code: def test_scalar_lhs(self, xp, dtype1, dtype2):
      scalar = xp.dtype(dtype1).type(10).item()
      return xp.append(scalar, xp.arange(20, dtype=dtype2))
  
imports: import unittest
  import pytest
  import numpy
  import cupy
  from cupy import testing
label_desc: Use image node_id 2 for calling the TestAppend obj's underlying member method code with example usage: obj.test_scalar_lhs(xp, dtype1, dtype2) and returns: xp