAbstractions RunnableInterface

Entity Profile

CoreAbstractions→ RunnableInterface→ test_from_file_encoding() — langchain Function Reference

Dependency Diagram

graph TD
  868ff224_c6e6_f412_78b1_aa371af28ba1["test_from_file_encoding()"]
  af1b998b_a7bf_9d5c_32ef_bab507a6bee3["test_prompt.py"]
  868ff224_c6e6_f412_78b1_aa371af28ba1 -->|defined in| af1b998b_a7bf_9d5c_32ef_bab507a6bee3
  style 868ff224_c6e6_f412_78b1_aa371af28ba1 fill:#6366f1,stroke:#818cf8,color:#fff

Relationship Graph

Source Code

libs/core/tests/unit_tests/prompts/test_prompt.py lines 30–48

def test_from_file_encoding() -> None:
    """Test that we can load a template from a file with a non utf-8 encoding."""
    template = "This is a {foo} test with special character €."
    input_variables = ["foo"]

    # First write to a file using CP-1252 encoding.
    with NamedTemporaryFile(delete=True, mode="w", encoding="cp1252") as f:
        f.write(template)
        f.flush()
        file_name = f.name

        # Now read from the file using CP-1252 encoding and test
        prompt = PromptTemplate.from_file(file_name, encoding="cp1252")
        assert prompt.template == template
        assert prompt.input_variables == input_variables

        # Now read from the file using UTF-8 encoding and test
        with pytest.raises(UnicodeDecodeError):
            PromptTemplate.from_file(file_name, encoding="utf-8")