System integration testing (SIT) is a process of testing high-level software with the aim of inspecting the role of other related systems in maintaining the data integrity. The testers also check for the coordination of other subcomponents making up a specified system in a specified area. SIT involves the building and integrating the system modules to ensure that they can work on their own. It also tests for the performance of systems when to put together into another system in a different environment. It is a form of black box testing that requires writing after all the system meets all the requirements.
After the integration of the data in the system, the data flows through three states that include data state within the integration layer, database layer, and application layer. The three layers provide a platform during the software testing. Failure of integrating of all the units leads to issues while running the software program.
The Process of System Integration Testing
System integration testing involves developing a program structure by combining hardware and software components. After the integration, software developers test the system as a whole to uncover any underlying errors. The next process involves correction of errors through isolation of incorrect programs, after which the continuous integration process continues. The software testing also works on a large host environment where the developers simulate other the target environment in the host. After the test, the developers run a confirmation test to identify the environmental related problems and correct them.
Importance of Integration Testing
• SIT allows for correct flow of data and control in the system
• Helps in detecting the problems early thus allowing for flexibility in fixing the defects.
• It helps in the proper timing and the use of the memory.
• System Integration Testing gives early feedback on the acceptability of the modules.
• It helps the software developers correct the software require after conducting the software testing.
Quality Assurance and SIT
Application of quality assurance in the system integration testing helps in the management of the system code base as well as assist in the transfer of the codebase from one environment to another. Quality assurance uses business requirements, architectural and technical designs, as well as the specifics on functions in completing the changes in the system. The developers perform the application quality assurance just comes before the system integration system. It checks for the behavior of the individual component when integrated into another system. Using a collaboration of quality assurance and system integration testing allows the software developers to identify defects earlier in the testing. This helps in the correction of the errors and carrying out retests early in advance.