@Override
	public String toString() {
		return getClass().getSimpleName() + "[period=" + getPeriod() + ", startDate="
				+ getStartDate() + ", endDate=" + getEndDate() + ']';
	}
@Test
	public void testToString() {
		final String string = periodRange.toString();
		assertNotNull("toString not null", string);
		assertFalse("toString not empty", string.isEmpty());
		final String string2 = customRange.toString();
		assertNotNull("toString not null", string2);
		assertFalse("toString not empty", string2.isEmpty());
	}