Checking finder, I see the file size has not changed.
I created the user "test" when Apple tech support had me do so while trying to resolve a problem with a brand new iPad refusing to back up to my computer. We resolved that problem last week so I wanted to delete "test".
I am not sure I understand your question about deleting the user but saving the home folder. I had 2 users on this computer, myself and one other person plus guest. I am the administrator. The test user was only created recently. I opened preferences earlier, highlighted test and clicked the minus sign.
So do you think I should force quit preferences?