Types of integration testing in software engineering

Independent testing is performed by testing specialists who have not been involved in the system’s development. They ensure that the delivered software meets both functional and non-functional requirements. Various independent testing services include regression testing, API testing, performance testing, configuration testing, localization testing, usability testing, security testing, data migration testing etc. Such independent services have their own set of benefits for the client. They carry minimized risk of low-quality software, have an increased transparency of the acquired system, reduced product support costs, have greater cost-efficiency and accelerated timelines in the implementation stage, and improved brand image due to enhanced product quality thus ensuring optimized testing costs due to the outsourcing model.

Software testing services is a separate industry. This industry provides software testing services such as performance testing, stability testing, usability testing and security testing. It does not sell its own software, but uses internally developed software to complete its testing tasks. While the industry enjoys a low level of regulation and relatively low startup costs, it has significant barriers to entry. The largest barrier is finding qualified workers that have a broad knowledge of software development and computer code. While some tests have become automated, the vast majority of procedures are done manually, which makes this industry very labor intensive. Demand for software testing services ultimately derives from total demand for software, as testing is an integral part of the development process.

Integrated testing starts after completion of unit testing. Integration testing finds bugs that occur when two or more models are integrated. Its main purpose is to identify the functional, requirement and performance level bugs. Integrated testing in software engineering is the testing process to verify that when two or more modules interact, they produce result that satisfies its original functional requirement or not. When modules are not integrated, they perform as per requirement but when they are integrated, functional, requirement and performance related issues occur due to the integration. There are three different types of integration testing approach in software testing. Big Bang Integration testing approach is used to find the bugs when all the developed modules have interacted with each other and creates a complete software system and produces result satisfying with original requirement. In Top Down integrated testing approach, all top level integrated modules are tested first and its sub modules are tested from top to down step by step. In Bottom Up integrated testing approach, all bottom level integrated sub modules are tested first and its main modules are tested from bottom to up step by step.

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