Seven Principles of Software Testing: In this post, we are going to discuss the principles of software testing. Software testing is a process of delivering a quality product having no defect, and also that meets all the requirements of the client. So while testing the application, if testers follow testing principles, then testers can able to remove all the errors from the software.
Software Testers Principles of Testing
Here are the seven software testing principles:
- Testing shows the presence of defects
- Exhaustive testing is not possible
- Early testing
- Defect clustering
- Pesticide Paradox
- Testing is context-dependent
- The absence of errors fallacy
Testing shows the presence of defects: The main goal of software testing is to fail the software. If an application is tested in all possible scenarios, then we can able to reduce the number of defects. Sometimes after multiple rounds of regression testing, testers are not able to find a few defects, but that doesn’t mean that the software is bug-free. Because software testing can reduce the number of defects but not removes all the defects.
Exhaustive Testing is not Possible
Exhaustive testing is a process where we test software with all possible inputs like (valid or invalid) and precondition. It is impossible to perform exhaustive testing because always we can’t test software with all possible scenarios and test cases. So we test software with some number of test cases, and we assume that the software is working as per the requirements if we got the expected result for every tested test case. If we test software with all possible scenarios and with all test cases, then it will take more cost and effort also, which is impractical.
Software Testing Fundamental Principles
Early testing: As sooner we start the testing activities when we have the requirement and design document, then we can able to find out the defect in the starting stages of SDLC. This helps to reduce the expense.
Defect clustering: In software testing, defect clustering means small modules and functionality have most of the operational failures. As per the Pareto principle (80-20 rule), 80% of defects are found is small modules and 20% defects found in other modules. So try to focus on those small modules where more possibility of finding defects or operational failures.
Pesticide paradox: in software testing pesticide paradox means doing retest with the same test cases will not help you to find any new bugs, so it is necessary to review the existed test cases and add or update the test cases for finding new defects.
Testing is context-dependent: how will you test the developed software product is depends upon the context of that software product. Different software needs a different type of testing approach. For example, when you are going to test a web application will not the same when you are going to test a mobile application.
The absence of errors fallacy: Just because our developed software does not have any defects, that doesn’t mean that that software is ready to ship. the main goal of the software is following all the requirements of the customer. So it is not only necessary that software has 99% for bug-free, but also it fulfils all the requirements by the customer.
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