// -------------------------------------------------------------------------
 public void test_equals_similarSeriesAreEqual() {
   LocalDateDoubleTimeSeries series1 = LocalDateDoubleTimeSeries.of(DATE_2014_01_01, 1d);
   LocalDateDoubleTimeSeries series2 =
       LocalDateDoubleTimeSeries.builder().putAll(dates(DATE_2014_01_01), values(1d)).build();
   assertEquals(series1.size(), 1);
   assertEquals(series1, series2);
   assertEquals(series1, series1);
   assertEquals(series1.hashCode(), series1.hashCode());
 }