fix measurements unit test
fix measurements unit test

fahhem/openhtf,fahhem/openhtf,ShaperTools/openhtf,grybmadsci/openhtf,google/openhtf,grybmadsci/openhtf,ShaperTools/openhtf,jettisonjoe/openhtf,ShaperTools/openhtf,jettisonjoe/openhtf,jettisonjoe/openhtf,jettisonjoe/openhtf,grybmadsci/openhtf,google/openhtf,fahhem/openhtf,google/openhtf,ShaperTools/openhtf,google/openhtf,fahhem/openhtf,grybmadsci/openhtf,ShaperTools/openhtf