When should I use spies in testing?
Spies are useful when you want to track how a function is called without altering its behavior. They help in verifying interactions.
Can you give me an example of when to use a spy?
Sure! If you have a function that makes an API call, you can use a spy to check if it was called with the correct parameters.
What are the benefits of using spies over mocks?
Spies allow you to observe function calls without replacing the original function, while mocks replace the function entirely, which can limit testing.
Are there any downsides to using spies?
Yes, if not used carefully, spies can lead to tests that are too dependent on implementation details, making them fragile.
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