Definition

Component testing of individual components in isolation from surrounding components, with surrounding components being simulated by stubs and drivers.

[Source: BCS]

Comment

When performed problems can be identified early in the development lifecycle before the components are linked together. Where there are faults, the problem area is known at once. The tests can ensure that the component performs as specified, that all code written is tested and that the component is fit to be included in a larger system.

Also see: Component testing