test_normalize_messages_v1_content_blocks_unchanged() — langchain Function Reference

Source Code

libs/core/tests/unit_tests/language_models/chat_models/test_base.py lines 840–876

def test_normalize_messages_v1_content_blocks_unchanged() -> None:
    """Test passing v1 content blocks to `_normalize_messages()` leaves unchanged."""
    input_messages = [
        HumanMessage(
            content=[
                {
                    "type": "text",
                    "text": "Hello world",
                },
                {
                    "type": "image",
                    "url": "https://example.com/image.png",
                    "mime_type": "image/png",
                },
                {
                    "type": "audio",
                    "base64": "base64encodedaudiodata",
                    "mime_type": "audio/wav",
                },
                {
                    "type": "file",
                    "id": "file_123",
                },
                {
                    "type": "reasoning",
                    "reasoning": "Let me think about this...",
                },
            ]
        )
    ]

    result = _normalize_messages(input_messages)

    # Verify the result is identical to the input (message should not be copied)
    assert len(result) == 1
    assert result[0] is input_messages[0]
    assert result[0].content == input_messages[0].content