Understanding Mocking
Explore the concept of mocking in Jest testing for React apps. Understand the role of mocks, stubs, and spies in creating reliable tests while managing trade-offs in test maintenance and confidence.
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We'll cover the following...
What is a mock?
A mock is a type of test double. A test double is a replacement for part of a codebase to make testing easier. For instance, web API calls are often mocked. This is useful for a few reasons:
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To ensure the web API call response is consistent. The data behind the real web API will probably change over time, causing the real web API response to vary.
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To speed up the test. Web API requests are slow.
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To reduce costs if the web API is a third-party paid ...