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Functional software testing is intended to eliminate inconsistencies between the planned and actual behavior in terms of fulfilling the target business processes and generic functions of the product. Based on the project documentation and customer requirements, QA analysts develop an approach and testing methodology, prepare work plan, and forms the test scenarios, after which the team of experts starts the functional testing.

Imitation of practical use of the system by its consumer allows you to unmistakably set the degree of functional suitability of the program to its market release, its accuracy and compliance with the specified requirements and define its ability to interact with the other applications, security and stability of solution.

Generally, the functional testing must affect different levels of the system, for which there are such kinds functional testing, as unit testing (the verification of separate components), system testing (system performance in general) and integration functional site testing (the verification of interaction between all units). The comprehensive approach to the quality control is necessary for all kinds of software: both in the integration functional site testing and in working with the mobile desktop applications.

The objects of similar kinds of functional testing:
Business logic, i.e. the testing of data schema, simultaneous work of users and interaction between units and functions.
Units and functions, navigation between the units (in accordance with the standards or functional software requirements).

Functional units working with the integrated (including the external) subsystems,
Payment services (making payments, payment of the order),
Integrated components and API (social networks, informers, metrics),
Checking the web applications and sites for “broken” links, pictures and other files.

Testing the source code HTML and CSS for detecting errors in structure and syntax, critical for the functional content and graphically display (layout).

Basic level of safety (introduction of script and SQL-code, tampering with the address bar and identification of the source code).
Prototype (the basis of usability, structural prototype, navigation, logic of unit interactions).

The full functional testing services provide information on all defects of application and evaluates their criticality for the product. According to the test results, they made recommendations on the elimination of defects for the competent development of the project according to the business logic. The tester always send a quality report after every iteration of testing, whose goal is to provide general analytical information on the quality, evaluation of the current status of target functionality and the possibility of release. The report is prepared so that the information is available and understandable to any participant of the process- from the developers to the final customers, which guarantees the synchronization of the project team.

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