public function testFilterFormat()
{
$filter = new DateTime('Y-m-d H:i:s');
$expect = new \DateTime('2010-10-10 00:00:00');
$this->assertEquals('2010-10-10 00:00:00', $filter->apply($expect));
$this->assertEquals('2010-10-10 00:00:00', $filter->apply('10.10.2010'));
$this->assertEquals(false, $filter->apply('foobar'));
// test error message
$this->assertErrorMessage($filter->getErrorMessage());
}
