javascript - 使用sinon如何避免测试嵌套函数？

Question

我正在使用 mocha/chai/sino，而且我对这三个还很陌生。

const a = () => {
  b();
}

const b = () => {
  console.log('here');
}

在此示例中，我只想测试在调用 a 而不执行 b 时是否调用了 b。

类似于:

it('test', () => {
  const spy = sinon.spy(b);
  a();
  chai.expect(spy.calledOnce).to.be.true;
})

Answer 1

Sinon 的 stub 就是您正在寻找的内容。

Sinon Stubs

When to use stubs? Use a stub when you want to:

1. Control a method’s behavior from a test to force the code down a specific path. Examples > include forcing a method to throw an error in order to test error handling.

2. When you want to prevent a specific method from being called directly (possibly because it triggers undesired behavior, such as a XMLHttpRequest or similar).

it('test', () => {
  const stub = sinon.stub(b);
  a();
  chai.expect(stub.calledOnce).to.be.true;
})