rename test function to better match others
rename test function to better match others

(The fact that it failed on VC14 is still documented in the comments.)
See issue #256
dstoe/vigra,funkey/vigra,dagophil/vigra,dagophil/vigra,dstoe/vigra,dagophil/vigra,dagophil/vigra,dagophil/vigra,dstoe/vigra,funkey/vigra,dagophil/vigra,dstoe/vigra,dstoe/vigra,funkey/vigra,funkey/vigra,dstoe/vigra,dagophil/vigra,funkey/vigra,funkey/vigra,funkey/vigra,dstoe/vigra