Integration tests

An integration test is done by combining and testing different units or components that must have been tested in isolation. This test is to ensure that the different units of an application can work together to satisfy the user requirements. Through integration tests, you can uncover bugs in the system when different components interact and exchange data.

This test can be carried out by programmers, software testers, or quality assurance analysts. There are different approaches that can be used for integration testing:

• Top down: Top-level components are integrated and tested first before the lower level components
• Bottom up: Lower-level components are integrated and tested before top level components
• Big bang: All components are integrated together and tested at once