Use execute_phase_once() in util/test.py (#567)
Use execute_phase_once() in util/test.py (#567)


jettisonjoe/openhtf,google/openhtf,ShaperTools/openhtf,jettisonjoe/openhtf,ShaperTools/openhtf,ShaperTools/openhtf,jettisonjoe/openhtf,google/openhtf,google/openhtf,google/openhtf,jettisonjoe/openhtf,ShaperTools/openhtf,ShaperTools/openhtf