Question

我正在学习graphql并想对我的解析器进行单元测试（即查询以获取“答案”）。问题是我的解析器使用mongoose从幕后的mongodb中查询数据，我不知道该如何模拟这些电话。

有人可以帮我吗？谢谢。

我的查询的解析器是这样的：

const { Book, Author } = require('../models')    

module.exports = {
  answers: async ( parent, { searchText } ) => {        
    let authors = null;
    let books = null;
    try {
        authors = await Author.find({});            
        books = await Book.find({}); 
        return getAnswers(authors,books, searchText);
    }catch (err) {
        console.log(err);
    }        
    return null;
 }
}

function getAnswers(books,authors,text) {
    <!-- process data here -->
}

Answer 1

您正在寻找proxyquire。它使您可以覆盖所需文件中的依赖项。您的测试文件可能看起来像这样

const proxyquire = require('proxyquire');
const mockBook = {...}

describe('Test #1', function() {
    const stubs = {
        '../models': {
            Book: {
                find: () => Promise.resolve(mockBook),
            },
            Author: // Same as book
        },
    };

    const myfile = proxyquire('./myfile', stubs);
    let answers;

    before(async function() {
        answers = await myfile.answers();
    });

    describe("should succeed", function() {
        expect(answers).to.be.equal(ExpectedAnswers);
    });
});

现在，该代码尚未运行，并且绝对不会成功。这是为了让您了解如何使用proxyquire。

对于代码的getAnswers()部分，您还需要模拟该函数的依赖关系，就像在上面的示例中对Book所做的那样。

Answer 2

您可以使用 graphql工具 here is a link to the blog

npm install graphql-tools

将架构导入测试文件

import { mockServer } from 'graphql-tools';
import schema from './schema.js';

describe('mock server', () => {
  it('should mock the server call', async () => {
    const myMockServer = mockServer(schema, {
      String: () => 'Hello', // <--- expecting a `hello` to be returned
    });
    const response = await myMockServer.query(`{
      users {
        username,
      }
    }`);

    const expected =  { // This shape of the data returned
      data: {
        users: [
          {
            "username": "Hello"
          },
          {
            "username": "Hello"
          },
       ]
    }
  }
  expect(response).toMatchObject(expected);
});
});

如何模拟mongodb进行单元测试graphql解析器

2 个答案: