@Test
 public void testDeltaDist() {
   System.out.println("deltaDist");
   int[] dist = {0, 0, -1, 1, 0};
   int length = 2;
   int shift = 2;
   double[] weights = {1, 1, 1, 1, 1, 1, 1, 1};
   double result = FidelDecoder.deltaDist(dist, length, shift, weights);
   assertEquals(-8, result, 0.0);
 }