Testing

							             Types of Testing
• Inspection
  – Formal group activities where participants
    manually examine code for occurrences of
    well-known errors, syntax, logic
     • Where is the read next record
     • Dates
     • Negative Logic
  – Function of the code is not tested
              Types of Testing
• Walkthroughs
  – Manual check of the function of code
  – “Random” group of programmers
     • Who selects the programmers
     • Should the BOSS be at the walk through
  – Checks consistency of code with coding standards
  – When
     • Before computer testing
     • After computer testing
             Types of Testing
• Automated
  –   Unit
  –   Integration
  –   System
  –   Volume
  –   Acceptance
              Unit Testing
• Each module is tested alone in an attempt to
  discover any errors in its code

• Test each line of code
          Integration Testing
• The process of bringing together all of the
  modules that a program comprises for
  testing purposes.
• Modules are typically integrated in a top-
  down incremental fashion
             System Testing
• Bringing together of all of the programs that
  a system comprises for testing purposes in a
  top down fashion
• Start with the control module
• Stub testing
  – Substitute generic code to test the lowest level
    modules
           Volume Testing
• Increase size of file
• Increase number of users
• Impact on storage/response issues
             Stress Testing
• Tries to break the hardware system.
• Impact on other systems
• Problems with concurrent users
           Recovery Testing
• Can a corrupt file be recreated?
  – Amount of lost data
• Backing up of data
  – Full versus Incremental
  – Timing
  – How long/how many of the backups should be
    saved?
         Acceptance Testing
• The process whereby actual users test a
  completed information system
Software Testing
 Methodology
   User Acceptance Testing

Volume/Stress/Recovery Testing

       System Testing

      Integration Testing

         Unit Testing
    Software Testing Issues

• Who should do the testing
  – programmers
  – professional tester
  – the end user
• Testing Strategies:
  – Top-Down
  – Bottom-Up

  – Black box
  – White box
  – Alpha
  – Beta
         Alpha/Beta Testing
• Alpha Testing
  – Using simulation data
• Beta testing
  – Using real data
  – Done by user in the user environment
                    Test Scripts
• Using simulation data
• Create a test case to ensure that each line of code
  will be tested
• Registration example
  –   Invalid Social Security Number
  –   Attempt to add a class with an invalid call number
  –   Attempt to add a closed class
  –   Invalid SSN (not a student)
  –   Register for two classes at the same time
  –   Register before you have the required cumulative hours
                 Test Scripts
•   Identify test case
•   Specify in detail desired outcomes of test case
•   Specify in detail actual outcomes of test case
•   Resolve discrepancies, if any
    – Who should do this?
    – To whom should the discrepancy be reported?
• Log the results
        Registration Example
                   Test Scripts
• What would happen IF
  – A valid SSN was keyed - but the student has no
    classes on the student class table
  – An invalid SSN was keyed
  – A valid SSN was keyed and
     • The student has 4 classes
     • The student has 7 classes
     • The student has 10 classes