This project demonstrates the possibility to test your Vaadin 14 Spring apps with Karibu Testing.
The example contains a view that submits T-shirt orders. The UI is similar to what you might have seen in Vaadin expo booth.
In addition this version submits the orders to a JPA backend, validates the data automatically based on JSR-303 annotations in the domain object and also contains a view to list current submissions.
You can use it as a basis for your Vaadin experiments. To play around with the example, check it out using git or download the zip. Import it to your favorite IDE and execute the Application class or start the app from command line using:
git clone https://github.com/mvysny/t-shirt-shop-example
cd t-shirt-shop-example
mvn spring-boot:run
The application opens to http://localhost:8080
Visit Karibu-Testing for full documentation on Vaadin Unit testing.
There is a tutorial about Creating CRUD UI with Vaadin at https://spring.io/guides/gs/crud-with-vaadin/ and for more complete Vaadin examples, visit http://vaadin.com/start