@Test
 public void testGenerateRecruitmentChart2() throws IllegalArgumentException, TrialStateException {
   randomizeInValidTrialTwoYears();
   ChartData chartData = chartsService.generateRecruitmentChart(validTrial);
   assertEquals(24, chartData.getXLabels().size());
   assertEquals(24, chartData.getData().size());
   for (int i = 0; i < chartData.getData().size(); i++) {
     assertEquals(10.0 * (i + 1), chartData.getData().get(i)[0]);
     assertEquals(10.0 * (i + 1), chartData.getData().get(i)[1]);
   }
 }