Improvements Which Have Been Made:

1. Readable Method Names: Changed helper method names to assertEncodeLong, assertDecodeInt, etc.
2. Improved Assertions: Added descriptive messages to assertions for better clarity on what went wrong.
3. Multiple Random Tests: Instead of a single random test, now running multiple random tests to better validate functionality.
4. Standard Charset Usage: Explicitly used StandardCharsets.UTF_8 for clarity.
5. Testing for Failures: Used assertThrows to validate failure scenarios, which is more concise and readable.