如何模拟axios API调用？使用jest

npm install --save-dev jest axios

import axios from 'axios';

const API_URL = 'https://api.example.com';

export const fetchData = async (endpoint) => {
  try {
    const response = await axios.get(`${API_URL}/${endpoint}`);
    return response.data;
  } catch (error) {
    throw new Error(`Failed to fetch data from ${endpoint}`);
  }
};

import { fetchData } from './api';

jest.mock('axios');

describe('fetchData', () => {
  it('should fetch data successfully', async () => {
    const mockData = { id: 1, name: 'John Doe' };
    axios.get.mockResolvedValueOnce({ data: mockData });

    const result = await fetchData('users');

    expect(result).toEqual(mockData);
    expect(axios.get).toHaveBeenCalledWith('https://api.example.com/users');
  });

  it('should throw an error when failed to fetch data', async () => {
    const errorMessage = 'Failed to fetch data from users';
    axios.get.mockRejectedValueOnce(new Error(errorMessage));

    await expect(fetchData('users')).rejects.toThrow(errorMessage);
    expect(axios.get).toHaveBeenCalledWith('https://api.example.com/users');
  });
});

npx jest