There are four main principles of software test services. On one side, it may seem that this is the unnecessary theory, but practice shows and confirm that theory should be implemented in practice.
#1. Testing Shows the Presence of Defects
A perfect and bug-less program is that, which haven’t yet written. Testing process helps reduce the likelihood of missing defects that are still in software. Even if testing didn’t detect defects, it doesn’t mean that the product is bug-less.
The most important thing when testing a software product is to be honest. Honesty is the best policy. The dedicated tester should always provide all the information about the risks on the project and in the product. The customer should always be aware of all the risks to evaluate them.
#2. Exhaustive Testing is Impossible
Easy programs can be tested by means of trivial testing that “guarantee” 100% coverage of all the input data and executable functional. For the complex systems, it’s essential to define priorities and analyze the risks. As a rule, the execution of any project is limited by means of money, time and resources. Therefore, within a time-bound framework when there is competent staff. one must determine what functionality of the program can possess more defects and put all the efforts in key areas.
#3. Early Testing
It’s recommended to begin testing process as soon as possible, regardless of the chosen model of software development. Testers have a bunch of tasks to do before checking the program, like studying the program requirements, preparing the documentation, defining the testing objectives, test design and developing test environment.
#4. Defect Clustering
There is an approach that nearly 80% of found defects are the result of 20% of code execution. It means that for complex systems and programs, often most errors are found in the lower part of the functionality but these mistakes often lead to serious failures of the program. Efforts to test the program must allocate depending on density of defects found in different parts of the functionality of the program.
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