code: def test_control():
      """Test the _controlled method for the Snapshot operation."""
      assert isinstance(Snapshot()._controlled(0), Snapshot)
      assert (
          Snapshot("my_label")._controlled(0).tag
          == Snapshot("my_label").tag
      )
  
imports: import pytest
  import numpy
  from pennylane import Snapshot
  import pennylane
label_desc: Use image node_id 3 for calling a global function with example usage: test_control() without return types