Enable pytest-asyncio tests in CI (#3)

* Set asyncio_mode="auto" in pytest.ini config

Xref https://pytest-asyncio.readthedocs.io/en/latest/reference/configuration.html#asyncio-mode

* Add test-python GitHub Actions CI workflow

* Add `--color=yes` flag to force GitHub Actions logs to have color

Xref https://github.com/pytest-dev/pytest/issues/7443

* Refactor contents of test_api.py slightly

Using some ruff rules

* Delete test_api.py

* Make test_get_place async

* Make get_place async, and call .ainvoke method on it

tests/test_api.py

@@ -1,45 +0,0 @@
-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"}],
-                    "feature_collection": 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