Testing

/ˌɪn.tɪˈɡreɪ.ʃən ˈtɛs.tɪŋ/

noun — "finding out which pieces break when they finally have to talk to each other."

Integration Testing is a software testing practice that verifies how individual units or components work together as a group. While unit tests focus on isolated code, integration testing examines the interactions between modules, services, or systems to ensure data flows and dependencies behave correctly.

/ˈjuː.nɪt ˈtɛs.tɪŋ/

noun — "proving each tiny piece works before it embarrasses the whole system."

Unit Testing is a software testing practice where individual components, or units, of code are tested in isolation to verify that they behave as expected. A unit is typically the smallest testable part of an application, such as a function, method, or class.