Testing

• The purpose of testing is to ensure that for any input, the program always works correctly.
• Types of testing:

  • Iterative
  • Final/terminal
• Iterative testing

  The program is tested while it is being developed.
• Final/terminal testing

  The program is tested at the end of the development process. The whole program is tested at the same time to check that it's working correctly
• Syntax error

  Errors which break the grammatical rules of the programming language and stop it from being run/translated
• Logic error

  Errors which produces an unexpected output
• Tests should include:

  • Normal data
  • Boundary data
  • Invalid data
  • Erroneous data
• Normal test data

  Data which should be accepted by a program without causing errors
• Boundary test data

  Data of the correct type which is on the very edge of being valid
• Invalid test data

  Data of the correct data type which should be rejected by a computer system
• Erroneous test data

  Data of the incorrect data type which should be rejected by a computer system
• PRINt("hello)

  What type of error is this an example of?

  Syntax