Expanded JIT Testing

### Details
Expand jit testing, making sure our functions can work with a wider range of inputs. We will also want to incorporate better error handling. 

### Issue Type
- [X] Feature
- [ ] Bugfix
- [ ] Documentation
- [ ] Refactoring
- [ ] Other:

### Requirements
- An overreaching Error type, implementing Rust's built in Err trait
- Expanded JIT testing, including error handling

### Notes