Toplan\PhpSms\Sms::hasAgent PHP Method

    public static function hasAgent($name)
    {
        return isset(self::$agents[$name]);
    }

 public function testHasAgent()
 {
     $this->assertFalse(Sms::hasAgent('Log'));
     $this->assertFalse(Sms::hasAgent('SomeAgent'));
     Sms::getAgent('Log');
     $this->assertTrue(Sms::hasAgent('Log'));
 }