@Test
public void testFullCorrelation1() throws Exception {

  DataModel dataModel = getDataModel(
          new long[] {1, 2},
          new Double[][] {
                  {1.0, 2.0, 3.0},
                  {1.0, 2.0, 3.0},
          });
  double correlation = new SpearmanCorrelationSimilarity(dataModel).userSimilarity(1, 2);
  assertCorrelationEquals(1.0, correlation);
}