Jest: Clearing and restoring mocks

For one mock:

fn.mockClear() // Clears mock usage date (fn.mock.calls, fn.mock.instances)
fn.mockReset() // Clears and removes any mocked return values or implementations
fn.mockRestore() // Resets and restores the initial implementation

Note: mockRestore works only with mocks created by jest.spyOn.

For all mocks:

jest.clearAllMocks()
jest.resetAllMocks()
jest.restoreAllMocks()