Testing Spring Application Behavior When Porting to Codename One

The Codename One backend is not Spring compatible, though it uses similar syntax to simplify migration. Because familiar annotations cannot confirm that a ported app behaves identically, the article recommends writing tests in the original Spring application first. Those tests capture client-facing behavior and are then carried over to Codename One, using its testing API with comparable request builders and assertions. The example covers a /greet/{name} endpoint and an unknown route returning not found, and the same inputs and expectations are kept while only framework imports and annotations change. The author advises testing validation errors, missing records, denied access, and stored state for write endpoints, since these expectations define what the port must preserve.