Testing · Senior · Question 8 of 75

What does “don't mock what you don't own” suggest?

✓Correct answer: Wrap third-party APIs in your own adapter, mock the adapter in unit tests and check the adapter with integration tests
2Never use third-party libraries in tested code
3Mock every third-party library globally

Explanation

A mock of someone else's API encodes your assumptions about it; when the library changes, the mock still passes.

Further reading

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