Designing the test can be quite a labor-intensive process. In so doing, you will have to follow the 5 steps:
1) determine the purpose of the test;
2) write input values;
3) write the expected output values;
4) execute the test and document the result;
5) analyze the result.
The correct approach to each testing stage influences the quality of testing in general. The importance and necessity of the second stage is beyond doubt.
The third stage will help to avoid ambiguity in the fifth stage. In most cases, if there is no description of what should happen, try to “adjust” the logic of reasoning in the analysis of the results. In addition, very often this item requires the formation of either an independent evaluation (criterion) or an alternative calculation by the algorithm. In the first case it is very easy to control the overall result, in the second case, – to understand the operation of the algorithm in more detail. There are cases when manual calculation of the assumed output values leads to errors in the logic of the program. Penetration test service appears to be indispensable when security vulnerabilities become a concern.
The fourth stage is almost mechanical. At this stage, you do not need to think, but only strictly follow the prescription and accurately record the values.
If the execution of the test produces results that do not correspond to the intended ones, it means that either there is an error or the expected results are incorrect (an error in the test). To eliminate this kind of misunderstanding, you need to carefully check the set of tests (to “test” tests).
The use of automated tools makes it possible to reduce the laboriousness of the testing process. For instance, there are tools that substitute drivers. Flow analysis tools allow you to number routes in the program, define non-executable operators and track places where variables are used before assigning values to them. Also, there are programs that allow you to perform functions with a set of parameters that vary within the specified limits, which in general allows you to test the function or method by using the exhaustive search technique.
When preparing for unit testing, it is advisable to revise the psychological and economic principles of testing. During the test, attention should be paid to side effects, for example, if the method does what it should not do. In general, this situation is difficult to detect, but sometimes side effects can be identified if you check not only the expected output variables, but others, whose state should not change during the testing process. Therefore, during the test, it is necessary to check these variables along with the expected results.