Workaround: Testing Logic Apps Data Mapper Maps on macOS

The Logic Apps Data Mapper in VS Code lets you create XML transformation maps on macOS. You can drag connections between source and target schemas, add functions, save — the visual designer works. The .lml file gets written to disk. You can even compile it to XSLT 3.0. But you can't test it. When you click Test Map on macOS, you get this: 400 – BadRequest: The .NET framework worker could not be found. The Test Map feature depends on the Azure Functions .NET Framework worker — a Windows-only component. The button is there, the backend isn't. You can create maps all day — you just can't verify they produce correct output without deploying to Azure or switching to a Windows machine. This post shows how to compile and run Data Mapper maps locally on any platform using the Logic Apps testing SDK and standard .NET unit tests. The options When you can't use Test Map, you have three paths: Deploy to Azure and test there — works, but slow and requires infrastructure for every iteration Start fu