- 14 new security-focused tests covering all safety improvements
- Test safe dtype, loss function, optimizer, metrics, and device mappings
- Test injection attack prevention and safe fallback behaviors
- Test regex-based safe function execution patterns
- Verify no eval/exec exists in codebase via automated scan
- Test comprehensive security coverage for all vulnerable functions
- All 48 tests pass (34 original + 14 security + 1 optimizer test)
- Maintains 80% code coverage with enhanced security validation
