add test for Data astype array casting
add test for Data astype array casting

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