Naval Term: To jettison or toss overboard, typically in the case of emergency. For example, a flaming aircraft on the deck of an aircraft carrier could cause catastrophic damage if is not immediately tested on its buoyancy.
As a general rule, any given object undergoing a Float Test is liable to fail. If actually testing a ship get a feel for its capabilities (such as top speed, dive depth, or flotation), that is called a Sea Trial.