public function testShouldUseBAVInstanceToValidate()
{
$bank = '10000000';
$input = '67067';
$bav = $this->getBavMock();
$rule = new GermanBankAccount($bank, $bav);
$bav->expects($this->once())->method('isValidBankAccount')->with($bank, $input)->will($this->returnValue(true));
$rule->validate($input);
}