Improve test output on failures and avoid C compiler warnings about signed/unsigned comparison.
Improve test output on failures and avoid C compiler warnings about signed/unsigned comparison.

da-woods/cython,da-woods/cython,cython/cython,cython/cython,da-woods/cython,scoder/cython,scoder/cython,cython/cython,scoder/cython,cython/cython,scoder/cython,da-woods/cython