code: def test_mem_string_concat(self):
      # Ticket #469
      x = np.array([])
      np.append(x, "asdasd\tasdasd")
  
imports: import os
  import numpy
  from numpy.testing import assert_, assert_equal, assert_array_equal, assert_array_almost_equal, assert_raises, _assert_valid_refcount
label_desc: Use image node_id 10 for calling the TestRegression obj's underlying member method code with example usage: obj.test_mem_string_concat() without return types