old_contents: import pathlib
  
  import numpy
  import pytest
  
  import helpers
  import meshio
  
  
  @pytest.mark.parametrize(
      "mesh",
      [
          helpers.tri_mesh,
          helpers.quad_mesh,
          helpers.tri_quad_mesh,
          helpers.add_point_data(helpers.tri_mesh, 1, dtype=int),
          helpers.add_point_data(helpers.tri_mesh, 1, dtype=float),
          helpers.line_mesh,
          helpers.quad8_mesh,
          # helpers.add_cell_data(helpers.tri_mesh, [("a", (), numpy.float64)]),
          # helpers.add_cell_data(helpers.tri_mesh, [("a", (2,), numpy.float64)]),
          # helpers.add_cell_data(helpers.tri_mesh, [("a", (3,), numpy.float64)]),
      ],
  )
  @pytest.mark.parametrize("binary", [False, True])
  def test_ply(mesh, binary):
      def writer(*args, **kwargs):
          return meshio.ply.write(*args, binary=binary, **kwargs)
  
      for k, c in enumerate(mesh.cells):
          mesh.cells[k] = meshio.CellBlock(c.type, c.data.astype(numpy.int32))
  
      helpers.write_read(writer, meshio.ply.read, mesh, 1.0e-12)
  
  
  @pytest.mark.parametrize(
      "filename, ref_sum, ref_num_cells",
      [("bun_zipper_res4.ply", 3.414583969116211e01, 948)],
  )
  def test_reference_file(filename, ref_sum, ref_num_cells):
      this_dir = pathlib.Path(__file__).resolve().parent
      filename = this_dir / "meshes" / "ply" / filename
  
      mesh = meshio.read(filename)
      tol = 1.0e-2
      s = numpy.sum(mesh.points)
      assert abs(s - ref_sum) < tol * abs(ref_sum)
      assert len(mesh.get_cells_type("triangle")) == ref_num_cells
  
  
  @pytest.mark.parametrize("binary", [False, True])
  def test_no_cells(binary):
      import io
  
      vertices = numpy.random.random((30, 3))
      mesh = meshio.Mesh(vertices, [])
      file = io.BytesIO()
      mesh.write(file, "ply", binary=binary)
      mesh2 = meshio.read(io.BytesIO(file.getvalue()), "ply")
      assert numpy.array_equal(mesh.points, mesh2.points)
      assert len(mesh2.cells) == 0
  
new_contents: import pathlib
  
  import numpy
  import pytest
  
  import helpers
  import meshio
  
  
  @pytest.mark.parametrize(
      "mesh",
      [
          helpers.tri_mesh,
          helpers.quad_mesh,
          helpers.tri_quad_mesh,
          helpers.add_point_data(helpers.tri_mesh, 1, dtype=int),
          helpers.add_point_data(helpers.tri_mesh, 1, dtype=float),
          helpers.line_mesh,
          # helpers.add_cell_data(helpers.tri_mesh, [("a", (), numpy.float64)]),
          # helpers.add_cell_data(helpers.tri_mesh, [("a", (2,), numpy.float64)]),
          # helpers.add_cell_data(helpers.tri_mesh, [("a", (3,), numpy.float64)]),
      ],
  )
  @pytest.mark.parametrize("binary", [False, True])
  def test_ply(mesh, binary):
      def writer(*args, **kwargs):
          return meshio.ply.write(*args, binary=binary, **kwargs)
  
      for k, c in enumerate(mesh.cells):
          mesh.cells[k] = meshio.CellBlock(c.type, c.data.astype(numpy.int32))
  
      helpers.write_read(writer, meshio.ply.read, mesh, 1.0e-12)
  
  
  @pytest.mark.parametrize(
      "filename, ref_sum, ref_num_cells",
      [("bun_zipper_res4.ply", 3.414583969116211e01, 948)],
  )
  def test_reference_file(filename, ref_sum, ref_num_cells):
      this_dir = pathlib.Path(__file__).resolve().parent
      filename = this_dir / "meshes" / "ply" / filename
  
      mesh = meshio.read(filename)
      tol = 1.0e-2
      s = numpy.sum(mesh.points)
      assert abs(s - ref_sum) < tol * abs(ref_sum)
      assert len(mesh.get_cells_type("triangle")) == ref_num_cells
  
  
  @pytest.mark.parametrize("binary", [False, True])
  def test_no_cells(binary):
      import io
  
      vertices = numpy.random.random((30, 3))
      mesh = meshio.Mesh(vertices, [])
      file = io.BytesIO()
      mesh.write(file, "ply", binary=binary)
      mesh2 = meshio.read(io.BytesIO(file.getvalue()), "ply")
      assert numpy.array_equal(mesh.points, mesh2.points)
      assert len(mesh2.cells) == 0
  
subject: Remove unsupported mesh type from PLY tests