public void testFindMinimumRangeValue() {
        CategoryDataset d1 = createCategoryDataset1();
        Number min1 = DatasetUtilities.findMinimumRangeValue(d1);
        assertEquals(new Double(1.0), min1);
        
        XYDataset d2 = createXYDataset1();
        Number min2 = DatasetUtilities.findMinimumRangeValue(d2);
        assertEquals(new Double(100.0), min2);