Tests for REST endpoints. REST to DB related tests run against im memory database. REST to executor related tests use mocked executor to avoid using remote services.
Download JD-GUI to open JAR file and explore Java source code file (.class .java)
Click menu "File → Open File..." or just drag-and-drop the JAR file in the JD-GUI window integration-test-2.5.1.jar file.
Once you open a JAR file, all the java classes in the JAR file will be displayed.