Jest Mockgoose Doc.save()不能异步/等待工作

Question

我在我的电子商务软件上使用jest，这样我也可以在端到端测试时进行渲染测试(支持主题，这就是为什么)。

但我目前只是在测试一些mongoose功能，当我试图保存文档时，它给出了这个错误：Error: Timeout - Async callback was not invoked within the 10000ms timeout specified by jest.setTimeout.

我注意到，当我使用await doc.save();删除行时，它不会给出这个错误。所以我认为它与async/await有关，但我找不到它。

package.json

"jest": {
  "automock": false,
  "moduleDirectories": [
    "node_modules"
  ],
  "testPathIgnorePatterns": [
    "node_modules",
    ".idea",
    "public"
  ],
  "collectCoverage": true,
  "coverageThreshold": {
    "global": {
      "branches": 5,
      "lines": 40,
      "functions": 25,
      "statements": -1000
    }
  },
  "setupTestFrameworkScriptFile": "./setupJest.js",
  "coverageDirectory": "coverage",
  "globalSetup": "./globalSetupJest.js"
}

globalSetupJest.js

const Mongoose = require('mongoose').Mongoose;
const mongoose = new Mongoose();

const Mockgoose = require('mockgoose').Mockgoose;
const mockgoose = new Mockgoose(mongoose);
const {promisify} = require('util');

module.exports = async () => {
    try {

        await mockgoose.prepareStorage();
        promisify(mongoose.connect);

        await mongoose.connect('mongodb://localhost/test')

        mongoose.connection.on('connected', () => {
            console.log('db connection is now open');
        });

    } catch (e) {
        console.log('error in setting up mockgoose', e);
    }
};

Product.test.js

describe('Product', () => {
    const index = require('./index');
    const productSchema = require('./model');

    const Product = mongoose.model(index.modelName, productSchema);

    describe('Instance Functionality', () => {
        let baseProductObj;
        let localProduct;

        beforeEach(async () => {
            baseProductObj = {
                ean: 123456789,
                title: 'Test product',
                description: 'Test description',
                stock: {
                    amount: 5,
                    track: true
                },
                pricing: {
                    cost: 5,
                    price: 10
                },
                url: 'test-product'
            };
            localProduct = new Product(baseProductObj);
            try {
                return await localProduct.save();
            } catch (e) {
                console.log('error in beforeEach', e);
            }
        });

        describe('.reduceStock', () => {
            test('Should decrease the stock by a default of 1', async () => {
                try {
                    localProduct.reduceStock();
                    await localProduct.save();
                } catch (e) {
                    console.log('error in saving localProduct', e);
                }
                expect(localProduct.stock.amount).toEqual(4);
            });
        });
    });
});

Answer 1

我已经有一段时间没有使用JEST了，但我认为异步代码需要“完成”回调。

你的代码应该是：

test("Should decrease the stock by a default of 1", async (done) => {
  try {
    localProduct.reduceStock();
    await localProduct.save();
    done();
  } catch (e) {
    console.log("error in saving localProduct", e);
  }
  expect(localProduct.stock.amount).toEqual(4);
});

如果不起作用，请尝试返回文档。

await localProduct.save();

应该是

return await localProduct.save();

Answer 2

您可以通过添加以下内容在测试中指定更大的超时：

jest.setTimeout(50000);