Expose app runtime info across adapters

tests/test_info.py

@@ -0,0 +1,48 @@
+import unittest
+
+from fastapi.testclient import TestClient
+
+from ipython_demo import App, AppInfo
+from ipython_mcp.app import app as mcp_app
+from ipython_webapp.app import app as web_app
+from langchain_demo.ipython_wrapper import get_app_info
+
+
+class AppInfoTests(unittest.IsolatedAsyncioTestCase):
+    def test_app_info_describes_runtime_and_updates_after_execution(self):
+        app = App()
+
+        before = app.info()
+        self.assertIsInstance(before, AppInfo)
+        self.assertEqual(before.shell_count, 0)
+        self.assertIsNone(before.last_shell)
+        self.assertEqual(before.total_calls, 0)
+        self.assertGreaterEqual(before.uptime_seconds, 0)
+
+        app.run_code("1 + 1", shell_name="info-test")
+        after = app.info()
+
+        self.assertEqual(after.shell_count, 1)
+        self.assertEqual(after.last_shell, "info-test")
+        self.assertEqual(after.total_calls, 1)
+        self.assertGreaterEqual(after.uptime_seconds, before.uptime_seconds)
+
+    def test_web_app_exposes_info(self):
+        response = TestClient(web_app).get("/info")
+
+        self.assertEqual(response.status_code, 200)
+        self.assertIsInstance(response.json()["shell_count"], int)
+
+    async def test_mcp_app_exposes_info_tool(self):
+        tools = await mcp_app.list_tools()
+
+        self.assertIn("get_app_info", {tool.name for tool in tools})
+
+    def test_langchain_exposes_info_tool(self):
+        result = get_app_info.invoke({})
+
+        self.assertIsInstance(result, AppInfo)
+
+
+if __name__ == "__main__":
+    unittest.main()