code: def test_adjoint():
      """Test the adjoint method for the Snapshot operation."""
      assert isinstance(Snapshot().adjoint(), Snapshot)
      assert (
          Snapshot("my_label").adjoint().tag == Snapshot("my_label").tag
      )
  
imports: import pytest
  import numpy
  from pennylane import Snapshot
  import pennylane
label_desc: Use image node_id 4 for calling a global function with example usage: test_adjoint() without return types