Fix test suite to reflect changed API.
Fix test suite to reflect changed API.

michael/substance-1,jacwright/substance,podviaznikov/substance,stencila/substance,abhaga/substance,TypesetIO/substance,substance/substance,andene/substance,substance/substance,jacwright/substance,michael/substance-1,andene/substance,abhaga/substance,podviaznikov/substance,TypesetIO/substance