The Role Of Testing In Software Development Life Cycle

Software development life cycle (SDLC) is an integral part of any software application development. Testing has a lot of influence in SDLC.

Software Testing is necessary in SDLC, because we all make mistakes. Some of those mistakes are unimportant, but some of them are expensive or dangerous. Growth of each industry may depends on the quality of their products. We need to check everything and anything we produce. It may help to produce good quality of products.

Software testing is very important because of the following reasons:

  1. Software testing is really required to point out the defectsand errors that were made during the development phases.
  2. It’s essential since it makes sure of the Customer’s reliability and their satisfaction in the application.
  3. It is very important to ensure the Quality of the product. Quality product delivered to the customers helps in gaining their confidence.
  4. Testing is necessary in order to provide the facilities to the customers like the delivery of high quality product or software application which requires lower maintenance cost and hence results into more accurate, consistent and reliable results.
  5. Testing is required for an effective performance of software application or product.
  6. It’s important to ensure that the application should not result into any failures because it can be very expensive in the future or in the later stages of the development.
  7. It’s required to stay in the business.



Unit testing is often automated but it can also be done manually. This encourages developers to modify the source code without immediate concerns about how such changes might affect the functioning of other units or the program as a whole Unit testing can be time-consuming and tedious.


Integration testing allows individuals the opportunity to combine all of the units within a program and test them as a group. This testing level is designed to find interface defects between the modules/functions.


System testing is the testing of a complete and fully integrated software product. It is a series of different tests whose sole purpose is to exercise the full computer based system. System testing falls under the black box testing category of software testing. White box testing is the testing of the internal workings or code of a software application. In black box or system testing is the opposite. System testing involves the external workings of the software from the user’s perspective.


Acceptance Testing is the final level Acceptance testing (or User Acceptance Testing), is conducted to determine whether the system is ready for release. During this final phase, the user will test the system to find out whether the application meets their business’ needs. Once this process has been completed and the software has passed, the program will then be delivered to production.