@Test public void shouldGoThroughTheMatrixInSpiral() {

  int[][] matrix = {
      { 1, 2, 3, 4, 5, 6 }, { 20, 21, 22, 23, 24, 7 }, { 19, 32, 33, 34, 25, 8 },
      { 18, 31, 36, 35, 26, 9 }, { 17, 30, 29, 28, 27, 10 }, { 16, 15, 14, 13, 12, 11 }
  };
  int[] result = goThroughMatrixInSpiral.go(matrix);
  int[] expected = {
      1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25,
      26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36
  };
  assertArrayEquals(expected, result);
}