docstr: Test the decomposition for StatePrep.
docstr_tok: ["Test","the","decomposition","for","StatePrep","."]
code: def test_StatePrep_decomposition(self):
      """Test the decomposition for StatePrep."""
  
      U = np.array([1, 0, 0, 0])
      wires = (0, 1)
  
      ops1 = qml.StatePrep.compute_decomposition(U, wires)
      ops2 = qml.StatePrep(U, wires=wires).decomposition()
  
      assert len(ops1) == len(ops2) == 1
      assert isinstance(ops1[0], qml.MottonenStatePreparation)
      assert isinstance(ops2[0], qml.MottonenStatePreparation)
  
imports: import pytest
  import pennylane
  from pennylane import numpy
  from pennylane.wires import WireError
label_desc: Use image node_id 2 for calling the TestDecomposition obj's underlying member method code with example usage: obj.test_StatePrep_decomposition() without return types