Problem Statement
What is the best approach to test Redux reducers?
Explanation
Test reducers as pure functions by passing in a known state and action, then asserting that the returned state matches your expectations, without any mocking or complex setup required. Since reducers are pure functions, they are very easy to test in isolation by simply calling them with test data and checking the output. You can test initial state, individual action handlers, edge cases, and state transitions independently, making reducer tests fast, reliable, and maintainable.
Practice Sets
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