remove trailing slash from checkpoints tests
remove trailing slash from checkpoints tests

nteract/nteract,nteract/composition,nteract/nteract,jdfreder/nteract,rgbkrk/nteract,captainsafia/nteract,jdfreder/nteract,nteract/nteract,captainsafia/nteract,rgbkrk/nteract,rgbkrk/nteract,captainsafia/nteract,captainsafia/nteract,jdfreder/nteract,nteract/composition,rgbkrk/nteract,nteract/composition,nteract/nteract,jdfreder/nteract,rgbkrk/nteract,nteract/nteract