public function testSingle()
 {
     $prm = Primitive::timestamp('test')->setSingle();
     $array = array('test' => '1234-01-02 17:38:59');
     $this->assertTrue($prm->import($array));
     $this->assertTrue($prm->getValue()->getYear() == 1234);
     $array = array('test' => '1975-01-02 17:38:59');
     $this->assertTrue($prm->import($array));
     $this->assertEquals($prm->getValue()->toDateTime(), '1975-01-02 17:38.59');
 }