old_contents: import mbuild as mb
  import parmed as pmd
  import pytest
  
  from foyer import Forcefield
  from foyer.tests.utils import get_fn
  
  
  @pytest.mark.timeout(1)
  def test_fullerene():
      fullerene = pmd.load_file(get_fn('fullerene.pdb'), structure=True)
      forcefield = Forcefield(get_fn('fullerene.xml'))
      forcefield.apply(fullerene, assert_dihedral_params=False)
  
  
  @pytest.mark.timeout(15)
  def test_surface():
      surface = mb.load(get_fn('silica.mol2'))
      forcefield = Forcefield(get_fn('opls-silica.xml'))
      forcefield.apply(surface)
  
  
  @pytest.mark.timeout(45)
  def test_polymer():
      peg100 = mb.load(get_fn('peg100.mol2'))
      forcefield = Forcefield(name='oplsaa')
      forcefield.apply(peg100)
  
new_contents: import mbuild as mb
  import parmed as pmd
  import pytest
  
  from foyer import Forcefield
  from foyer.tests.utils import get_fn
  
  
  @pytest.mark.timeout(1)
  def test_fullerene():
      fullerene = pmd.load_file(get_fn('fullerene.pdb'), structure=True)
      forcefield = Forcefield(get_fn('fullerene.xml'))
      forcefield.apply(fullerene, assert_dihedral_params=False)
  
  
  @pytest.mark.timeout(15)
  def test_surface():
      surface = mb.load(get_fn('silica.mol2'))
      forcefield = Forcefield(get_fn('opls-silica.xml'))
      forcefield.apply(surface, assert_bond_params=False)
  
  
  @pytest.mark.timeout(45)
  def test_polymer():
      peg100 = mb.load(get_fn('peg100.mol2'))
      forcefield = Forcefield(name='oplsaa')
      forcefield.apply(peg100)
  
subject: Allow for some missing silica bond parameters