public function testReadonlyField()
 {
     $field = new DropdownField('FeelingOk', 'Are you feeling ok?', array(0 => 'No', 1 => 'Yes'));
     $field->setEmptyString('(Select one)');
     $field->setValue(1);
     $readonlyField = $field->performReadonlyTransformation();
     preg_match('/Yes/', $field->Field(), $matches);
     $this->assertEquals($matches[0], 'Yes');
 }