Regression testing

[Kenneth Porter]

--On Friday, March 18, 2005 10:05 PM +0100 Enrico Scholz 
<enrico.scholz at informatik.tu-chemnitz.de> wrote:

> Please use %check for such tests. This makes it easy, to bypass them
> with '--define check\ exit\ 0'; %build or %install would require manual
> editing of the .spec-file

What is %check? A standard macro? A standard build stage? Or something new? 
(I don't recall seeing it mentioned in Maximum RPM.)