mock-apollo-clientreturnig"回應不成功：收到狀態碼401"

我正在撰寫一個玩具應用程式來了解有關無服務器框架和 AWS AppSync 等的更多資訊。我正在嘗試盡可能多地進行 TDD。我mock-apollo-client用來模擬ApolloClient，我遇到了一個問題。當嘗試撰寫測驗以確保傳遞給查詢的引數時，測驗總是回傳 401 Unauthorized 錯誤。似乎仍在呼叫真正的端點，因為當將有效值x-api-key添加到 ApolloClient 的實體化時，測驗會從 AppSync 服務器回傳實際值，而不是我期望的模擬值。我使用的是模擬，而不是間諜，所以我不期望真正的終點會被真正擊中。此外，當我添加有效x-api-key時，測驗失敗，因為該函式從未被呼叫。

 api ? recipes ? Given a valid recipe id ? Should call query with the id as a param

    expect(jest.fn()).toBeCalledTimes(expected)

    Expected number of calls: 1
    Received number of calls: 0

我預計測驗會失敗，因為當前沒有使用任何引數呼叫查詢，而是因為從未呼叫過模擬函式而失敗。

我究竟做錯了什么？

代碼檔案

import { ApolloClient, gql, InMemoryCache } from '@apollo/client';

const client = new ApolloClient({
  uri: 'https://redacted.appsync-api.redacted.amazonaws.com/graphql',
  headers: {
    'x-api-key': 'key-redacted',
  },
  cache: new InMemoryCache(),
});

export const GET_RECIPE_QUERY = gql`
  query {
    getRecipe (title:"Lemon Cheese Cake") {
      title,
      ingredients{
        name,
        amount,
        unit
      },
      steps
    }
  }
`;

const gqlQuery = (title) => {

  return client
    .query({
      query: GET_RECIPE_QUERY,
      variables : { title }
    });
};

export const getRecipe = async (id) => {
  const result = await gqlQuery(id);

  return result.data.getRecipe;
};

測驗檔案

import { createMockClient } from 'mock-apollo-client';

import { GET_RECIPE_QUERY, getRecipe } from './recipes';

const mockRecipe = {
  title: 'Luke\'s Chocolate Orange',
  ingredients: [
    {
      name: 'Orange',
      amount: 1,
    },
    {
      name: 'Chocolate',
      amount: 250,
      unit: 'grams',
    },
  ],
  steps: [
    'Peel orange',
    'Open chocolate',
    'Eat chocolate',
    'Throw orange away',
  ],
};

const mockClient = createMockClient();
const queryHandler = jest.fn().mockResolvedValue({data: {recipe: mockRecipe}});

mockClient.setRequestHandler(GET_RECIPE_QUERY, queryHandler);

describe('api', () => {
  describe('recipes', () => {
    describe('Given a valid recipe id', () => {
      it('Should call query with the id as a param', async () => {
        const id = 'Luke\'s Chocolate Orange';
        const result = await getRecipe(id);
        
        expect(queryHandler).toBeCalledTimes(1);
        expect(queryHandler).toBeCalledWith(id);
      });
    });
  });
});

uj5u.com熱心網友回復：

mock-apollo-client總是使用 with ApolloProvider，這樣你就可以通過 React context Provider 將 mock apollo 客戶端傳遞給后代組件。

但是，您的代碼無法以這種方式將模擬 apollo 客戶端傳遞給組件。您的代碼直接從 Apollo 客戶端發起請求。我們需要攔截這些 GraphQL 請求。有幾種方法可以做到這一點，例如msw。但是，我將繼續使用該mock-apollo-client庫進行演示。

您需要模擬模塊ApolloClient的類。@apollo/client我們需要使用Mocking Partials，我們不想模擬從中匯出的其他東西@apollo/client。由于mock-apollo-client庫已經提供createMockClient了創建模擬 apollo 客戶端的功能，我們不需要自己模擬。

一個作業示例：

recipes.ts：

import { ApolloClient, gql, InMemoryCache } from '@apollo/client';

const client = new ApolloClient({
  uri: 'https://redacted.appsync-api.redacted.amazonaws.com/graphql',
  headers: {
    'x-api-key': 'key-redacted',
  },
  cache: new InMemoryCache(),
});

export const GET_RECIPE_QUERY = gql`
  query {
    getRecipe(title: "Lemon Cheese Cake") {
      title
      ingredients {
        name
        amount
        unit
      }
      steps
    }
  }
`;

const gqlQuery = (title) => {
  return client.query({
    query: GET_RECIPE_QUERY,
    variables: { title },
  });
};

export const getRecipe = async (id) => {
  const result = await gqlQuery(id);
  return result.data.getRecipe;
};

recipes.test.ts：

import { createMockClient } from 'mock-apollo-client';

const mockRecipe = {
  title: "Luke's Chocolate Orange",
  ingredients: [
    { name: 'Orange', amount: 1, unit: 'abc' },
    { name: 'Chocolate', amount: 250, unit: 'grams' },
  ],
  steps: ['Peel orange', 'Open chocolate', 'Eat chocolate', 'Throw orange away'],
};
const mockClient = createMockClient();

describe('api', () => {
  describe('recipes', () => {
    describe('Given a valid recipe id', () => {
      beforeEach(() => {
        jest.resetModules();
      });
      it('Should call query with the id as a param', async () => {
        jest.doMock('@apollo/client', () => {
          return {
            ...jest.requireActual('@apollo/client'),
            ApolloClient: jest.fn(() => mockClient),
          };
        });
        const queryHandler = jest.fn().mockResolvedValue({ data: { getRecipe: mockRecipe } });

        const { GET_RECIPE_QUERY, getRecipe } = require('./recipes');
        mockClient.setRequestHandler(GET_RECIPE_QUERY, queryHandler);

        const title = "Luke's Chocolate Orange";
        const result = await getRecipe(title);
        expect(result).toEqual(mockRecipe);
        expect(queryHandler).toBeCalledWith({ title });
      });
    });
  });
});

測驗結果：

 PASS  src/stackoverflow/71612556/recipes.test.ts
  api
    recipes
      Given a valid recipe id
        ? Should call query with the id as a param (91 ms)

------------------------|---------|----------|---------|---------|-------------------
File                    | % Stmts | % Branch | % Funcs | % Lines | Uncovered Line #s 
------------------------|---------|----------|---------|---------|-------------------
All files               |   90.91 |      100 |   66.67 |   90.91 |                   
 mocks                  |      75 |      100 |       0 |      75 |                   
  handlers.js           |   66.67 |      100 |       0 |   66.67 | 14                
  server.js             |     100 |      100 |     100 |     100 |                   
 stackoverflow/71612556 |     100 |      100 |     100 |     100 |                   
  recipes.ts            |     100 |      100 |     100 |     100 |                   
------------------------|---------|----------|---------|---------|-------------------
Test Suites: 1 passed, 1 total
Tests:       1 passed, 1 total
Snapshots:   0 total
Time:        2.775 s

你可以在這里找到源代碼

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