In our low code platform (https://github.com/dashjoin/platform), you end up writing several JSONata (https://jsonata.org/) snippets for ETL, actions, and visualizations.
These can be tested using junit. All changes to the app can be managed and deployed via GitHub. You can check out our sample app:
GitHub: https://github.com/dashjoin/dashjoin-demo Live: https://demo.my.dashjoin.com/