Aleksandar Krstic

Personal Blog

Magento – Readiness Check shows non-existing error during the installation of Magento extension.

During the extension installation (via Component Manager in Magento backend) I got some weird message in Readiness Check step (PHP Settings section).

“Your current PHP memory limit is 2048M. Magento 2 requires it to be set to 768M or more. As a user with root privileges, edit your php.ini file to increase memory_limit. (The command php –ini tells you where it is located.) After that, restart your web server and try again.”

So, if my memory limit in php.ini is set to 2048MB, how is that less than 768MB? (and yes, I double checked php.ini on correct location).

Here looks like that issue is not related with memory limit at all, anyway until I find out what is actual problem here this is the workaround if you want to continue with extension installation process.

      Locate file PATH-TO-YOUR-MAGENTO-SITE\setup\src\Magento\Setup\Model\PhpReadinessCheck.php
      Update error variable to false in the checkMemoryLimit function (line 201)
if (
            $currentMemoryInteger > 0
            && $this->dataSize->convertSizeToBytes($currentMemoryLimit)
            < $this->dataSize->convertSizeToBytes($minimumRequiredMemoryLimit)
        ) {
	    //$error = true;
            $error = false;
            $message = sprintf(
                'Your current PHP memory limit is %s.
                 Magento 2 requires it to be set to %s or more.
                 As a user with root privileges, edit your php.ini file to increase memory_limit. 
                 (The command php --ini tells you where it is located.) 
                 After that, restart your web server and try again.',

As you can see, logic for displaying error was correct, but for some reason error gets displayed, and process cannot be continued.

This is just (not so clean) workaround, so if some of readers of this post find real solution, please send the feedback.

Speed up Magento on localhost

Some of you experienced for sure how Magento can be slow on localhost (either you use XAMPP, WAMPP or whatever).

There are a few things that can be done in order to speed up Magento on localhost:

1. Increase memory in php.ini and .htaccess file


Main Magento .htaccess
php_value memory_limit 2048M

2. Enable Cache
Go to System > Cache Management in Magento backend and enable cache for everything listed

3. Static content deploy
Run the following command in terminal (make sure to navigate to Magento site folder first)
php bin/magento setup:static-content:deploy

CSS – How to fix the issue with fixed background on scroll in iOS

Your client want to have a fixed background when user scroll down? First thought – piece of cake, and really it is if you disregard the fact that users with iPhone or iPad like to scroll also.

This piece of code will work for every device except ones that have iOS (iPhone, iPad)

body {
    background-image: url("PATH-TO-YOUR-IMAGE");
    overflow-x: hidden;
    background-attachment: fixed;
    position: relative;
    -webkit-background-size: cover;
    -moz-background-size: cover;
    background-size: cover;
    width: 100%;
    height: 100%;

Why is that the case here? Per my understanding, Apple disabled position: fixed or background-attachment: fixed style for body element.

So what to do?

1. Open and close div inside of body element

<div class="ios-fixed-bg"></div>

2. Apply the following style to class ios-fixed-bg

.ios-fixed-bg {
	background-image: url("PATH-TO-YOUR-IMAGE");
	height: 100%;
	width: 100%;
	position: fixed;
	background-position: center;
	background-repeat: no-repeat;
	-webkit-background-size: cover;
        -moz-background-size: cover;
        background-size: cover;
	z-index: -1;

Coded UI – Finding Controls – Best Practices

In one of the previous posts I mentioned the ability to use parent-child relations in order to find controls, and in this article I’ll share my experience and what I find as best practice for finding controls.

  1. Always look for ID or Friendly Name. Everythig else try to avoid, especially Tag Instance.
  2. In case that element doesn’t have one of these two, find parent that have.
  3. If both elements – child and parent doesn’t have any of these two, find parent that does

Why is finding ID or Friendly Name important? Simply, ID should be always unique, and Friendly Name is usually unique at least on current page.


<div id=”ihaveid”>
	<div> <!-- child1 – first child of div with id -->
		<div> <!-- child2 – first child of child1 -->
			<span>This is what I want to find</span> <!-- child3 – first child of child2 -->

So, logic here is to find child inside of child until you get where you want to be.

public HtmlDiv FindDivById(UITestControl parent, string id)
            var parentdiv= new HtmlDiv(parent);
            parentdiv.SearchProperties.Add(HtmlDiv.PropertyNames.Id, id);
            return parentdiv;
var parent = FindListById(browser, "ihaveid");
var child1 = parent.GetChildren()[0];  // 0 is 1st child, 1 is 2nd child, ….
var child2 = child1.GetChildren()[0]; 
var child3 = child3.GetChildren()[0];
Mouse.Click(child3);    // this is in case that you want to click on it, but logic is same for any other operation

As you see, logic is very simple. Find nearest parent element that have unique control(s) and search for child elements inside of it.

In my example elements used are div and span, but really you can use it in every combination with lists, paragraphs, …

Security Testing – SQL Injection

For many testers Security Testing is grey area.

One of common ways to test security of your web application is SQL Injection.

In this post I’ll cover basic testing with one of popular free tools – SQLMap –

This tool support wide range of database systems – MySQL, Oracle, PostgreSQL, Microsoft SQL Server, Microsoft Access, IBM DB2, SQLite, Firebird, Sybase, SAP MaxDB, HSQLDB and Informix database management systems.

How to use it?

Following steps are for MS SQL Server, but logic is same for all other types.

  1. Download and install Python –
    *Use 2.7.12 version, because version 3 is not supported
  2. Download and extract sqlmap –
  3. Go to your browser, run application that you want to test
  4. Click F12 in your browser and go to Network tab, so you can track http requests
  5. pen1

  6. Navigate to field which you want to use for injection – e.g. First Name input field in some form, fill all required data and click Next/Submit button
  7. In Network tab find request that was sent and collect data for your request
    It’s something like this
  8. pen2

  9. You will usually need to handle json requests, so in this example we will use that type of request. Create json request based on data you found in Network and save it as .txt file.
  10. pen3

  11. Run CMD as Administrator
  12. Type following command
    C:\Python27\python.exe C:\PATH-TO-EXTRACED-SQLMAP-FILES\ -r C:\PATH-TO-TXT-FILE-WITH-SAVED-POST\penetration.txt -p PARAMETER-YOU-WANT-TO-TEST –dbms=”Microsoft SQL Server”

    *First path is location where Python is installed
    *Second path is location where sqlmap is extracted
    *Third path is location where you saved your post as txt
    -p is parameter that you want to use for injection. If you look image from above, we can use CardHolderName
    –dbms is type of db Management System, you can leave it blank, tool will try process for every supported dbms.
    Beside this, there are a lot of options that can be used –

  13. After execution of this command you will get a few Yes/No or Continue/Quit prompts, and of course select Yes or Continues (by typing Y or C in command line)
  14. At the end you will get report is it your application vulnerable to SQL Injections or not.