cvarTest works like ownerdrawflag.
It is used to display items only when a certain condition is met.

example: an item that shows only for unranked games (instagib or practice)
visible 1
rect 300 200 100 100
text "This is an unranked match"
cvarTest "sv_ranked"
showCvar {"0"} // 1=ranked match, 0 = unranked

As you can see, you also need showCvar. It indicates what value of the variable makes the item show. In the example the item only shows if "ranked" is false.

For a list of cvars go to