feat(tests): add unit test for Message schema serialization and promp…

…t loading

src/backend/tests/unit/schema/test_schema_message.py

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+import pytest
+from langchain_core.prompts.chat import ChatPromptTemplate
+
+from langflow.schema.message import Message
+
+
+@pytest.fixture
+def client():
+    pass
+
+
+@pytest.mark.asyncio
+async def test_message_async_prompt_serialization():
+    template = "Hello, {name}!"
+    message = await Message.async_from_template_and_variables(template, name="Langflow")
+    assert message.text == "Hello, Langflow!"
+
+    prompt = message.load_lc_prompt()
+    assert isinstance(prompt, ChatPromptTemplate)
+    assert prompt.messages[0].content == "Hello, Langflow!"
+
+
+def test_message_prompt_serialization():
+    template = "Hello, {name}!"
+    message = Message.from_template_and_variables(template, name="Langflow")
+    assert message.text == "Hello, Langflow!"
+
+    prompt = message.load_lc_prompt()
+    assert isinstance(prompt, ChatPromptTemplate)
+    assert prompt.messages[0].content == "Hello, Langflow!"