code: def test_projection_mat_expected_fail(D):
      with pytest.raises(AssertionError):
          p = projection_mat(S=S, D=D)
  
imports: from typing import Optional
  import numpy
  import pytest
  from gluonts.mx.model.deepvar_hierarchical._estimator import projection_mat
label_desc: Use image node_id 4 for calling a global function with example usage: test_projection_mat_expected_fail(D) without return types