@Test
  public void groupOfSerieShouldRetrieveOnlyDataSinceTimeStamp() {
    Serie serie1 = new Serie("serie1");
    serie1.addSample(1, 1);
    serie1.addSample(2, 1);
    serie1.addSample(3, 1);

    Serie serie2 = new Serie("serie2");
    serie2.addSample(1, 2);
    serie2.addSample(2, 2);
    serie2.addSample(3, 2);

    Series series = new Series();
    series.addSerie(serie1.getLegend(), serie1);
    series.addSerie(serie2.getLegend(), serie2);

    assertThat(series.getDatas(serie1.getLegend(), 0).size(), is(3));
    assertThat(series.getDatas(serie2.getLegend(), 0).size(), is(3));

    assertThat(series.getDatas(serie1.getLegend(), 1).size(), is(3));
    assertThat(series.getDatas(serie2.getLegend(), 1).size(), is(3));

    assertThat(series.getDatas(serie1.getLegend(), 2).size(), is(2));
    assertThat(series.getDatas(serie2.getLegend(), 2).size(), is(2));

    assertThat(series.getDatas(serie1.getLegend(), 3).size(), is(1));
    assertThat(series.getDatas(serie2.getLegend(), 3).size(), is(1));
  }