field–test 
/ˈfi:ldˌtɛst/ verb
field–tests; field–test·ed; field–test·ing /ˈfi:ldˌtɛst/ verb [+ obj] : to test (something, such as a product) by using it in the actual conditions it was designed for
▪ These products need to be thoroughly field-tested before we can begin using them.
▪ These products need to be thoroughly field-tested before we can begin using them.
— field test noun, plural ∼ tests [count]
▪ doing a field test of the prototype
▪ doing a field test of the prototype
