code: def test_setdiff1d_unique(self):
      a = np.array([3, 2, 1])
      b = np.array([7, 5, 2])
      expected = np.array([3, 1])
      actual = setdiff1d(a, b, assume_unique=True)
      assert_equal(actual, expected)
  
imports: import numpy
  from numpy import ediff1d, intersect1d, setxor1d, union1d, setdiff1d, unique, isin
  from numpy.exceptions import AxisError
  from numpy.testing import assert_array_equal, assert_equal, assert_raises, assert_raises_regex
  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_unique() without return types