class_docstr: Test that the class is intialized correctly.
class_docstr_tok: ["Test","that","the","class","is","intialized","correctly","."]
docstr: Test that the flatten and unflatten methods work correctly.
docstr_tok: ["Test","that","the","flatten","and","unflatten","methods","work","correctly","."]
code: def test_flatten_and_unflatten(self, coeffs, ops):
      """Test that the flatten and unflatten methods work correctly."""
      time, n, seed = (0.5, 2, 1234)
      hamiltonian = qml.dot(coeffs, ops)
      op = qml.QDrift(hamiltonian, time, n=n, seed=seed)
      decomp = op.decomposition()
  
      data, metadata = op._flatten()  # pylint: disable=protected-access
      assert data[0] == time
      assert metadata[0] == op.wires
      assert dict(metadata[1]) == {
          "n": n,
          "seed": seed,
          "base": hamiltonian,
          "decomposition": tuple(decomp),
      }
  
      new_op = type(op)._unflatten(
          data, metadata
      )  # pylint: disable=protected-access
      assert qml.equal(op, new_op)
      assert new_op is not op
  
imports: import copy
  from functools import reduce
  import pytest
  import pennylane
  from pennylane import numpy
  from pennylane.math import allclose, isclose
  from pennylane.templates.subroutines.qdrift import _sample_decomposition
label_desc: Use image node_id 6 for calling the TestInitialization obj's underlying member method code with example usage: obj.test_flatten_and_unflatten(coeffs, ops) without return types