The engine is mounted on a test-bed and attached to a computer-controlled dynamometer, which is used to apply an adjustable load.

ECONOMIST: Car design

The repair shop put an engine on a test bed, attached sensors, hooked it to computers, and tried every possible combination of gas and air.

FORBES: Institutional Stupidity, III

This puts different stresses on hardware and provides a unique test bed for products under development.

FORBES: Consortium Builds Next-Generation Net