shop window test
n.— «The car has to pass what GM executives refer to as the “shop window test.” That is, an owner must be so enamored of the Astra’s lines that he can’t help but sneak a look at its reflection in a plate-glass window.» —“Coming Soon as the 2008 Saturn Astra” by Andy Enright Edmunds Inside Line June 12, 2007. (source: Double-Tongued Dictionary)