如何在reducer中使用jest测试if语句？

npm install --save-dev jest

import reducer from './reducer';

describe('reducer', () => {
  test('should return the correct state when the condition is true', () => {
    // 创建一个初始状态
    const initialState = { count: 0 };

    // 创建一个action，满足if语句的条件
    const action = { type: 'INCREMENT' };

    // 调用reducer函数
    const newState = reducer(initialState, action);

    // 断言新的状态是否符合预期
    expect(newState.count).toBe(1);
  });

  test('should return the correct state when the condition is false', () => {
    // 创建一个初始状态
    const initialState = { count: 0 };

    // 创建一个action，不满足if语句的条件
    const action = { type: 'DECREMENT' };

    // 调用reducer函数
    const newState = reducer(initialState, action);

    // 断言新的状态是否符合预期
    expect(newState.count).toBe(0);
  });
});

npm test