Modify test to plot a parameter with and without units
Modify test to plot a parameter with and without units

ahaberlie/MetPy,Unidata/MetPy,jrleeman/MetPy,dopplershift/MetPy,dopplershift/MetPy,jrleeman/MetPy,ahaberlie/MetPy,Unidata/MetPy,ShawnMurd/MetPy