- Valid Input: Enter the correct text or solve the CAPTCHA correctly. This scenario ensures that the system accepts valid input and grants access.
- Incorrect Input: Enter incorrect or random text as the response to the CAPTCHA. Verify that the system rejects the input and prevents access.
- Timing: Complete the CAPTCHA within a reasonable time frame. Test whether the system allows access when the CAPTCHA is solved within the expected time limit.
- Timeout: Attempt to submit the CAPTCHA response after the expiration of the time limit. Verify that the system does not grant access and prompts the user to solve a new CAPTCHA.
- Reloading CAPTCHA: Refresh the CAPTCHA image and solve the new challenge. Ensure that the system validates the new response and grants access upon success.
- Accessibility: Test CAPTCHA’s accessibility features. For example, try solving the audio CAPTCHA option if available. Verify that the audio CAPTCHA is clear and understandable.
- Multiple Attempts: Attempt to solve the CAPTCHA multiple times with the same or different responses. Ensure that the system tracks the number of attempts and denies access after a certain threshold.
- Mobile Responsiveness: Test the CAPTCHA on mobile devices with different screen sizes and resolutions. Verify that the CAPTCHA is legible and user-friendly on smaller screens.
- Cross-browser Compatibility: Verify that the CAPTCHA works properly on various web browsers (e.g., Chrome, Firefox, Safari, Internet Explorer, Edge) and that it is displayed consistently across different browsers.
- Security: Test the CAPTCHA for potential vulnerabilities, such as bypassing the CAPTCHA by inspecting the HTML source code, manipulating cookies, or tampering with the CAPTCHA mechanism.