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Complete web testing of a system before going live is the primary step to get assured of an entire web application’s ability to work properly. It can help address such issues like readiness of your web server for the traffic you are expecting and for the increasing number of users (Load testing), the ability to survive a massive spike in user traffic, your server hardware sufficiency and so on. After performing web tests you’ll be able to find bottlenecks in your systems before they happen in a production environment.
Neglecting performance problems can lead not only to poor end-user experience, but even application crashes. Many bugs won't be discovered by testing the system as a single user during the development process, and can only be found when the system is placed under load.
Web Security Testing
Web security testing tells us whether Web based applications requirements are met when they are subjected to malicious input data.
Open Source Web Application Testing Tools
Windows based Web Application Testing Tools
Testing the User Interface of Web applications
Some frameworks give a toolbox for testing Web applications. Consult the table of comparison of Web Testing tools