class_docstr: Unit tests for the LazyDotPytree class.
class_docstr_tok: ["Unit","tests","for","the","LazyDotPytree","class","."]
docstr: Test the __matmul__ method.
docstr_tok: ["Test","the","__matmul__","method","."]
code: def test_matmul(self):
      """Test the __matmul__ method."""
      coeffs = [1, 2, 3]
      ops = [qml.PauliX(0), qml.PauliY(0), qml.PauliZ(0)]
      mats = [qml.matrix(o) for o in ops]
      D = LazyDotPytree(coeffs=coeffs, mats=mats)
  
      another_matrix = qml.matrix(qml.PauliX(0))
      res = D @ another_matrix
  
      assert qml.math.allclose(
          res, qml.matrix(qml.dot(coeffs, ops)) @ another_matrix
      )
  
file_path: pennylane/tests/pulse/test_parametrized_hamiltonian_pytree.py
imports: import numpy
  import pytest
  import pennylane
label_desc: Use image node_id 2 for calling the TestLazyDotPytree obj's underlying member method code with example usage: obj.test_matmul() without return types