There are a variety of approaches QA experts employ with web or mobile app integration testing, and database integration testing. Some of the most practiced include:
When all the individual units that make up a component, or module, are fully coded and
tested, they are combined together and checked once more as a group in a phase called
integration testing. A group of modules may form the entire software system itself but more
often, they make up major parts of the system.
QA integration testing looks at how components interface and interact when they are consolidated. Unlike a unit test that focuses strongly on the functionality of a single piece of code (does it do what we expect it to do?), software integration testing shines a light on the flow of information and data between modules.
Taking our previously mentioned hot air balloon analogy, the units that make up a hot air balloon can be tested on their own via unit QA, i.e. the basket, the metal cables that connect the basket to the envelope (balloon), the envelope, the propane tanks, and the board burner; however, it is with integration quality assurance that you make sure all the parts work together as expected. For example, do the cables affix correctly and securely to the basket? Do the propane tanks sufficiently supply the burner? Integration phase of quality assurance helps answer those critical questions.
Advantages of Integration Testing
Integration testing in software engineering plays a key role in revealing flaws in the code prior to a system-wide release. Because multiple software developers are often the authors of the various modules that comprise an entire piece of software, you cannot always ensure the same exact logic and architecture was executed across units during the initial engineering. In the important stage of software system integration testing, a group of quality assurance professionals will:
Methods of Integration Testing in Software Engineering
When all the software units are bundled together, evaluating them in one fell swoop is commonly referred to as a big bang approach.
This type of integration-level QA starts first with confirming the top-level components while using stubs to simulate lower-level components. Eventually, testers make their way down to examining the actual lower-level components.
Opposite of top-down, a bottom-up approach starts with verifying the low-level units while using drivers to simulate the top-level units. Then testers make their way up to the top-level units for evaluation.
Sandwich integration testing incorporates a hybrid mix of top-down and bottom-up approaches.
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