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Quality assurance (QA) testing is the process of ensuring that your product is of the highest possible quality for your customers. QA is simply the techniques used to prevent issues with your software product or service and to ensure great user experience for your customers.
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Unit Testing involves verification of individual components or units of source code. A unit can be referred to as the smallest testable part of any software. It focuses on testing the functionality of individual components within the application. It is often used by developers to discover bugs in the early stages of the development cycle.
Integration testing is the next step after unit testing. Multiple units are integrated to be tested as a whole. For example, testing a series of webpages in a particular order to verify interoperability. This approach helps QAs evaluate how several components of the application work together to provide the desired result.
As the name suggests, system testing involves testing all the integrated modules of the software as a whole. It helps QAs verify whether the system meets the desired requirements. It includes multiple tests like validating output based on specific input, testing user experience and more. Teams perform several types of system testing like regression testing, stress testing, functional testing and more, depending on their access to time and resources.
UI testing must take into account the various browsers, browser versions, and devices. People access the internet from a wide range of browser-device-OS combinations, which means that the UI must render and function perfectly from each of them. In other words, cross browser testing must be an essential part of any UI testing strategy.
Acceptance testing is performed both internally and externally. Internal acceptance testing (also known as alpha testing) is performed by the members of the organization. External testing (also known as beta testing) is performed by a limited number of actual end-users. This approach helps teams evaluate how well the product satisfies the user’s standards. It also identifies bugs in the last stage before releasing a product.