specify block units of 'splits' in existing Images tests
specify block units of 'splits' in existing Images tests

kcompher/thunder,oliverhuangchao/thunder,j-friedrich/thunder,zhwa/thunder,pearsonlab/thunder,kunallillaney/thunder,thunder-project/thunder,j-friedrich/thunder,jwittenbach/thunder,broxtronix/thunder,oliverhuangchao/thunder,kunallillaney/thunder,poolio/thunder,zhwa/thunder,pearsonlab/thunder,broxtronix/thunder,kcompher/thunder,mikarubi/thunder,poolio/thunder,mikarubi/thunder