In this post I will be discussing an important SDLC in testing that is used in the industry.
The V Model
The picture above describes the V model. The left arm of the V represents the waterfall model and the right arm represents testing for each phase of the waterfall model. This model is not named only by the shape it forms but becuase we do only Validation here so it is called as the V model. In the model if both Verification is also done then then the model is called as the V-V model
I assume that the readers know the waterfall model and I will be discussing each testing phase
Unit Testing : This testing is done by the developers. In this testing the developers test each component of a module seprately to verify if the component is working as it is expected
Integration Testing : In this testing the testers verify if different components of the same module are synchronized with each other and are working as per requirement or not.
System Testing : In this testing the testers verify if the subsystems of the software systems are working together or not
In the industry the Integration Testing and the System Testing are combined together and they performed as System Integration Testing (SIT) , since they are almost similar in function
User Acceptance Testing: This is the final phase of testing where the software is shown to the client to check if the software meets the requirement or not.
The issues and the comments given by the clients are taken up as Observations or Triage Results and based on the complexity of the observation a Change Request (CR) is raised and the changes are made .
The major advantage of this SDLC is that Testing exists at all phases of the life cycle, and this life cycle is not only applicable to a waterfall model but can be used with other models as well such as the Iterative, Agile and Rapid Application Development Model.
Each phase of testing has an Entry and Exit Criteria
The Entry phase for Unit Testing is
I assume that the readers know the waterfall model and I will be discussing each testing phase
Unit Testing : This testing is done by the developers. In this testing the developers test each component of a module seprately to verify if the component is working as it is expected
Integration Testing : In this testing the testers verify if different components of the same module are synchronized with each other and are working as per requirement or not.
System Testing : In this testing the testers verify if the subsystems of the software systems are working together or not
In the industry the Integration Testing and the System Testing are combined together and they performed as System Integration Testing (SIT) , since they are almost similar in function
User Acceptance Testing: This is the final phase of testing where the software is shown to the client to check if the software meets the requirement or not.
The issues and the comments given by the clients are taken up as Observations or Triage Results and based on the complexity of the observation a Change Request (CR) is raised and the changes are made .
The major advantage of this SDLC is that Testing exists at all phases of the life cycle, and this life cycle is not only applicable to a waterfall model but can be used with other models as well such as the Iterative, Agile and Rapid Application Development Model.
Each phase of testing has an Entry and Exit Criteria
The Entry phase for Unit Testing is
- When development is completed
- When there is no NC(Non Compliance) for the coding standards
- When all bugs have been fixed
- When Unit Testing is completed and all bugs have been fixed
- Build has been deployed in the SIT Testing Environment
- Test Cases Written and all the test cases have covered the Requirements and approved from the development team
The Exit Phase for SIT are
- All bugs found in SIT phase have been fixed
- SIT Report should be published
The Entry Phase for UAT are
- SIT should have been completed
- Quality audit should have been completed with no NC
- Requirements must be met
- Final Sign off from the Client
Thus I hope I was able to give a small idea about the V model. More in my next post.
Till Then
Cheers From,
Sai :)
