Add FastAPI service, Dockerfile and compose

webapp/tests/test_app.py

@@ -0,0 +1,27 @@
+from fastapi.testclient import TestClient
+
+from app.main import app
+
+client = TestClient(app)
+
+
+def test_index():
+    r = client.get("/")
+    assert r.status_code == 200
+
+
+def test_health():
+    r = client.get("/health")
+    assert r.status_code == 200
+    assert r.json() == {"status": "ok"}
+
+
+def test_error_endpoint_returns_500():
+    assert client.get("/error").status_code == 500
+
+
+def test_metrics_exposed():
+    client.get("/health")
+    r = client.get("/metrics")
+    assert r.status_code == 200
+    assert "http_requests_total" in r.text