add some more f-string tests
add some more f-string tests

fabianrost84/cython,scoder/cython,da-woods/cython,c-blake/cython,cython/cython,c-blake/cython,scoder/cython,da-woods/cython,ChristopherHogan/cython,scoder/cython,cython/cython,fabianrost84/cython,ChristopherHogan/cython,scoder/cython,cython/cython,da-woods/cython,c-blake/cython,c-blake/cython,da-woods/cython,fabianrost84/cython,fabianrost84/cython,cython/cython,c-blake/cython,fabianrost84/cython,ChristopherHogan/cython