Java Priority Queue via Skip List -- 2

I need a Java implementation of a priority queue using a skip list for an academic assignment. The project will require the following:

- Code comments and explanations: The code needs to be clear and easy to understand, with comments explaining the purpose and functionality of each section.
- Unit tests: You will need to create unit tests to verify the functionality of the priority queue.
- Detailed documentation: The implementation should be thoroughly documented, explaining each part of the code and the overall design of the priority queue.

Moreover, a key requirement of this project is optimizing for insertion efficiency. The priority queue should be designed to handle insertions as efficiently as possible.

Ideal skills for this project include:
- Proficiency in Java
- Deep understanding of data structures and algorithms, particularly skip lists and priority queues.
- Experience with writing detailed code comments and documentation.
- Ability to create comprehensive unit tests.