public function testIsPartiallyFilled_returnsTrueIfChoiceAndDayEmpty()
 {
     $field = new DateField('name', array('data_timezone' => 'UTC', 'user_timezone' => 'UTC', 'widget' => 'choice'));
     $field->submit(array('day' => '', 'month' => '6', 'year' => '2010'));
     $this->assertTrue($field->isPartiallyFilled());
 }