docstr: Test broadcasting for StatePrep.
docstr_tok: ["Test","broadcasting","for","StatePrep","."]
code: def test_StatePrep_broadcasting(self):
      """Test broadcasting for StatePrep."""
  
      U = np.eye(4)[:3]
      wires = (0, 1)
  
      op = qml.StatePrep(U, wires=wires)
      assert op.batch_size == 3
  
imports: import pytest
  import pennylane
  from pennylane import numpy
  from pennylane.wires import WireError
label_desc: Use image node_id 3 for calling the TestDecomposition obj's underlying member method code with example usage: obj.test_StatePrep_broadcasting() without return types