@Test public void testFormatDurationISO() { assertEquals("P0Y0M0DT0H0M0.000S", DurationFormatUtils.formatDurationISO(0L)); assertEquals("P0Y0M0DT0H0M0.001S", DurationFormatUtils.formatDurationISO(1L)); assertEquals("P0Y0M0DT0H0M0.010S", DurationFormatUtils.formatDurationISO(10L)); assertEquals("P0Y0M0DT0H0M0.100S", DurationFormatUtils.formatDurationISO(100L)); assertEquals("P0Y0M0DT0H1M15.321S", DurationFormatUtils.formatDurationISO(75321L)); }