old_contents: import pytest
  
  import mbuild as mb
  from mbuild.tests.base_test import BaseTest
  
  
  class TestTiledCompound(BaseTest):
  
      def test_2d_replication(self, betacristobalite):
          nx = 2
          ny = 3
          nz = 1
          tiled = mb.TiledCompound(betacristobalite, [nx, ny, nz])
          assert tiled.n_particles == 1900 * nx * ny
          assert tiled.n_bonds == 2400 * nx * ny
  
      def test_no_replication(self, betacristobalite):
          nx = 1
          ny = 1
          nz = 1
          tiled = mb.TiledCompound(betacristobalite, [nx, ny, nz])
          assert tiled.n_particles == 1900 * nx * ny
          assert tiled.n_bonds == 2400 * nx * ny
  
      def test_incorrect_periodicity(self, betacristobalite):
          nx = 2
          ny = 3
          nz = 2
          with pytest.raises(ValueError):
              mb.TiledCompound(betacristobalite, [nx, ny, nz])
  
      def test_negative_periodicity(self, betacristobalite):
          nx = -2
          ny = 3
          nz = 2
          with pytest.raises(ValueError):
              mb.TiledCompound(betacristobalite, [nx, ny, nz])
  
  
  
new_contents: import pytest
  
  import mbuild as mb
  from mbuild.tests.base_test import BaseTest
  
  
  class TestTiledCompound(BaseTest):
  
      def test_2d_replication(self, betacristobalite):
          nx = 2
          ny = 3
          nz = 1
          tiled = mb.TiledCompound(betacristobalite, [nx, ny, nz])
          assert tiled.n_particles == 1900 * nx * ny
          assert tiled.n_bonds == 2400 * nx * ny
  
          for at in tiled.particles():
              if at.name.startswith('Si'):
                  assert len(tiled.bond_graph.neighbors(at)) <= 4
              elif at.name.startswith('O'):
                  assert len(tiled.bond_graph.neighbors(at)) <= 2
  
      def test_no_replication(self, betacristobalite):
          nx = 1
          ny = 1
          nz = 1
          tiled = mb.TiledCompound(betacristobalite, [nx, ny, nz])
          assert tiled.n_particles == 1900 * nx * ny
          assert tiled.n_bonds == 2400 * nx * ny
  
      def test_incorrect_periodicity(self, betacristobalite):
          nx = 2
          ny = 3
          nz = 2
          with pytest.raises(ValueError):
              mb.TiledCompound(betacristobalite, [nx, ny, nz])
  
      def test_negative_periodicity(self, betacristobalite):
          nx = -2
          ny = 3
          nz = 2
          with pytest.raises(ValueError):
              mb.TiledCompound(betacristobalite, [nx, ny, nz])
  
  
  
subject: Expand tiled compound testing