public function testDurationSecond() { $duration = new Duration('PT20S'); $this->assertEquals(0, $duration->getYear()); $this->assertEquals(0, $duration->getMonth()); $this->assertEquals(0, $duration->getDay()); $this->assertEquals(0, $duration->getHour()); $this->assertEquals(0, $duration->getMinute()); $this->assertEquals(20, $duration->getSecond()); $this->assertEquals('PT20S', $duration->toString()); }