Validation rules look simple but they’re where business logic breaks.
What to Validate:
- Required fields are correctly enforced
- Error messages are clear and correct
- Rules trigger only when they should
- No conflict between multiple rules
How to Test:
- Try invalid inputs
- Try boundary values
- Try missing required fields
- Try unexpected combinations of fields
Common Bugs:
- Rule blocks valid data
- Rule does NOT block invalid data
- Conflicting validation rules
- Wrong or confusing error message
- Rule triggers in wrong scenario
Pro Tips:
- Always test multiple fields together. Many rules depend on combinations.
- Check error messages. They guide users, not just block them.