These techniques are used to make sure all parts of the code are exercised.
Common White Box Techniques
- Statement Testing
Ensures every line of code runs at least once. - Branch Testing
Ensures every “if/else” decision is tested. - Path Testing
Ensures all possible paths through the code are tested. - Condition Testing
Tests how the program behaves when conditions evaluate to true or false. - Expression Testing
Tests how regular expressions behave with different inputs.
Error-Based Testing (Finding Known Weak Spots)
These techniques focus on areas where defects are most likely to occur.
Examples include:
- Fault Seeding
Intentionally adding known defects to confirm tests can detect them. - Mutation Testing
Making small changes to the code to see if tests catch the errors
(Effective but time-consuming and expensive.) - Using Historical Test Data
Prioritizing tests that failed often in the past.