code: def test_closing():
      myfield = basic_field()
      myfield.field[555] = 30
      myfield.field[664] = 0
      myfield.closing(2)
      field = myfield.get_field()
      assert field[737] == 17
      assert field[0] == 6
      assert field[999] == 27
      assert field[555] == 30
  
imports: import numpy
  import numpy.random
  from numpy.testing import assert_array_equal
  from ..field import field_from_coo_matrix_and_data, field_from_graph_and_data
  from ..graph import wgraph_from_3d_grid
label_desc: Use image node_id 17 for calling a global function with example usage: test_closing() without return types