When should I use mocking or simulation in testing?

When should I use mocking or simulation in my tests?

You should use mocking when you want to isolate a unit of code and simulate its dependencies. Simulation is useful for mimicking complex systems.

Can you give me an example of when to use each?

Sure! Use mocking when testing a function that calls an external API. Use simulation when testing how a system behaves under load.

What are the benefits of using these techniques?

Mocking helps in faster tests and reduces flakiness, while simulation allows for testing in a controlled environment.

Are there any downsides to using them?

Yes, over-mocking can lead to tests that don't reflect real-world scenarios, and simulations can be complex to set up.