Add a command line tool to generate OAS in a file

tests/test_oas/test_cmd/sample.py

@@ -0,0 +1,27 @@
+from aiohttp import web
+
+from aiohttp_pydantic import PydanticView
+
+
+class View1(PydanticView):
+    async def get(self, a: int, /):
+        return web.json_response()
+
+
+class View2(PydanticView):
+    async def post(self, b: int, /):
+        return web.json_response()
+
+
+sub_app = web.Application()
+sub_app.router.add_view("/route-2/{b}", View2)
+
+app = web.Application()
+app.router.add_view("/route-1/{a}", View1)
+app.add_subapp("/sub-app", sub_app)
+
+
+def make_app():
+    app = web.Application()
+    app.router.add_view("/route-3/{a}", View1)
+    return app