Testing Companies: Functional Criteria
Functional criterion is the most important testing criterion for the software industry. It primarily ensures that customer requirements for the product are fully met. Since the requirements relate to the product as a whole they describe the interaction of the program being tested with the environment. Functional testing is a black-box test design technique what means that it focuses on input and output of the software without peering into its workings or internal structure. Along with this verification method, testing companies also perform white-box testing known as glass / clear / transparent box testing.
Well, below are particular types of functional criteria:
- Testing of the rules – a set of tests should provide a review of each rule, if the input and output values are described by a set of certain grammar rules.
It should be noted that the grammar should be simple enough that the complexity of developing an appropriate set of tests will be real (in respect to schedule and the staff)
- Testing of the output classes – a set of tests must provide verification of a representative of each output class, given that the output is pre-classified, and separate result classes also include constraints that will affect resources or time out.
When creating tests the output classes are compared with the uses of the component under test, or subsystem, and this significantly reduces the selection options considered in the development of test sets. Quality assurance consultants will be at your disposal on demand so that to help you enhance cost-efficiency of your qa efforts.
- Testing of functions – set of tests should provide a review of each action implemented by the module under test, at least once.
It is a very popular criterion in real life, which, however, does not provide coverage for this functionality of the component being tested that is associated with structural and behavioral properties described without focus on specific functions (i.e., the description is dedicated to the whole component).
Criterion for functionality testing partly combines the characteristics of the structural and functional criteria. It is based on a “semi-transparent box” test design technique, which clearly shows not only the inputs and outputs of the component under test, but also the composition and structure of the methods (functions, procedures) and classes used.
- Combined criteria for the programs and specifications – a set of tests should ensure verification of all combinations of consistent conditions for the programs and specifications at least once.
In this case all the combinations of consistent conditions should be confirmed, and the contradiction conditions should be detected and eliminated.
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