How to use Mocks in Ruby Tests | Preview

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Mocks are an invaluable tool when writing tests. You can use them to replace objects in your test suite so that you can verify your code calls specific methods against them. Mocks also let you stub methods against them just like with regular stubs.

Combine with Dependency Injection, mocks allow you to write tests with interchangeable dependencies. You can use a mock to simulate interaction with an API by creating a fake API as a mock.