Software testing life cycle

Software testing life cycle identifies what test activities to carry out and when (what is the best time) to accomplish those test activities. Even though testing differs between organizations, there is a testing life cycle.

The software testing life cycle (STLC) identifies all testing activities and their relationship with other activities in the software development life cycle (SDLC).

What Does Testing Involve?
• Testing = Verification + Validation
• Verification: building the product right
• Validation: building the right product
• A broad and continuous activity throughout the software life cycle
• An information gathering activity to enable the evaluation of our work
e.g.:
-Does it meet the user’s requirements?
-What are the limitations?
-What are the risks of releasing it?

Software Testing Life Cycle consists of six (generic) phases:
• Test Planning
• Test Analysis
• Test Design
• Construction and verification
• Testing Cycles
• Final Testing and Implementation
• Post Implementation

Software testing has its own life cycle that intersects with every stage of the SDLC. The basic requirements in software testing life cycle is to control/deal with software testing – Manual, Automated and Performance.

Test Planning
This is the phase where Project Manager has to decide what things need to be tested, do I have the appropriate budget etc.
Naturally proper planning at this stage would greatly reduce the risk of low quality software. This planning will be an ongoing process with no end point. Activities at this stage would include preparation of high level test plan-(according to IEEE test plan template The Software Test Plan (STP) is designed to prescribe the scope, approach, resources, and schedule of all testing activities. The plan must identify the items to be tested, the features to be tested, the types of testing to be performed, the personnel responsible for testing, the resources and schedule required to complete testing, and the risks associated with the plan.). Almost all of the activities done during this stage are included in this software test plan and revolve around a test plan.

In Test Planning following are the major tasks:
1. Defining scope of testing
2. Identification of approaches
3. Defining risk
4. Identifying resources
5. Defining Time Schedule



Test Analysis
Once test plan is made and decided upon, next step is to deal a little more into the project and decide what types of testing should be carried out at different stages of SDLC, do we need or plan to automate, if yes then when the appropriate time to automate is, what type of specific documentation I need for testing.
Proper and regular meetings should be held between testing teams, project managers, and development teams, Business Analysts to check the progress of things which will give a fair idea of the movement of the project and ensure the completeness of the test plan created in the planning phase, which will further help in enhancing the right testing strategy created earlier. We will start creating test case formats and test cases itself. In this stage we need to develop Functional validation matrix based on Business Requirements to ensure that all system requirements are covered by one or more test cases, identify which test cases to automate, begin review of documentation, i.e. Functional Design, Business Requirements, Product Specifications, Product Externals etc. We also have to define areas for Stress and Performance Testing.

Test Design
Test plans and cases which were developed in the analysis phase are revised. Functional validation matrix is also revised and finalized. In this stage risk assessment criteria is developed. If you have thought of automation then you have to select which test cases to automate and begin writing scripts for them. Test data is prepared. Standards for unit testing and pass / fail criteria are defined here. Schedule for testing is revised (if necessary) & finalized and test environment is prepared.

Construction and verification
In this phase we have to complete all the test plans, test cases, complete the scripting of the automated test cases, Stress and Performance testing plans needs to be completed. We have to support the development team in their unit testing phase. And obviously bug reporting would be done as when the bugs are found. Integration tests are performed and errors (if any) are reported.

Testing Cycles
In this phase we have to complete testing cycles until test cases are executed without errors or a predefined condition is reached. Run test cases --> Report Bugs --> revise test cases (if needed) --> add new test cases (if needed) --> bug fixing --> retesting (test cycle 2, test cycle 3….).

Final Testing and Implementation
In this we have to execute remaining stress and performance test cases, documentation for testing is completed / updated, provide and complete different matrices for testing. Acceptance, load and recovery testing will also be conducted and the application needs to be verified under production conditions.

Post Implementation
In this phase, the testing process is evaluated and lessons learnt from that testing process are documented. Line of attack to prevent similar problems in future projects is identified. Create plans to improve the processes. The recording of new errors and enhancements is an ongoing process. Cleaning up of test environment is done and test machines are restored to base lines in this stage.


Software Testing Life Cycle Models
http://testingsolution.blogspot.com/2006/12/software-testing-life-cycle-models.html
http://www.extremesoftwaretesting.com/Directory/SoftwareTestingLifeCycle.html

Important software testing links:
http://www.softwaretestinghelp.com/