Reactjs 使用jest如何覆盖对象的模拟我正在使用`jest.mock()`来模拟对象，并希望 for each 测试用例覆盖模拟.

不需要将factory参数传递给jest.mock()，只需让JEST在需要时使用自动模拟版本模拟模块即可.

这意味着obj.items将被替换为空数组[]，原始的obj.search()方法将被替换为jest.fn().您可以通过赋值来更改每个测试用例中obj.items属性值.

例如.

obj.js:

const obj = {
    search: () => 'real implementation',
    items: [0, 0, 0],
};

export { obj };

index.test.js:

import { obj } from './obj';

jest.mock('./obj');

describe('76570418', () => {
    test('should pass 0', () => {
        expect(obj.items).toHaveLength(0);
        expect(jest.isMockFunction(obj.search)).toBeTrue();
    });
    test('should pass 1', () => {
        obj.items = [1, 2, 3];
        expect(obj.items).toHaveLength(3);
        expect(jest.isMockFunction(obj.search)).toBeTrue();
    });
    test('should pass 2', () => {
        obj.items = [];
        expect(obj.items).toHaveLength(0);
        expect(jest.isMockFunction(obj.search)).toBeTrue();
    });
    test('should pass 3', () => {
        Object.assign(obj, { items: [1], a: 1 });
        expect(obj.items).toHaveLength(1);
        expect(obj.a).toBe(1);
        expect(jest.isMockFunction(obj.search)).toBeTrue();
    });
});

测试结果:

 PASS  stackoverflow/76570418/index.test.js (7.347 s)
  76570418
    ✓ should pass 0 (1 ms)
    ✓ should pass 1 (1 ms)
    ✓ should pass 2
    ✓ should pass 3 (1 ms)

Test Suites: 1 passed, 1 total
Tests:       4 passed, 4 total
Snapshots:   0 total
Time:        7.616 s