Quality Assurance Testing Services: Requirements for an Ideal Test Criterion
- The criterion should be sufficient, i.e., show when a finite set of tests is sufficient to test the program.
- The criterion must be complete, i.e., in case of an error there must be a test available among a plurality of tests to satisfy the criterion which discloses an error.
- The criterion should be reliable, that is, any two sets of tests that meet it, should simultaneously disclose or not to disclose the program’s errors.
- The criterion should be easily verifiable, such as computable through tests.
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In general, for nontrivial types of software, there is no complete and reliable criterion depending on the programs or specifications.
Therefore, we strive to get a perfect general criterion through real quotients.
- Structural criteria use information about the structure of the program (the criteria for so-called “white-box”)
- Functional criteria are formularized in the description of requirements to the software product (the criteria for so-called “black box”)
- Stochastic test selection criteria are formulated based on the results of the inspection of whether or not the specified properties have been implemented in the application under test, obtained by means of some statistical hypothesis testing.
- Mutation criteria are focused on testing software product properties based on the Monte Carlo approach.
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Structural criteria (class 1).
Structural criteria use the program that is referred to as a “white-box”, which implies knowledge of the source code of the program or program specifications in the form of control flow graph. Structural information is clear and accessible to developers of subsystems and software modules, therefore this class of criteria is often used at the stages of unit and integration testing (Unit testing, Integration testing).
Structural criteria are based on the basic elements of control flow graph, statements, branches and paths.
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