public function testIsValid_FieldBetween()
{
// mock of document
$document = $this->getMock('\\Sokil\\Mongo\\Document', array('rules'), array($this->collection));
$document->expects($this->any())->method('rules')->will($this->returnValue(array(array('some-field-name', 'between', 'min' => 6, 'max' => 14))));
$document->set('some-field-name', 1);
$this->assertFalse($document->isValid());
$document->set('some-field-name', 8);
$this->assertTrue($document->isValid());
$document->set('some-field-name', 19);
$this->assertFalse($document->isValid());
}