In the “src” folder, there are two subfolders: “main” and “test”. Inside “main”, there are two more folders: “java”, where we keep our code, and “resources”, where we store files like “application.properties”. Within the “java” folder, there’s a folder called “com.projectname” which holds all our modules, controllers, and services. Inside this folder, there’s an “Application” file, which is the main file that runs the program. Similarly, we have a test file for this class located at “src/test/java/com.projectname/applicationTests”.

The convention for writing test files is to create a folder with the same name as the one in the main code, and add “Tests” at the end of the file name. For example, if we have a “ProductController” in the “Controllers” folder in the main code, we create a “ProductControllersTest” file in the “test/java/com” folder. We simply follow the same folder structure and add “Tests” to the end of the class name.