initial tests

tests/test_loop.py

@@ -0,0 +1,38 @@
+from unittest.mock import AsyncMock, patch
+
+import pytest
+
+from agent.loop import run_turn
+
+
+@pytest.mark.asyncio
+async def test_run_turn_basic(mock_anthropic_client):
+    """test that run_turn calls the API and returns a message"""
+
+    # patch the client with our mock
+    with patch("agent.loop.client", mock_anthropic_client):
+        result = await run_turn("What is 2+2?")
+
+    # verify client was called
+    mock_anthropic_client.messages.create.assert_called_once()
+
+    # verify message returned
+    assert result.content[0].text == "42"
+
+    # verify call has correct parameters
+    call_args = mock_anthropic_client.messages.create.call_args
+    assert call_args.kwargs["messages"][0]["content"] == "What is 2+2?"
+
+
+@pytest.mark.asyncio
+async def test_run_turn_uses_settings(mock_anthropic_client, settings):
+    """Test that run_turn uses settings correctly."""
+
+    with patch("agent.loop.client", mock_anthropic_client):
+        with patch("agent.loop.settings", settings):
+            await run_turn("test message")
+
+    # Verify settings were used
+    call_args = mock_anthropic_client.messages.create.call_args
+    assert call_args.kwargs["model"] == settings.model
+    assert call_args.kwargs["max_tokens"] == settings.max_tokens