Mockito Spy: Your Complete Guide To Testing With Real Objects
Blog post from Keploy
Mockito Spy is a powerful tool in unit testing that acts as a wrapper around real objects, allowing developers to monitor and partially control their behavior. Unlike Mockito Mocks, which are entirely fake objects used to isolate tests by managing dependencies, spies utilize actual instances while permitting the overriding of specific methods when necessary. This hybrid approach enables the execution of real methods by default, providing a balance between genuine business logic and controlled behavior. Spies are ideal for scenarios involving legacy code testing, partial behavior control, and complex object initialization, where real business logic is needed for most methods but specific actions like database calls are faked. However, they should be used judiciously to avoid unnecessary complexity and performance implications. While spies offer more "real" behavior, they can lead to challenges such as unintended side effects or slower performance compared to mocks, making it crucial to strategically choose when to employ them, ensuring tests remain focused and maintainable.
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