Service Quality Assurance: Integration Testing
Integration testing involves examining the system consisting of two or more modules. The main objective of integration testing is to find defects resulting from errors in the implementation and interpretation of interaction between the interfaces of the modules.
Service quality assurance is meant to ensure quality, functionality and usability of software apps; improve efficiency of any organization and optimize business processes.
From a technological point of view, integration testing is a quantitative extension of unit testing, as like unit testing, it operates interfaces of the modules and subsystems and requires the creation of a test environment, including the stubs that replace the missing modules.
The main difference between unit and integration testing lies in their goal, namely in the types of defects detected, which in turn, determine the strategy for choosing input data and analysis methods. In particular, at the level of integration testing it is common to use methods involving interfaces coverage, such as calling functions or methods, or analyzing the use of interface objects, such as global resources, means of communication provided by the operating system.
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Fig. 1 Example of program set structure
Fig. 1 shows the set of programs K, consisting of modules Ml, M2, Mil, M12, M21 and M22 tested at the stage of unit testing. Problem to be solved by integration testing is testing of the inter-module connections performed during the execution of the program set K. Integration testing uses a white box approach at the module level. Since the tester is well familiar with the program’s text and even knows how to call all the modules included in the set being tested, the use of structural criteria it is possible and justified at this stage.
Automated testing service involves using specialized tools that execute pre-scripted tests on software before it is made available to the wider public. This helps to control execution of test cases and compare the actual result with the expected result. Automated testing allows to regress software apps thoroughly with each update or change.
Integration testing is used at the stage of assembling the tested modules into a unified complex.