Functional testing focuses on the pre–specified behavior of a program or system and is based on an analysis of functional requirements of a feature or system as a whole.
Functional tests are run to verify functionality of the system and may be applicable at all levels of testing at a time. (unit, component, integration, system, acceptance). As a rule, this functionality is described in the requirements specification document, functional specifications and as use cases.
Functional testing services involve testing the software against:
- requirements
- business processes
It Is Time to Get Acquainted With Functional Testing Methods:
Equivalence partitioning. Equivalence classes for input data (e.g. valid and invalid values) are defined according to the specifications. Then the specialists develop tests that divide input test of the program data being tested into various equivalence data classes. In other words, this technique is used to set the values into classes for testing.
Boundary value testing. Analysis of the app’s behavior at the boundaries. Firstly, there must tests developed to check the “border” of equivalence classes. Tests are as follows: for class boundaries, for the minimum and maximum values. The same tests are created for the output data (that is the attempt to produce incorrect output).
Functional testing service is worth your money if you aim to make your applications user-friendly and stable.
Functional diagram-based testing. Disadvantages: incompleteness and inconsistency in the specifications. Functional diagram is a text written in a formal language, which is used to translate the specification to. The diagram includes the causes (input conditions) and effects (output conditions or system conversion). Then, a functional diagram is transformed into a Boolean graph that establishes ‘cause-effect’ relationship. Each node in the graph can be in condition zero (it exists) or 1 (it does not exist). Then the diagram is supplied with comments that specify restrictions on the combinations of causes and effects. Finally, the diagram is converted to a decision table: an effect is selected which is set to 1, and all the combinations of the causes are identified (considering the restrictions), which determine the selected effect in 1.
Are you not indifferent to quality of your application? Once you see it work incorrectly it is the indication of the problem, maybe too serious and irresolvable!! Do not wait until you software product shows wrong behavior – it is always less expensive to prevent problem with QA testing companies than solve it!
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