jkniv-whinstone-tck
· Test Compatibility Kit (TCK) is a suite of tests that at least nominally checks a particular alleged implementation of a Repository pattern.
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 jkniv-whinstone-tck-0.6.8.jar file.
Once you open a JAR file, all the java classes in the JAR file will be displayed.