Creating test classes ensures that the Apex class works according to specifications by validating the functionality under various scenarios and edge cases. Running tests in the Developer Console provides detailed feedback on whether the class meets requirements.
Reference:Testing Apex
Incorrect Options:
A:Savepoints and rollbacks are used to manage transactions, not for validation.
B:Try/catch blocks handle exceptions but do not ensure the code adheres to specifications.
C:Execute Anonymous only tests small portions of code interactively, not comprehensive functionality.