Some methods for testing a GUI include:

1. Unit testing: Testing individual components or widgets in isolation.

2. Integration testing: Testing how components interact with each other.

3. System testing: Testing the entire GUI as a whole.

4. User acceptance testing (UAT): Testing the GUI with real users to ensure it meets requirements.

5. Visual testing: Verifying the GUI's appearance and layout.

6. Usability testing: Evaluating the GUI's user experience and ease of use.

7. Compatibility testing: Testing the GUI on different platforms, browsers, or devices.

8. Accessibility testing: Ensuring the GUI is usable by people with disabilities.

9. Automated testing: Using tools to simulate user interactions and test the GUI.

10. Manual testing: Human testers interact with the GUI to identify issues.

11. Exploratory testing: Testers explore the GUI to discover new issues.

12. Scripted testing: Testers follow a predefined script to test the GUI.

These methods help ensure the GUI is stable, functional, and provides a good user experience.