Unit 2.3 Robust Programs

Key Words and Phrases on Robustness
1. Authentication - A coding method that checks that the user really is who they say they are. It can also be physical, for example through the use of a banking secure key
2. Maintainability - Code must be maintainable. We can use comments and indentation to provide information to future users and programmers that may be required to maintain the code.
3. Comments - Help explain the code and its function Using the hash symbol.
4. Indentation - Used to help group together a function
5. Anticipating Misuse - We predict how someone could abuse the program and the plan for these issues
6. Data Sanitisation - Cleaning up inputted data so it is ready for apps or the program to use.
7. Data Validation - Makes sure that data entered is reasonable. Comes in many forms.
  1. Check Digit - The last one or two digits in a code are used to check the other digits are correct
  2. Format Check - Checks inputs are in the right format
  3. Length Check - Checks it isn't too long/short
  4. Lookup Table - Looks up acceptable values in a table
  5. Presence Check - Checks if data has been entered into a field
  6. Range Check - Checks that the value falls in the specified range
  7. Spell Check - Looks up spellings in the dictionary
8. Data Verification - Makes sure that data entered is accurate through either dual entry or double checking.
Different types of Test Data
1. Normal - Data in the range
2. Extreme - Data lying on the edge of the range (Min/Max)
3. Erroneous - Data outside of the range
4. Null Value - Nothing is entered
5. Invalid - Wrong type of data inputted
Key Terms on Testing
1. Iterative Testing - Testing as you go along. Done line by line or section by section
2. Final Testing - Carried out at the ending, when it's fully written
3. Syntax Errors - Mistakes in the way the code is written
4. Logic Errors - A bug in the program that makes it run incorrectly
5. Bugs - These cause programs to run incorrectly and are often caused by erroneous code
6. SYSTEMS LIFECYCLE - THIS CYCLE LOOPS
  1. Background Investigation
    1. Analysis
      1. Design - Test Plan is created here
        Implementation - Iterative Testing takes place
        Testing - Final Testing occurs
        Evaluation - We feedback on our testing here

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Unit 2.3 Robust Programs

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