code: def test_max_4():
      myfield = basic_field()
      myfield.field[555] = 28
      idx, depth = myfield.get_local_maxima(0, 27.5)
      assert np.size(idx) == 1
      assert idx[0] == 555
      assert depth[0] == 1
  
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 10 for calling a global function with example usage: test_max_4() without return types