Service Stub pattern

[jdoetricksy]

Description

The Service Stub design pattern is used to create a simplified version of a service that mimics the behavior of a real service in a controlled manner. This is especially useful during development and testing phases when the actual service might be unavailable or its usage might be costly or impractical. The stub can return predefined responses and simulate various scenarios to ensure the application behaves as expected.

Main Elements of the Pattern:

• Stub Creation: Develop a stub that implements the same interface as the real service.
• Predefined Responses: Configure the stub to return predefined responses based on input parameters.
• Behavior Simulation: Simulate various behaviors such as success, failure, and exceptions.
• Seamless Replacement: Ensure the stub can be seamlessly replaced with the real service with minimal changes to the application code.

References

1. Service Stub Pattern - Martin Fowler
2. Mock and Stub in Unit Testing
3. Java Design Patterns Wiki - Contribution Guidelines

Acceptance Criteria

1. Create a new package service-stub under the patterns directory.
2. Implement the service stub following the principles of the pattern, including predefined responses and behavior simulation.
3. Provide comprehensive unit tests to validate the stub's behavior in different scenarios.
4. Update the README with an explanation of the Service Stub pattern, including example usage and code snippets.

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