Integration testing, often known as integration and testing (I&T), is a sort of software testing in which the various units, modules, or components of a software application are evaluated together. These modules, however, may have been created by separate programmers.
Typically, system integration testing is performed to validate the overall performance of the software system. The primary goal of this testing approach is to broaden the process and check the modules' integration with other groups.
The black box method is used for integration testing. This method entails a testing team interacting with an app and its units through the user interface — by clicking on buttons and links, scrolling, swiping, and so on. They are not required to understand how code works or to examine the components' backend.
System testing is a testing level in which tests are done to determine whether a full build meets functional and nonfunctional requirements. Integration testing, on the other hand, is a step of testing in which two or more software units are linked and tested concurrently.
There are two types of integration testing: incremental integration testing and full integration testing. Testing for non-incremental integration.