There is one of the principles of test process planning that consists in testing a software program piecemeal, as in the case with bottom-up testing, where the product also is not tested as a whole. In this approach, only the course is changed – here the testing is performed from a main module to a sub module: the highest level modules are tested first, and then the tester gradually works down to the bottom. This is a top-down approach to software testing. Top-down and bottom-up are also known as incremental strategies.
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In top-down testing there is no need to write a shellcode, but the stubs are still required. As testing is conducted, the stubs are replaced one at a time with real modules.
The experts strongly disagree on which of the two incremental testing strategies is more effective. Some are sure that top-down approach is much better and therefore needs to be preferred over the other approaches and the others think that bottom-up testing is much more beneficial, although both approaches have their advantages and disadvantages. And still others believe these methods are approximately equivalent to each other.
In real life, the choice of test strategy is usually determined by the simple situation: each module is tested shortly after its creation, and, as a result, some components of the program may be tested using bottom-up approach, and the others may be subjected to top-down testing.
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Planning. Without a well-defined test approach and test plan, a testing process usually comes down to this: the programmer uses, one can say, the first available source data and runs the program several times correcting its defects as they are detected and ensuring that the actual results correspond to the expected results.
It is clear that in this case, only some of the blocks and operators are controlled, and the rest of them are executed for the first time and already during the counting and nobody can know whether or not defects will be found in the programs because it is chance circumstance.
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