Integration testing is a type of software testing that aims to verify the functionality of a system by testing the interaction between different components. It is often performed after unit testing and is used to verify that the different components of a system work together as expected. Integration testing can be performed at various levels from simple component-level testing to more complex end-to-end testing.

Integration testing is a type of software testing that aims to verify the functionality of integrated components of a system. It is often performed after unit testing and before validation testing. Integration testing can be either bottom-up where individual modules are integrated and tested until the complete system is built or top-down where the high-level modules are integrated first and low-level modules are integrated later.

Integration testing is a level of software testing where individual units are combined and tested as a group. The purpose of this type of testing is to expose the faults in the interaction between the integrated units. Integration tests are usually performed after unit and functional tests have been completed. In a bottom-up integration approach, lower-level units are combined first into progressively larger groups until all units have been integrated into a system. In contrast, a top-down approach starts with combining all units into subsystems and then proceeds to lower levels of integration.