update unit tests to include error strings
update unit tests to include error strings

heuermh/gemini,bw2/gemini,heuermh/gemini,udp3f/gemini,brentp/gemini,bgruening/gemini,udp3f/gemini,brentp/gemini,bpow/gemini,bpow/gemini,bpow/gemini,bw2/gemini,udp3f/gemini,brentp/gemini,xuzetan/gemini,xuzetan/gemini,heuermh/gemini,arq5x/gemini,xuzetan/gemini,bw2/gemini,bgruening/gemini,bgruening/gemini,heuermh/gemini,arq5x/gemini,bw2/gemini,bpow/gemini,bgruening/gemini,xuzetan/gemini,brentp/gemini,arq5x/gemini,arq5x/gemini,udp3f/gemini