public function testGetPattern2ReturnMinusOperator()
{
$captcha = new Captcha();
$captcha->setPattern(2);
$this->assertEquals('-', $captcha->getOperator());
}
function testResultOperatorShouldBePlus()
{
$captcha = new Captcha(1, 1, 1, 1);
$operator = $captcha->getOperator();
$this->assertEquals("+", $operator->toString());
}
