@Test
public void thisMonth() throws Exception {

    DateTimePeriod period = DateTimePeriodSelector.thisMonth(DateTimeZone.UTC);
    DateTime now = new DateTime(DateTimeZone.UTC);
    DateTimePeriod expectedPeriod = DateTimePeriod.createMonth(now.getYear(), now.getMonthOfYear(), DateTimeZone.UTC);
    Assert.assertEquals(expectedPeriod, period);
}