There are 3 steps which allow to see this code in action:

• build project
• run application
• run tests inside your IDE

Build project:

./gradlew clean build -x test

Run application:

./gradlew bootRun

Run tests:

Open IDE and run UserTest as general JUnit test

For more details visit official documentation:

• Karate framework for testing our endpoints
• Spring Initializr the easiest way to start with Spring Boot
• Spring Boot allows to build Spring based application very quickly
• Spring Data Jpa provides enhanced support for JPA layer
• Gradle Build Tool your next build tool ;)