public function testIsLeapYear() { $date = new Zend_Date_DateObject(); $this->assertSame($date->isLeapYear(2000), true); $this->assertSame($date->isLeapYear(2002), false); $this->assertSame($date->isLeapYear(2004), true); $this->assertSame($date->isLeapYear(1899), false); $this->assertSame($date->isLeapYear(1500), true); $this->assertSame($date->isLeapYear(1455), false); }