The athletes knew that tournament officials would be 'testing for' (the presence of) illegal drugs.
Her class served as a 'testing ground' [='proving ground'] for new teaching methods.
You're 'testing' my patience. [=you are starting to make me annoyed or upset]
(..) -But we have to try. KATE: Okay. All right, start with something small that we're familiar with. We should capture a Hydrobot, bring it in for testing. JOHN: Yeah. What is it, John? Kill Kyle Reese, reset the future... ...no John Connor. (..)2009 Terminator Salvation