9-software verification and validation (object oriented software engineering - bnu spring 2017)

Software Verification and Validation

FROM: HAFIZ AMMAR SIDDIQUI – COURSE: OBJECT ORIENTED SOFTWARE ENGINEERING – INSTITUTE: BEACONHOUSE NATIONAL UNIVERSITY

Software Verification and Validation■ Software Verification– Check whether the software meets the requirements and specifications– Asks the question “Are we building the system right?”– Uses methods like walkthrough and inspection– Usually done without executing the software

■ Software Validation– Check whether software meets the customer expectations and needs– Asks the question “Are we building the right system?”– Uses method like black box testing and white box testing– Done with executing the software


Software Testing


Software Testing■ Process of running a software with the intent of finding errors

■ Shows the presence of errors in a software

■ Check that a program does what it is intended to do

■ Execute the software with artificial data to check for defects

■ Identify situations in which the behavior of the software is incorrect or does notconform to its specification

■ Software testing mainly consists of following steps1. Design test cases2. Prepare test data3. Run program with test data4. Compare results to test cases


Equivalence Partitioning


Equivalence Partitioning■ Software testing technique that divides the input and/or output data of a software

unit into partitions of equivalent data which create the test cases

■ Equivalence partitions are created from the requirements specification for inputattributes that influence the processing of the test object

■ Create partitions of the input data set– Input data belonging to same partitionwill have the same effect on the software– Create a test case for each partition– Run the test case with any value in the partition– If the test case is successful for any single value from the partition then it issuccessful on all the data in the partition


Black Box Testing


Black Box Testing■ Software testing method in which the tester is not aware of the internal structure,

design, or implementation of the item being tested– Test cases are created using the requirement specifications of the software– Programming knowledge is not required– Implementation knowledge is not required– Carried out by testers or users– Performs functional and external testing– Examines the software inputs and outputs– Provides limited coverage of software– Does not help in optimizing the software– Can be carried out quickly


Structural or White Box Testing


Structural or White Box Testing■ Software testing method in which the tester is aware of the internal structure,

design, or implementation of the item being tested– Test cases are created using the detailed design of the software– Programming knowledge is required– Implementation knowledge is required– Carried out by developers– Performs structural and internal testing– Examines the software thoroughly– Provides maximum coverage of software– Helps in optimizing the software– Requires a lot of time


Reference■ Object Oriented Software Engineering: Using UML, Patterns, and Java by Bernd

Bruegge, Allen H. Dutoit, Prentice Hall, 2010

■ Software Engineering by Ian Sommerville, Addison-Wesley, 2011


9-software verification and validation (object oriented software engineering - bnu spring 2017)

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