/**
* @covers alroniks\dtms\DateTime::sub
*/
public function testSub()
{
$dt = new DateTime('2015-08-08 10:10:10.123456');
$dt->sub(new DateInterval('PT0.000000S'));
$this->assertEquals('1439028610.123456', $dt->format('U.u'));
$dt = new DateTime('2015-08-08 10:10:10.123456');
$dt->sub(new DateInterval('PT1.123456S'));
$this->assertEquals('1439028609.000000', $dt->format('U.u'));
$dt = new DateTime('2015-08-08 10:10:10.123456');
$dt->sub(new DateInterval('PT1.999999S'));
$this->assertEquals('1439028608.123457', $dt->format('U.u'));
$dt = new DateTime('2015-08-08 10:10:10.123456');
$dt->sub(new DateInterval('PT1.876544S'));
$this->assertEquals('1439028608.246912', $dt->format('U.u'));
$dt = new DateTime('2015-08-08 10:10:10.123456');
$dt->sub(new DateInterval('-PT0.000000S'));
$this->assertEquals('1439028610.123456', $dt->format('U.u'));
$dt = new DateTime('2015-08-08 10:10:10.123456');
$dt->sub(new DateInterval('-PT1.123456S'));
$this->assertEquals('1439028611.246912', $dt->format('U.u'));
$dt = new DateTime('2015-08-08 10:10:10.123456');
$dt->sub(new DateInterval('-PT1.999999S'));
$this->assertEquals('1439028612.123455', $dt->format('U.u'));
$dt = new DateTime('2015-08-08 10:10:10.123456');
$dt->sub(new DateInterval('-PT1.876544S'));
$this->assertEquals('1439028612.000000', $dt->format('U.u'));
}
