MERN 单元测试失败

Question

我正在尝试开发 MERN 应用程序。但是 MERN POST 方法单元测试失败并出现以下错误

错误：

1 失败

POST/product/save/ 好的，创建一个新产品有效： AssertionError: 预期 { error: { errors: { …(5) }, …(3) } } 有属性 '_id' 在上下文中。 (test/api/product/post.js:33:29) 在 processTicksAndRejections（节点：internal/process/task_queues:96:5

我附上了下面的代码。

MERNProject/products.js

const mongoose = require("mongoose");

const postSchema = new mongoose.Schema({
  productName: {
    type: String,
    required: true,
  },
  description: {
    type: String,
    required: true,
  },
  price: {
    type: String,
    required: true,
  },
  productCategory: {
    type: String,
    required: true,
  },
  productUrl: {
    type: String,
    required: true,
  },
});

module.exports = mongoose.model("Products", postSchema);

MERNProject/routes/products.js

    const express = require("express");
const Products = require("../models/products");

const router = express();

//save Products
router.post("/product/save", (req, res) => {
  let newProduct = new Products(req.body);

  newProduct.save((err) => {
    if (err) {
      return res.status(400).json({
        error: err,
      });
    }
    return res.status(200).json({
      success: "Product saved successfuly",
    });
  });
});

module.exports = router;

MERNProject/test/api/post.js

   const expect = require("chai").expect;
    const request = require("supertest");
    
    const app = require("../../../routes/products.js");
    const conn = require("../../../server.js");
    
    describe("POST /product/save/", () => {
      before((done) => {
        conn
          .connect()
          .then(() => done())
          .catch((err) => done(err));
      });
    
      after((done) => {
        conn
          .close()
          .then(() => done())
          .catch((err) => done(err));
      });
    
      it("OK, creating a new product works", async () => {
        const res = await request(app).post("/product/save/").send({
          productName: "Mango",
          description: "description Mango",
          price: "rs 50",
          productCategory: "fruits",
          productUrl:
            "https://upload.wikimedia.org/wikipedia/commons/9/90/Hapus_Mango.jpg",
        });
    
        const body = res.body;
        expect(body).to.contain.property("_id");
        expect(body).to.contain.property("productName");
        expect(body).to.contain.property("description");
        expect(body).to.contain.property("price");
        expect(body).to.contain.property("productCategory");
        expect(body).to.contain.property("productUrl");
      });
    });

MERNProject/server.js

const express = require("express");
const mongoose = require("mongoose");
const bodyParser = require("body-parser");
const cors = require("cors");

const app = express();

//import routes
const postRoutes = require("./routes/products");

//app middleware
app.use(bodyParser.json());
app.use(cors());

app.use(postRoutes);

const PORT = 8000;
const DB_URL =
  "mongodb+srv://twg:twg123@cluster0.ong7q.mongodb.net/myFirstDatabase?retryWrites=true&w=majority";

function connect() {
  return new Promise((resolve, reject) => {
    mongoose
      .connect(DB_URL)
      .then((res, err) => {
        if (err) return reject(err);
        //console.log(`DB connected`);
        resolve();
      })
      .catch((err) => console.log(`DB connection error`, err));
  });
}

function close() {
  return mongoose.disconnect();
}

connect();

app.listen(PORT, () => {
  console.log(`App is running on ${PORT}`);
});

module.exports = { connect, close };

Answer 1

您的 post 请求可能返回了一个错误，并且 body 包含一个错误而不是您期望的对象。从痕迹上看，好像是这样的：

{ error: { errors: { …(5) }, …(3) } }

我会说你的测试工作正常，断言引发错误并且测试失败:)

要进一步调查，您应该记录 res

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