i. GUI testing is a testing technique in which the application's user interface is tested whether the application performs as expected with respect to user interface behavior.

ii. GUI Testing includes the application behavior towards keyboard and mouse movements and how different GUI objects such as toolbars, buttons, menu bars, dialog boxes, edit fields, lists, behaviour to the user input. GUI Testing Guidelines

i. Check Screen Validations

ii. Verify All Navigations

iii. Check usability Conditions

iv. Verify Data Integrity

v. Verify the object states

vi. Verify the date Field and Numeric Field Formats

GUI Automation Tools

Following are some of the open source GUI automation tools in the market: