@Test
public void testParseRepeatablePeriodOnly() {

    String isoString = "R/PT1M";
    long[] parsedRepeatable = DateTimeUtils.parseRepeatableDateTime(isoString);
    assertEquals(-1L, parsedRepeatable[0]);
    // Default delay time is 1000ms
    assertEquals(1000L, parsedRepeatable[1]);
    assertEquals(MINUTE_IN_MILLISECONDS, parsedRepeatable[2],
                            "Parsed period should be one minute in milliseconds but is " + parsedRepeatable[2]);
}