Practice - Spies (Partial Mocks): Observing Real Objects
Practice Questions
Test your understanding with targeted questions
What is the main purpose of using a spy in unit testing?
💡 Hint: Think about what spies can do that regular mocks cannot.
Describe a scenario where using a spy is more beneficial than using a mock.
💡 Hint: Consider notifications, external API calls, or similar situations.
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Interactive Quizzes
Quick quizzes to reinforce your learning
What does a spy do in unit testing?
💡 Hint: Think about the roles of different test doubles in unit testing.
True or False: A spy cannot verify that a method was called with the correct number of arguments.
💡 Hint: Consider what spies are meant to track.
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Challenge Problems
Push your limits with advanced challenges
Given a complex class with several methods, create a unit test using spies to verify method calls without altering any real behavior.
💡 Hint: Consider focusing on one method and checking its invocation parameters.
Analyze how you could refactor a test where multiple spies are used, potentially complicating the readability and maintenance.
💡 Hint: Think about if all spies are necessary or if some behaviors can be validated using fewer spies.
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Reference links
Supplementary resources to enhance your learning experience.