code: def test_left_d_threshold_sequence(self):
      assert nxt.left_d_threshold_sequence(3, 2) == ["d", "i", "d"]
      assert pytest.raises(
          ValueError, nxt.left_d_threshold_sequence, 2, 3
      )
  
imports: import pytest
  import networkx
  import networkx.algorithms.threshold
  from networkx.algorithms.isomorphism.isomorph import graph_could_be_isomorphic
label_desc: Use image node_id 12 for calling the TestGeneratorThreshold obj's underlying member method code with example usage: obj.test_left_d_threshold_sequence() without return types