Testing, black ,white and gray box testing
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- 2. University of Azad Jammu & Kashmir Neelum Campus Athmuqam Presented by: Aamir Mushtaq Shakir Roll No: 09 M. Ejaz Khan Roll No: 10 Session fall 2014-fall 2018 Semester 7th Presentation Topic: Difference between Black box, White box and Gray box testing 2
- 3. We will discuss: Test Software testing Black box testing White box testing Gray box testing Examples Advantages and disadvantages of each box Comparison of these boxes. 3
- 4. What does Test mean The word “TEST” is derived from the Latin word “Testum” used to measure or assess Software Testing Testing of software means assessing or Measuring the software to determine its QUALITY 4
- 5. The technique of testing without having any knowledge of the interior workings of the application is Black Box testing Black box testing is a method of software testing that examines the functionality of an application Determines whether combinations of inputs and operations produce expected results Black Box Testing 5
- 6. Cont…Cont… When performing a black box test, a tester will interact with the system's user interface by providing inputs and examining outputs without knowing how and where the inputs are worked upon 6
- 7. ExampleExample A tester, without knowledge of the internal structures of a website, tests the web pages by using a browser; providing inputs (clicks, keystrokes) and verifying the outputs against the expected outcome. 7
- 8. Black Box Testing Advantages Efficient Testing: Well suited and efficient for large code segments or units. Independency: Tester and programmer are independent of each other Non intrusive: code access not required. No Coding Skill Required: Tester need not know programming languages or how the software has been implemented. 8
- 9. Black Box Testing Disadvantages Localized Testing: Limited code path coverage since only a limited number of test inputs are actually tested. Blind Coverage: cannot control targeting code segments or paths which may be more error prone than others Redundant: Tests can be redundant if the software designer/ developer has already run a test case. 9
- 10. White box testing • White box testing is a method of testing software that tests internal structures or working of an application • In white-box testing an internal perspective of the system , as well as programming skills, are used to design test cases • It is also known as clear box testing, glass box testing, transparent box testing, and structural testing 10
- 11. Cont… • White box testing is the detailed investigation of internal logic and structure of the code • In order to perform white box testing of an application , the tester needs to possess knowledge of the internal working of the code 11
- 12. Example A tester, usually a developer as well, studies the implementation code of a certain field on a webpage, determines all legal (valid and invalid) and illegal inputs and verifies the outputs against the expected outcomes, which is also determined by studying the implementation code. 12
- 13. Advantages of White box testing Early Defect Identification: Analyzing source code and developing tests based on the implementation details enables testers to find programming errors quickly. No Waiting: Testing can be commenced at an earlier stage. One need not wait for the GUI to be available. Optimizing: It helps in optimizing the code • Extra lines of code can be removed which can be bring in hidden defects 13
- 14. White Box Testing Disadvantages Difficult to Scale: requires intimate knowledge of target system, testing tools and coding languages, and modeling. It suffers for scalability of skilled and expert testers. Difficult to Maintain: It requires specialized tools such as source code analyzers, debuggers, and fault injectors. Skipping: Sometimes it is impossible to look into every corner to find out hidden errors that may create problems as many paths will go untested Mechanic Work: White Box Testing is like the work of a mechanic who examines the engine to see why the car is not moving. 14
- 15. Gray Box Testing Gray box testing is a combination of white box testing and black box testing The aim of this testing is to search for the defects if any due to improper structure or improper usage of Applications Gray-box testing is also known as translucent testing 15
- 16. Example Testing a calculator for the features like testing for all operations at the same time if any problem arises then we make a change in HTML code and check further so at the same we go for white boxtesting(changing codes in backend) and black box testing(testing features on front end). Gray Box Testing 16
- 17. Gray-Box testing Advantages Offers Combined Benefits: Offers combined benefits of black box and white box testing wherever possible. Non Intrusive: Grey box testers don't rely on the source code; instead they rely on interface definition and functional Specifications The test is done from the point of view of the user and not the designer 17
- 18. Gray-Box testing Disadvantages Partial Code Coverage: Since the access to source code is not available, the ability to go over the code and test coverage is limited. Redundancy: The tests can be redundant if the software designer has already run a test case. 18
- 19. Bridge between Black Box and White Box – Gray Box Testing Technique Comparison between the Three Testing Types 19
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