diff --git a/tests/test_api.py b/tests/test_api.py
new file mode 100644
index 0000000..1f6cfb2
--- /dev/null
+++ b/tests/test_api.py
@@ -0,0 +1,45 @@
+import pytest
+import pytest_asyncio
+from httpx import AsyncClient, ASGITransport
+from uuid import uuid4
+
+from geo_assistant.api.app import app
+from geo_assistant.agent.graph import create_graph
+
+
+@pytest_asyncio.fixture
+async def initialized_app():
+    """Initialize the app's chatbot before testing"""
+    # Manually initialize the chatbot as the lifespan would
+    app.state.chatbot = await create_graph()
+    yield app
+    # Cleanup if needed
+    if hasattr(app.state, "chatbot"):
+        del app.state.chatbot
+
+
+@pytest.mark.asyncio
+async def test_hello_world(initialized_app):
+    """Hello world test for the API"""
+    async with AsyncClient(
+        transport=ASGITransport(app=initialized_app), base_url="http://test"
+    ) as client:
+        thread_id = uuid4()
+        response = await client.post(
+            "/chat",
+            json={
+                "agent_state_input": {
+                    "messages": [{"content": "Hello, world!", "type": "human"}],
+                    "place": None,
+                },
+                "thread_id": str(thread_id),
+            },
+        )
+
+        assert response.status_code == 200
+        assert response.headers["content-type"] == "application/x-ndjson; charset=utf-8"
+
+        # Read the streaming response
+        content = response.text
+        assert content is not None
+        assert len(content) > 0