监视函数sinon返回的函数

spying on functions returned by a function sinon

本文关键字：函数 返回 sinon 监视      更新时间：2023-09-26

我对Sinon有点陌生，并且在我不仅需要监视函数，而且需要监视函数返回的函数的场景中遇到了一些麻烦。具体来说，我试图模拟Azure Storage SDK，并确保一旦创建了队列服务，队列服务返回的方法也会被调用。下面是示例:

// test.js
// Setup a Sinon sandbox for each test
test.beforeEach(async t => {
    sandbox = Sinon.sandbox.create();
});
// Restore the sandbox after each test
test.afterEach(async t => {
    sandbox.restore();
});
test.only('creates a message in the queue for the payment summary email', async t => {
    // Create a spy on the mock
    const queueServiceSpy = sandbox.spy(AzureStorageMock, 'createQueueService');
    // Replace the library with the mock
    const EmailUtil = Proxyquire('../../lib/email', {
        'azure-storage': AzureStorageMock,
        '@noCallThru': true
    });
    await EmailUtil.sendBusinessPaymentSummary();
    // Expect that the `createQueueService` method was called
    t.true(queueServiceSpy.calledOnce); // true
    // Expect that the `createMessage` method returned by
    // `createQueueService` is called
    t.true(queueServiceSpy.createMessage.calledOnce); // undefined
});

模拟:

const Sinon = require('sinon');
module.exports =  {
    createQueueService: () => {
        return {
            createQueueIfNotExists: (queueName) => {
                return Promise.resolve(Sinon.spy());
            },
            createMessage: (queueName, message) => {
                return Promise.resolve(Sinon.spy());
            }
        };
    }
};

我能够确认queueServiceSpy被调用一次，但是我在确定该方法返回的方法是否被调用(createMessage)时遇到了麻烦。

是否有更好的方法来设置这个，或者我只是错过了什么?

谢谢!

你需要做的是存根你的服务函数返回一个间谍，然后你可以跟踪调用到其他地方。你可以任意地嵌套它(尽管我强烈反对这样做)。

类似:

const cb = sandbox.spy();
const queueServiceSpy = sandbox.stub(AzureStorageMock, 'createQueueService')
    .returns({createMessage() {return cb;}}});
const EmailUtil = Proxyquire('../../lib/email', {
    'azure-storage': AzureStorageMock,
    '@noCallThru': true
});
await EmailUtil.sendBusinessPaymentSummary();
// Expect that the `createQueueService` method was called
t.true(queueServiceSpy.calledOnce); // true
// Expect that the `createMessage` method returned by
// `createQueueService` is called
t.true(cb.calledOnce);

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