add resonanceTest
add resonanceTest

tests to elucidate #91 of RMG-website

pierrelb/RMG-Py,pierrelb/RMG-Py,nickvandewiele/RMG-Py,nyee/RMG-Py,nickvandewiele/RMG-Py,chatelak/RMG-Py,chatelak/RMG-Py,nyee/RMG-Py