public Range(T start, Stepper<T> stepper) {
		this(start, null, stepper);
	}
@Test
	public void rangeContains() {
		// 开始区间
		DateTime start = DateUtil.parse("2017-01-01");
		DateTime end = DateUtil.parse("2017-01-31");
		DateRange startRange = DateUtil.range(start, end, DateField.DAY_OF_YEAR);
		// 结束区间
		DateTime start1 = DateUtil.parse("2017-01-31");
		DateTime end1 = DateUtil.parse("2017-02-02");
		DateRange endRange = DateUtil.range(start1, end1, DateField.DAY_OF_YEAR);
		// 交集
		List<DateTime> dateTimes = DateUtil.rangeContains(startRange, endRange);
		assertEquals(1, dateTimes.size());
		assertEquals(DateUtil.parse("2017-01-31"), dateTimes.get(0));
	}