unit-test

Writing unit tests for React components involves designing test cases, mocking modules and APIs to isolate the component, and using assertion techniques to verify rendered output and interactions.

Mocking APIs and modules in Jest involves replacing external dependencies with controlled mocks to isolate the unit under test. This ensures your test cases evaluate component logic without triggering real network requests.

Yes, this approach works with Vue test utils. It provides comprehensive guidance for writing unit tests in frontend applications, covering test case design and mocking strategies specifically for Vue components.

Designing test cases for boundary and error conditions requires creating a comprehensive set of scenarios that target normal operations, edge cases, and expected failures to ensure your utility functions maintain reliability.

You need to mock timers in a unit test when evaluating functions that rely on asynchronous callbacks, delays, or intervals. Mocking timers isolates the unit under test and allows assertions to execute deterministically.