JUnit & Mockito Testing for Java

I'm seeking an experienced Java developer with deep knowledge in JUnit and Mockito. The primary goal of this project is to write test cases for specific classes in my codebase to ensure code coverage.

I will provide the classes that need testing. Your task will be to:
- Write comprehensive JUnit test cases using Mockito
- Ensure coverage for the specified classes

Ideal candidates should have:
- Strong expertise in Java, JUnit and Mockito
- Experience in writing test cases for code coverage
- Ability to understand and work with existing codebase
- Keen attention to detail to ensure all edge cases are covered.