[C++/BF/UT] Fix test precision
[C++/BF/UT] Fix test precision

Fix the precision of the test so that it passes on amd64 and i386

esc/Psignifit-3.x,esc/Psignifit-3.x,esc/Psignifit-3.x,esc/Psignifit-3.x,esc/Psignifit-3.x,esc/Psignifit-3.x