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
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
• Black box 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
• Top down 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 object orientation 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
• Test plan is developed to detect and
identify potential problems before
delivering the software to its users
10. Steps to create test 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 do the testing
• Designers
• Quality assurance group
• Beta testing
– popular
– Expensive
– Group of actual users of the system
• Alpha testing
