A surefire way to be shit tested is to think out loud. Obviously shit tests will come your way, but if you really want them to be coming at you like a Contra spray gun, say stuff out loud in front of your wife like:
Wonder if I have time to go to that place.
Thinking about going into town to pick something up..
Not sure which restaurant is better.
Maybe I shouldn't tell my brother about that.
I think I have time to fit that in before I leave.
When I do this in front of my wife, my wife immediately jumps in with a pointed opinion on the matter. I've been nuking these too frequently ("I didn't ask for your opinion" or "I don't need you to respond") and am coming across as a bitchy little boy in doing so.
I could avoid the whole damn situation by stopping my thinking out loud.
TL: DR Contemplate questions in your mind, and only open your mouth when you can firmly and decisively state as captain what you're going to do. Or better yet, don't say anything - just fucking do it!