code: def test_asc_merge_2():
      """Test ascending merge
  
      Test that ROI being their own parent are inchanged.
      """
      hroi = make_hroi()
      s1 = hroi.get_size(0)
      hroi.merge_ascending([0])
      assert hroi.k == 9
      assert hroi.get_size(0) == s1
  
imports: import numpy
  from numpy.testing import assert_array_equal
  from ..discrete_domain import domain_from_binary_array
  from ..hroi import HROI_as_discrete_domain_blobs, make_hroi_from_subdomain
  from ..mroi import subdomain_from_array
label_desc: Use image node_id 7 for calling a global function with example usage: test_asc_merge_2() without return types