def METHOD_NAME(self):
    mol = pybel.readstring("smi", "CCCC").OBMol
    adaptor = BabelMolAdaptor(mol)
    adaptor.make3d()
    conformers = adaptor.confab_conformers()
    assert adaptor.openbabel_mol.NumRotors() == 1
    assert len(conformers) >= 1
    if len(conformers) > 1:
        assert MoleculeMatcher().get_rmsd(conformers[0], conformers[1]) != approx(0)