@Test
public void testGapsFiller1() {

  Pair<long[], double[][]> fillGaps = Charts.fillGaps(new long[]{0L}, new long[][]{{1L, 2L, 3L}},
          10, 3);
  Assert.assertEquals(0L, fillGaps.getFirst()[0]);
  Assert.assertEquals(3d, fillGaps.getSecond()[0][2], 0.01);
}