code: def test_setdiff1d(self):
      a = np.array([6, 5, 4, 7, 1, 2, 7, 4])
      b = np.array([2, 4, 3, 3, 2, 1, 5])
  
      ec = np.array([6, 7])
      c = setdiff1d(a, b)
      assert_array_equal(c, ec)
  
      a = np.arange(21)
      b = np.arange(19)
      ec = np.array([19, 20])
      c = setdiff1d(a, b)
      assert_array_equal(c, ec)
  
      assert_array_equal([], setdiff1d([], []))
      a = np.array((), np.uint32)
      assert_equal(setdiff1d(a, []).dtype, np.uint32)
  
imports: import numpy
  from numpy.testing import assert_array_equal, assert_equal, assert_raises, assert_raises_regex
  from numpy.lib.arraysetops import ediff1d, intersect1d, setxor1d, union1d, setdiff1d, unique, in1d, isin
  import pytest
label_desc: Use image node_id 26 for calling the TestSetOps obj's underlying member method code with example usage: obj.test_setdiff1d() without return types