HOW MANY TYPES OF TESTING APPROACHES?

Each of the followings represents a different testing approach: 
1.Black box testing 
2. White box testing 
3. Unit testing 
4. Incremental testing 
5. Integration testing 
6. Functional testing 
7. System testing 
8. End-to-end testing 
9. Sanity testing 
10. Regression testing 
11. Acceptance testing 
12. Load testing 
13. Performance testing 
14. Usability testing 
15. Install/uninstall testing 
16. Recovery testing 
17. Security testing 
18. Compatibility testing 
19. Exploratory testing
20. Ad-hoc testing 
21. User acceptance testing 
22. Comparison testing 
23. Alpha testing 
24. Beta testing 
25. Mutation testing. 
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