Different testing approaches

Performance testing,
Install/uninstall testing,
Usability testing,
Recovery testing,
Security testing,
Compatibility testing,
Exploratory, ad-hoc testing,
User acceptance testing,
Comparison testing,
Alpha testing,
Beta testing, and
Mutation testing.
Black box testing,
White box testing,
Unit testing,
Incremental testing,
Integration testing,
Functional testing,
System testing,
End-to-end testing,
Sanity testing,
Regression testing,
Acceptance testing,
Load testing,