TST: Add tests for a few more methods
TST: Add tests for a few more methods

squirrelo/american-gut-web,biocore/american-gut-web,squirrelo/american-gut-web,squirrelo/american-gut-web,PersonalGenomesOrg/american-gut-web,PersonalGenomesOrg/american-gut-web,biocore/american-gut-web,PersonalGenomesOrg/american-gut-web,josenavas/american-gut-web,josenavas/american-gut-web,josenavas/american-gut-web,biocore/american-gut-web