Yellow Box Testing: Definition, Features, Applications & Examples

Yellow box testing is a software testing technique that focuses on verifying warning messages and alerts within an application. It ensures that the system correctly displays warnings when necessary, helping users make informed decisions.

Key Features of Yellow Box Testing

Checks Warning Messages: Ensures that alerts appear correctly when required.
User Guidance: Helps users understand potential risks or required actions.
Improves User Experience: Ensures warnings are clear and actionable.
Common in UI Testing: Often used in web and mobile applications.

Practical Applications

Banking Applications: Ensures users receive warnings for incorrect account numbers or insufficient funds.
E-commerce Websites: Validates alerts for expired discount codes or out-of-stock items.
Healthcare Systems: Confirms that medication dosage warnings are displayed correctly.
Security Systems: Checks alerts for unauthorized access attempts.

Example: Online Banking System

Imagine an online banking application where a user tries to transfer money but enters an incorrect account number. The system should display a warning message like:

"Invalid account number. Please check and try again."

Yellow box testing ensures that:

The warning message appears at the right time.
The message is clear and understandable.
The system does not proceed with the transaction until the issue is resolved.

Another example is an e-commerce website where a user applies a discount code that has expired. The system should display:

"This discount code is no longer valid. Please use a different code."

Yellow box testing verifies that:

The message appears before checkout.
The user is prompted to enter a valid code.
The system does not apply the expired discount.

This type of testing is crucial for error prevention and user guidance in applications.

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