restoreAllMocks

RestoreAllMocks is a function provided by the Jest testing framework, which is commonly used in JavaScript and TypeScript projects. This function is part of Jest's mocking utilities and is designed to reset all mocks created by Jest's mock functions. It is particularly useful in scenarios where you need to ensure that the state of your mocks is clean before running a new test or suite of tests.

When restoreAllMocks is called, it performs the following actions:

1. Restores all mocks to their original implementations.

2. Clears all instances and calls to the mocks.

3. Resets the mock's implementation to its default state.

This function is typically used in the afterEach or afterAll hooks of a test suite to ensure that each test runs in isolation without interference from previous tests. By using restoreAllMocks, you can avoid issues related to mock state leakage, where the state of a mock from one test affects the outcome of another test.

It is important to note that restoreAllMocks only affects mocks created using Jest's mock functions, such as jest.fn(), jest.spyOn(), and jest.mock(). Other types of mocks or stubs created using different libraries or techniques will not be affected by this function.

In summary, restoreAllMocks is a powerful tool for managing the state of mocks in Jest tests, helping to ensure that tests are reliable and maintainable. By using this function appropriately, developers can create more robust and efficient test suites.