old_contents: import numpy as np
  
  from numpy.testing import assert_array_equal
  from nose.tools import raises, assert_true
  
  from landlab.grid.structured_quad.nodes import status_with_perimeter_as_boundary
  from landlab.grid.structured_quad.links import active_link_ids
  
  from landlab.grid.base import CORE_NODE, FIXED_VALUE_BOUNDARY, CLOSED_BOUNDARY
  
  
  def test_active_links_ids():
      status = np.empty((4, 5), dtype=int)
      status.fill(CLOSED_BOUNDARY)
      status[1, 2] = status[1, 3] = status[2, 2] = status[2, 3] = CORE_NODE
  
      link_ids = active_link_ids((4, 5), status)
      assert_array_equal(link_ids, [7, 8, 21, 25])
      assert_true(str(link_ids.dtype).startswith('int'))
  
  
  def test_active_links_with_edge_boundaries():
      status = status_with_perimeter_as_boundary((3, 4))
      link_ids = active_link_ids((3, 4), status)
      assert_array_equal(link_ids, [1, 2, 5, 6, 11, 12, 13])
      assert_true(str(link_ids.dtype).startswith('int'))
  
  
  @raises(ValueError)
  def test_active_link_ids_with_shape_mismatch():
      active_link_ids((3, 4), np.zeros(3))
  
new_contents: import numpy as np
  
  from numpy.testing import assert_array_equal
  from nose.tools import raises, assert_equal
  
  from landlab.grid.structured_quad.nodes import status_with_perimeter_as_boundary
  from landlab.grid.structured_quad.links import active_link_ids
  
  from landlab.grid.base import CORE_NODE, FIXED_VALUE_BOUNDARY, CLOSED_BOUNDARY
  
  
  def test_active_links_ids():
      status = np.empty((4, 5), dtype=int)
      status.fill(CLOSED_BOUNDARY)
      status[1, 2] = status[1, 3] = status[2, 2] = status[2, 3] = CORE_NODE
  
      link_ids = active_link_ids((4, 5), status)
      assert_array_equal(link_ids, [7, 8, 21, 25])
      assert_equal(link_ids.dtype, np.int)
  
  
  def test_active_links_with_edge_boundaries():
      status = status_with_perimeter_as_boundary((3, 4))
      link_ids = active_link_ids((3, 4), status)
      assert_array_equal(link_ids, [1, 2, 5, 6, 11, 12, 13])
      assert_equal(link_ids.dtype, np.int)
  
  
  @raises(ValueError)
  def test_active_link_ids_with_shape_mismatch():
      active_link_ids((3, 4), np.zeros(3))
  
subject: Test of index arrays of type int.