/**
* 以下の確認を行います.
*
* - フィールドの加減が正常に出来ること.
* - 繰り上がり・繰り下がり処理が正常に出来ること.
* - 不正なフィールド名を指定した場合に無視されること.
*
* @covers Peach\DT\Date::add
* @covers Peach\DT\Date::adjust
*/
public function testAdd()
{
$d1 = new Date(2012, 5, 21);
$this->assertEquals(new Date(2015, 5, 21), $d1->add("year", 3));
$this->assertEquals(new Date(2009, 5, 21), $d1->add("year", -3));
$this->assertEquals(new Date(2012, 10, 21), $d1->add("month", 5));
$this->assertEquals(new Date(2011, 12, 21), $d1->add("month", -5));
$this->assertEquals(new Date(2012, 6, 10), $d1->add("date", 20));
$this->assertEquals(new Date(2012, 4, 21), $d1->add("date", -30));
$this->assertEquals(new Date(2011, 5, 21), $d1->add("date", -366));
$this->assertEquals(new Date(2013, 5, 21), $d1->add("date", 365));
$this->assertEquals(new Date(2012, 5, 21), $d1->add("min", 10));
$this->assertEquals(new Date(2012, 5, 21), $d1->add("sec", -10));
$this->assertEquals(new Date(2012, 5, 21), $d1->add("asdf", 20));
}
