Once the parameters had been trained as detailed in Section 2.1, we tested the resulting force field, Parsley-1.0.0, against optimized geometries outside the training set, and compared the results to those obtained with the initial force field, SMIRNOFF99Frosst-v1.1.0. We also tested Parsley against two data types outside the training set: energy differences among conformers of a given molecule, and physical properties of various organic liquids. Tests against vibrational spectra and torsional energy potentials are reserved for future studies. Benchmark comparisons of Parsley in the context of other general force fields are also available. We now describe how these tests were done.