获取java maven项目中的当前工作资源目录

I am currently working on a JUnit test that checks functionality responsible for loading/saving a process configuration from/to some file. Given that a particular configuration file is present in resources, the functionality loads parameters from the file. Otherwise the functionality attempts to create new configuration file and persist a default configuration coded in the class. Right now I am using .class.getResource() method to check if configuration file exists, and to retrieve the necessary information. This approach is proven to be working fine from both maven's "test-class" and "class" directories. However, I am having problems while attempting to save default configuration when the file does not exist, namely the .class.getResource() method returns null, as the resource does not yet exist. This stops me from building the target resource directory (context-dependent) where the file should be saved. I am currently working on a JUnit test that che