8 System tests, against the run image

@@ -25,6 +25,7 @@ test = [
     "pytest>=9.1.1",
     "pytest-asyncio>=1.4.0",
     "pytest-cov>=7.1.0",
+    "requests>=2.34.2",
 ]
 
 [tool.pytest.ini_options]

@@ -30,7 +30,7 @@ test = [
 
 [tool.pytest.ini_options]
 # The tests are in tests/, and import the package api from src/api-service/
-testpaths = ["tests"]
+testpaths = ["tests/unit", "tests/integration"]
 pythonpath = ["src/api-service"]
 
 [tool.ruff]

@@ -0,0 +1,69 @@
+"""
+System tests of the API server
+Send real HTTP requests to the server at localhost:9000, the deployment
+"""
+
+import pytest
+import requests
+
+
+# Base URL for the API (assumes API is running)
+API_BASE_URL = "http://localhost:9000"
+
+
+@pytest.fixture(scope="module")
+def server():
+    """Fail the tests that use it when no server answers at localhost:9000"""
+    try:
+        requests.get(f"{API_BASE_URL}/health", timeout=2)
+    except requests.RequestException:
+        pytest.fail(f"no server at {API_BASE_URL}: start one with just docker-serve", pytrace=False)
+
+
+@pytest.mark.usefixtures("server")
+class TestAPIEndpoints:
+    """System tests of the endpoints, through the running server"""
+
+    def test_root_endpoint(self):
+        """Test the root endpoint returns welcome message"""
+        response = requests.get(f"{API_BASE_URL}/")
+        assert response.status_code == 200
+        data = response.json()
+        assert "message" in data
+        assert "Cheese App" in data["message"]
+
+    def test_health_check(self):
+        """Test health check endpoint"""
+        response = requests.get(f"{API_BASE_URL}/health")
+        assert response.status_code == 200
+        data = response.json()
+        assert data["status"] == "healthy"
+
+    def test_euclidean_distance_endpoint_default(self):
+        """Test euclidean_distance endpoint with default values"""
+        response = requests.get(f"{API_BASE_URL}/euclidean_distance/")
+        assert response.status_code == 200
+        data = response.json()
+        assert "distance" in data
+        assert data["x"] == 1.0
+        assert data["y"] == 2.0
+        assert data["distance"] == pytest.approx(2.236, rel=0.01)
+
+    def test_euclidean_distance_endpoint_custom_values(self):
+        """Test euclidean_distance endpoint with custom values (3, 4)"""
+        response = requests.get(f"{API_BASE_URL}/euclidean_distance/?x=3&y=4")
+        assert response.status_code == 200
+        data = response.json()
+        assert data["distance"] == pytest.approx(5.0)
+
+
+# Standalone tests that don't require running API
+class TestAPIWithoutServer:
+    """Tests that can run without a live server"""
+
+    def test_api_structure(self):
+        """Test that we can import the API module"""
+        from api.service import app
+
+        assert app.title == "Cheese API Server"
+        assert app.version == "v1"

@@ -82,3 +82,7 @@ docker-serve:
 # Stop the server of just docker-serve, and remove its container
 docker-stop:
     docker stop cheesecracker-run
+
+# Run the system tests against the server at http://localhost:9000. They fail when no server answers there
+test-system *args:
+    uv run pytest tests/system "$@"