field test

Short definition from Wiktionary

Noun

1. 1
   A test of something conducted in conditions under which it was designed to actually operate, especially out in the real world instead of in a laboratory or workshop.
2. 2
   A test of something conducted in conditions under which it was designed to actually operate, especially out in the real world instead of in a laboratory or workshop: A test of something that can be performed in the field rather than solely in a laboratory or workshop.

Verb

1. 1
   To test something using the conditions that it was designed to operate under, especially out in the real world instead of in a laboratory or workshop.