public function testInvalidFactorShouldThrowFactorException($dividend, $input)
{
$this->setExpectedException(FactorException::class, ValidationException::stringify($input) . ' must be a factor of ' . $dividend);
$min = new Factor($dividend);
$this->assertFalse($min->__invoke($input));
$this->assertFalse($min->assert($input));
}