Fix formgrade tests
Fix formgrade tests

EdwardJKim/nbgrader,jupyter/nbgrader,jhamrick/nbgrader,jdfreder/nbgrader,alope107/nbgrader,jupyter/nbgrader,modulexcite/nbgrader,MatKallada/nbgrader,EdwardJKim/nbgrader,MatKallada/nbgrader,jdfreder/nbgrader,EdwardJKim/nbgrader,EdwardJKim/nbgrader,alope107/nbgrader,ellisonbg/nbgrader,jhamrick/nbgrader,jupyter/nbgrader,modulexcite/nbgrader,ellisonbg/nbgrader,jupyter/nbgrader,ellisonbg/nbgrader,dementrock/nbgrader,ellisonbg/nbgrader,jhamrick/nbgrader,dementrock/nbgrader,jupyter/nbgrader,jhamrick/nbgrader