Types of tests to be included in a System Test (source Wikipedia)

1. Graphical user interface testing
2. Usability testing
3. Software performance testing
4. Compatibility testing
5. Exception handling
6. Load testing
7. Volume testing
8. Stress testing
9. Security testing
10. Scalability testing
11. Sanity testing
12. Smoke testing
13. Exploratory testing
14. Ad hoc testing
15. Regression testing
16. Installation testing
17. Maintenance testing
18. Recovery testing and failover testing.
19. Accessibility testing, including compliance with certain compliance needed for the disabled.