Your directory must be structured as follows:

.
├── DD
│   └──Main.java
└── test
    ├── cases
    │   └── DD
    │       └── ...
    ├── __main__.py
    └── README.md

Where each directory is named after the problem code.

python3 test <problem_code>

Note: The stderr stream is printed out after each test case is run, so it is recommended to print debug statements to stderr.

Create your ".in" file in the cases directory and execute

python3 test --gen <problem_code>

This will generate a ".out" file with the expected output (from your program's execution).

Warning: This will overwrite any existing ".out" file.