Selenium WebDriver Advanced - Industry Standard Framework - How to Run Multiple Test Classes

The video tutorial explains how to run multiple test suites using TestNG by creating a TestNG XML file. It covers the steps to define the XML structure, add test classes, and configure the test execution order. The tutorial also demonstrates running the tests, making code adjustments, and observing the test results in a Chrome browser. Key changes include using JavaScript for certain actions and modifying wait times. The tutorial concludes with a successful test execution where all tests pass.

Explain the significance of the 'reserve order' attribute in the TestNG XML file.

What was the outcome of running the test suites as described in the text?