问Jest中resetAllMocks、resetModules、resetModuleRegistry、restoreAllMocks的区别

EN

import {Calculator} from './calculator';

describe('calculator add', function () {
    let calculator = new Calculator();
    const mockAdd = jest.spyOn(calculator, 'add');
    it('mock the add method', function () {
        calculator.add = mockAdd.mockReturnValue(5);
        expect(calculator.add(1, 2)).toBe(5);
    });

    it('because we didnt clear mock, the call times is 2', function () {
        expect(calculator.add(1, 2)).toBe(5);
        expect(mockAdd).toHaveBeenCalledTimes(2);
    });

    it('After clear, now call times should be 1', function () {
        jest.clearAllMocks();
        expect(calculator.add(1, 2)).toBe(5);
        expect(mockAdd).toHaveBeenCalledTimes(1);
    });

    it('we reset mock, it means the mock has no return. The value would be undefined', function () {
        jest.resetAllMocks();
        expect(calculator.add(1, 2)).toBe(undefined);
    });

    it('we restore the mock to original method, so it should work as normal add.', function () {
        jest.restoreAllMocks();
        expect(calculator.add(1, 2)).toBe(3);
    });
});