# RERUN/RESTART Testing

## Test Cases

| Test ID | Description |
|---------|-------------|
| RR-N001 | Create initial input data (5 records) |
| RR-N002 | Process input to output (idempotent operation) |
| RR-N003 | Re-run idempotent verification (same count/sum) |
| RR-N004 | Output file already exists (OPEN EXTEND, STATUS check) |

## Features Covered
- Idempotent re-execution (same data produces same result)
- OPEN EXTEND for existing output files
- FILE STATUS checking on file operations
- Sequential input/output processing

## Expected Results
All 4 tests should display PASS. Running the program twice should produce identical output.