Unit 5 testing -software quality assurance

Unit 5 testing -software quality assurance

• 1.
  Software Quality assurance
• 2.
  Quality assurance tests •Debugging – process of finding out where something went wrong and correcting the code to eliminate the errors and bugs that cause unexpected results
• 3.
  Types of errors •Language error (syntax) • Run time error • logic error
• 4.
  Quality assurance testing •Types – Error based testing – Scenario based testing
• 5.
  Quality assurance testing •Types • Error based testing – Search a given class’s method for particular clues of interest, then describe how these clues should be tested – Ex: employee.computepayroll(hour) • Scenario based testing – Usage based testing – Concentrates on what users does, not on what product does
• 6.
  Testing strategies • Blackbox testing – Internal working is not available for inspection – Input and output tested • White box testing – Test the specific logic to guarantee the system’s proper functioning – Path testing • one form of white box testing • Make sure the path of the method executed at least once during testing • Two types – statement testing coverage – Branch testing coverage
• 7.
  Testing strategies • Topdown testing – assumes that main logic or objects interactions and systems messages of the application need more testing than individual objects methods or supporting logic – Can detect serious design flaws early in the implementation • Bottom up testing – To test individual objects – Starts with the details of the system and proceeds to higher levels by a progressive aggregation
• 8.
  Impact of objectorientation on testing • Impact of inheritance in testing • Base class – Inherited() – redefined() • Derived class – Inherited() – redefined() • Reusability of tests – In this inheritance example • Ssets of test requirement ‘ll overlap.
• 9.
  Test plan • Testplan is developed to detect and identify potential problems before delivering the software to its users
• 10.
  Steps to createtest plan • Objectives of the test – What • Development of a test case • how • Test analysis – Examining test output, and documemntation the test result
• 11.
  Who should dothe testing • Designers • Quality assurance group • Beta testing – popular – Expensive – Group of actual users of the system • Alpha testing