All posts by Pramod T P

Performance Testing

There are several different types of performance testing in most testing methodologies, for example: performance testing is measuring how a system behaves under an increasing load (both numbers of users and data volumes), load testing is verifying that the system can operate at the required response times when subjected to its expected load, and stress testing is finding the failure point(s) in the system when the tested load exceeds that which it can support.

Acceptance Testing

The acceptance testing part of a testing methodology is the final phase of functional software testing and involves making sure that all the product/project requirements have been met and that the end-users and customers have tested the system to make sure it operates as expected and meets all their defined requirements:

System Testing

The system testing part of a testing methodology involves testing the entire system for errors and bugs. This test is carried out by interfacing the hardware and software components of the entire system (that have been previously unit tested and integration tested), and then testing it as a whole. This testing is listed under the black-box testing method, where the software is checked for user-expected working conditions as well as potential exception and edge conditions.

Integration Testing

The Integration testing part of a testing methodology is the testing of the different modules/components that have been successfully unit tested when integrated together to perform specific tasks and activities (also known as scenario testing). This testing is usually done with a combination of automated functional tests and manual testing depending on how easy it is to create automated tests for specific integrated components.

Unit Testing

The Unit testing part of a testing methodology is the testing of individual software modules or components that make up an application or system. These tests are usually written by the developers of the module and in a test-driven-development methodology (such as Agile, Scrum or XP) they are actually written before the module is created as part of the specification. Each module function is tested by a specific unit test fixture written in the same programming language as the module.

Software Testing

Software testing is an investigation conducted to provide stakeholders with information about the quality of the product or service under test.[1] Software testing can also provide an objective, independent view of the software to allow the business to appreciate and understand the risks of software implementation. Test techniques include the process of executing a program or application with the intent of finding software bugs (errors or other defects).

It involves the execution of a software component or system component to evaluate one or more properties of interest. In general, these properties indicate the extent to which the component or system under test:

  • meets the requirements that guided its design and development,
  • responds correctly to all kinds of inputs,
  • performs its functions within an acceptable time,
  • is sufficiently usable,
  • can be installed and run in its intended environments, and
  • achieves the general result its stakeholders desire.

Object Relational Mapping

ORM(for Object Relational Mapping) is a programming technique used to convert different types of data to Objects and vice versa.

In Magento, ORM is shown as Model which further breaks down to two types of Models – Simple and EAV.

All Magento Models interacting with database are inherited from Mage_Core_Model_Abstract class, which is further inherited from Varien_Object.

Difference between two Models is, Simple Model is inherited from Mage_Core_Model_Resource_Db_Abstract class,
while EAV is inherited from Mage_Eav_Model_Entity_Abstract.

How Magento MVC Works

  1. When Magento website receive a request,it will be intercepted by index.php file
  2. Index.php will instantiates magento application
  3. Magento application will instantiates Front Controller Object
  4. Front controller object will instantiates Router objects (speciafied in config.xml tag)
  5. Router object check for the frontname in modules
  6. If any match is found corresponding controller function will be called
  7. Controller function can instantiates layout object that calls blocks at the same time it can communicate with model functions too.
  8. Block also can communicate with models which defines business logic + database operation
  9. Block will decide the phtml file to be loaded and phtml file displays output for the URL requested.

GZIP Compression

When a user hits your website a call is made to your server to deliver the requested files.

The bigger these files are the longer it’s going to take for them to get to your browser and appear on the screen.

Gzip compresses your webpages and style sheets before sending them over to the browser. This drastically reduces transfer time since the files are much smaller.

In terms of cost versus benefit, gzip compression should be near the top of your page speed optimizations if you don’t have it setup already.