@Test
 public void testConjugate() {
   IComplexNDArray negative = Nd4j.createComplex(new double[] {1, -1, 2, -1}, new int[] {1, 2});
   IComplexNDArray positive = Nd4j.createComplex(new double[] {1, 1, 2, 1}, new int[] {1, 2});
   assertEquals(getFailureMessage(), negative, positive.conj());
 }