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What is a TestNG XML file what is the benefit of using a Testng framework?

In a nutshell, a TestNG XML file is a storage place for all the various test annotations, classes, and methods. It is a handy place to store test results, particularly when the user has to perform multiple tests in parallel.
Most of the time, users have to perform some action before they can access the results of their tests. For example, to load a page on a Web site, login to a bank, sign up for a credit card, etc.
A classic example for this would be to view your profile picture. You might find this test easier to code if you consider it as a gallery.
A gallery is a static container that contains only static images (like a loading screen) while the rest of the test suite is stored in the XML file. It provides a high-level view of the execution flow of a test case similar to a touchscreen.
GitHub is one of the most popular Web sites for software development. Its members include companies like Twitter, Facebook, and more. Thousands of developers use its services every day to host, code, test, and debug their software.

A TestNG XML file is a text file that contains all the necessary information to reproduce the execution of a test case, set of classes, and packages. It is a beautiful concept that underlies most of the testing process we perform every day.

The purpose of a TestNG XML file is to define the execution approach of a test case. The syntax for a TestNG XML file is the same as for a normal JUnit file. However, the execution approach of a test case is different, the execution flow is defined by the XML file and the steps are more specific to the execution stage of the test case.
: This execution approach is more flexible than the others because it allows you to pass multiple information to the test method at runtime, which is useful for your integration testing, etc. The drawback is that this flexibility requires you to recompile your existing suite(s) and test cases, which can slow down your release cycles.
: The glide path for a TestNG test case is different from the others, it is more specific to the execution approach of the test case. The XML file defines the execution approach of the test case in a finer grained detail, which is valuable for your integration testing, etc. The limitation is that this specific execution approach is only supported on Windows and Linux, which is why TestNG is developed on Mac OS X.
: The limitation of TestNG is that it does not support the use of dependency injection as a sole framework component, so you will need to use a framework like CocoaPods, Beanstalk, or …
for your integration testing needs.
: The TestNG team would like to thank everyone for their support over the years and we wish you the very best of success in the future.

The purpose of a TestNG XML file is to store information about the executions of tests, classes, and methods. The annotations in the XML file can be used to modify the execution sequence of a test case, restrict its range, or set it up for parallelism. The parallel mode allows you to execute tests in a parallel manner with the help of tables, graphs, and reports.

Well, its because a TestNG XML file gives us a graphical output of the execution status of the test cases, i.e. black-and-white picture of the result plus the text describing the steps taken to reproduce the result.