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Black box testing - SlideShare jayed hossain jibon

Black box testing is a software testing method that evaluates an application's functionality without knowledge of its internal workings, allowing testers to assess the software from an end-user perspective. Techniques used in black box testing include boundary value analysis, equivalence class partitioning, decision table testing, and state transition testing. While it has advantages such as efficiency and accessibility for non-technical testers, it also has limitations including an inability to identify the causes of failures and potential gaps in test coverage.

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Presented by : Md : Jayed Hossain Jibon B.sc in SWE jayed.swe@gmail.com Daffodil International University
What is Black Box Testing ? Black-box testing is a method of software testing that examines the functionality of an application without peering into its internal structures or workings. 30-07-2016 2
- What is Black Box Testing ? - Who does it - Techniques of Black Box Testing - Example of Black Box Testing Techniques - Advantage And disadvantage of black box testing Objective 30-07-2016 3
What is black box testing ? -Knows only what the software is supposed to do. -Doesn't know how it operates inside. Why named as Black Box Testing ? -No one can see the inside. What & Why 4 30-07-2016
Who does black box testing? -Testers. -Business analyst. -Clients. When we do? -Once the functionality is developed. Why not by the developers? -Very difficult to break one’s own code. -Fresh eyes are always help. -To test the software from end-user perspective. Who, When & Why 5 30-07-20106
- Boundary value analysis (BVA). - Equivalence class partitioning (ECP). - Decision table testing. - State transition testing. Techniques of Black Box Testing 6 30-07-2016
Boundary Value Analysis Dividing the test data into 6 parts - Min (Minimum value from test data) - Max (Maximum value from test data) - Min – 1 (Minimum minus 1) - Max – 1 (Maximum minus 1) - Min + 1 (Minimum plus 1) - Max +1 (Maximum plus 1) 30-07-2016 7
Suppose a password field accepts minimum 6 digit and maximum 10 digit and if we consider test data are " 0-5, 6-10, 11-14 ". Example 1 of Boundary Value :- Example Equivalence and Boundary Value Equivalence Class Partitioning Test Case ID Test Scenario Description Expected Outcome 1 Enter 0 to 5 numbers in password field System should accept 2 Enter 6 to 10 numbers in password field System should not accept 3 Enter 1 to 14 numbers in password field System should not accept 8 30-07-2016
Test Scenario # Data Expected Result Test Coverage 1 1-6 Accepted A1,A2,A3 2 0-9 Not Accept A2 3 6-10 NOT accept A1 4 11-14 NOT accept A1 Examples 2 Of Equivalence Class Partitioning : 9 30-07-20106 A1=Input have to be minimum 6 digit and maximum 10 digit A2=Input numbers should be > 1 A3=Input numbers should be <100
Conditions User Id F T F T Action Expected Result Error Error Error Login Examples 3 Of Decision table password F F T T 10 30-07-20106
11 30-07-2016 On Off State Transition Testing Diagram:
State Transition Testing State Table: Switch off Switch on On Off - Off - On Test case Id Input Expected Result Current State Event 1 On Off Off 2 On On On 3 Off On On 4 Off Off Off 12
Advantages of Black Box Testing - Efficient when used on large systems. - Tester can be non-technical. - Tests are done from a user's point of view Disadvantages of Black Box Testing - The reason for a failure is not found. - Not all properties of a software product can be tested - May leave many program paths untested Advantages and Disadvantages of Black Box Testing 13 30-07-20106
Question ? 14 30-07-20106
THANKS TO EVERYONE. 15 30-07-20106