@Test
 public void testGetProbability() {
   GaussianCDF tester = new GaussianCDF(5, 10);
   assertTrue("Result", 0.3445783620526301 == tester.getProbability(1));
 }
 @Test
 public void testgetDescription() {
   GaussianCDF tester = new GaussianCDF();
   assertTrue(
       "Result", "Gaussian cumulative probability density function" == tester.getDescription());
 }