javascript - 如何模拟 readline.createInterface()？

Question

我正在尝试在 jasmine 上编写测试以检查是否调用了 readline.createInterface()，但我不断收到一条错误消息:TypeError: readline.createInterface is not一个函数

这是我在游戏课上的大致内容:

run() {
  let rl = readline.createInterface({
      input: process.stdin,
      output: process.stdout,
      prompt: 'OHAI> '
    });

  rl.prompt();
  // ... and the rest ... 
}

和我的测试:

describe('run', () => {
  it('should create readline interface', () => {
    let readline = jasmine.createSpyObj('readline', ['createInterface']);

    game.run();

    expect(readline.createInterface).toHaveBeenCalled();
  });
});

有人有什么建议吗？

Answer 1

尝试以下代码(见上文)并使用 rewire

const rewire = require('rewire')
const game = rewire('path/to/game')

describe('run', () => {
  it('should create readline interface', () => {
    const readline = jasmine.createSpyObj('readline', ['createInterface']);
    const revert = game.__set__('readline', readline);

    game.run();

    expect(readline.createInterface).toHaveBeenCalled();

    revert();
  });
});