public function testEquality() { $d1 = new QtiDuration('P1DT12H'); // 1 day + 12 hours. $d2 = new QtiDuration('P1DT12H'); $d3 = new QtiDuration('PT3600S'); // 3600 seconds. $this->assertTrue($d1->equals($d2)); $this->assertTrue($d2->equals($d1)); $this->assertFalse($d1->equals($d3)); $this->assertFalse($d3->equals($d1)); $this->assertTrue($d3->equals($d3)); }