From 18297dd550ff63ac248fecb3a6e2e2befafe5d18 Mon Sep 17 00:00:00 2001
From: demo-bot <demo-bot@kyndryl.com>
Date: Sun, 9 Aug 2026 15:10:49 +0000
Subject: [PATCH] decomposer: generate files for Create a production-suitable
 Dockerfile and minimal Docker Compose configuration for packaging and running
 the completed FastAPI endpoint monitoring service.

---
 tests/test_containerizer.py | 61 +++++++++++++++++++++++++++++++++++++
 1 file changed, 61 insertions(+)
 create mode 100644 tests/test_containerizer.py

diff --git a/tests/test_containerizer.py b/tests/test_containerizer.py
new file mode 100644
index 0000000..6c0697d
--- /dev/null
+++ b/tests/test_containerizer.py
@@ -0,0 +1,61 @@
+import tempfile
+import unittest
+from pathlib import Path
+
+from containerizer import containerize
+
+
+class ContainerizerTests(unittest.TestCase):
+    def service(self, health=True):
+        temp = tempfile.TemporaryDirectory()
+        root = Path(temp.name)
+        (root / "app").mkdir()
+        route = '@app.get("/health")\n' if health else ""
+        (root / "app/main.py").write_text(
+            "from fastapi import FastAPI\napp = FastAPI()\n" + route)
+        (root / "requirements.lock").write_text("fastapi==0.115.6\nuvicorn==0.34.0\n")
+        return temp, root
+
+    def payload(self, health="/health"):
+        return {
+            "service_specification": {"container": {
+                "startup_module": "app.main:app", "port": 8000,
+                "health_endpoint": health}},
+            "target_management_implementation": {"preserved": 1},
+            "endpoint_check_implementation": {"preserved": 2},
+            "current_status_implementation": {"preserved": 3},
+        }
+
+    def test_writes_artifacts_and_preserves_contract(self):
+        temp, root = self.service()
+        self.addCleanup(temp.cleanup)
+        output = containerize(self.payload(), root)
+        self.assertEqual(output["target_management_implementation"], {"preserved": 1})
+        self.assertEqual(set(output["container_artifacts"]["files"]),
+                         {"Dockerfile", "compose.yaml", ".dockerignore"})
+        self.assertIn("USER 10001:10001", (root / "Dockerfile").read_text())
+        self.assertIn('uvicorn", "app.main:app', (root / "Dockerfile").read_text())
+        self.assertIn("healthcheck:", (root / "compose.yaml").read_text())
+
+    def test_omits_healthcheck_without_matching_configuration(self):
+        temp, root = self.service(health=False)
+        self.addCleanup(temp.cleanup)
+        containerize(self.payload(health=None), root)
+        self.assertNotIn("healthcheck:", (root / "compose.yaml").read_text())
+
+    def test_rejects_healthcheck_not_present_in_app(self):
+        temp, root = self.service(health=False)
+        self.addCleanup(temp.cleanup)
+        with self.assertRaisesRegex(ValueError, "not found"):
+            containerize(self.payload(), root)
+
+    def test_rejects_unpinned_dependencies(self):
+        temp, root = self.service()
+        self.addCleanup(temp.cleanup)
+        (root / "requirements.lock").write_text("fastapi>=0.100\n")
+        with self.assertRaisesRegex(ValueError, "exact"):
+            containerize(self.payload(), root)
+
+
+if __name__ == "__main__":
+    unittest.main()