Producing robust programs

Producing robust programs

1. defensive design

   • ensures correct run
   • plans for contingencies
   • minimises bugs
   • ensures maintainability
   • controls unexpected inputs
   • validation
     • checks input sensibility
     • what is checks
       • data type
       • letter case
       • length

2. maintainability

   • use reusable variables
   • format well
     • use indents
   • add comments
   • improve readability

3. testing

   • test plans
     • test data
     • reason for test
     • expected outcome
     • actual result
   • data test types
     • valid
       • produces expected results
     • invalid
       • should produce errors
     • borderline
       • tests between types
   • types of testing
     • iteration testing
       • test regularly
       • test during development
       • reduces resource wastage
     • terminal testing
       • test after development
       • test final project