code: def test_graph_matrix(self):
      max_atom_count = 5
      atom_array = [7, 7, 7, 8, 8, 8, 9, 6]
  
      A = np.zeros(
          shape=(max_atom_count, max_atom_count), dtype=np.float32
      )
      X = np.array(atom_array, dtype=np.int32)
  
      graph_matrix = GraphMatrix(adjacency_matrix=A, node_features=X)
      assert isinstance(graph_matrix.adjacency_matrix, np.ndarray)
      assert isinstance(graph_matrix.node_features, np.ndarray)
      assert graph_matrix.adjacency_matrix.dtype == np.float32
      assert graph_matrix.node_features.dtype == np.int32
      assert graph_matrix.adjacency_matrix.shape == A.shape
      assert graph_matrix.node_features.shape == X.shape
  
imports: import unittest
  import numpy
  from deepchem.feat.molecule_featurizers import GraphMatrix
label_desc: Use image node_id 1 for calling the TestGraphMatrix obj's underlying member method code with example usage: obj.test_graph_matrix() without return types