Testing

Testing

Reliability is improved by doing thorough testing. Testing is done to find problems so they can be fixed which improves the computer system.

Testing can never be complete because:

• Software can be very complex
• It is expensive
• Takes a long time

There are too many things to test in a complex system.

For good testing, you must test:

• Normal data - Inputting expected, normal data.
• Erroneous data - Unexpected inputs that are out of the set range.
• Extreme data - Inputting data to test the boundaries of a program.

Example: A program which checks if an input is between 1 and 10.
Normal data - 5.
Erroneous data - 11 or ABC.
Extreme data - 1 or 10.