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nodejs-integration-tests-best-practices | powerful testing technique for Node.js : Component tests | Runtime Evironment library

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nodejs-integration-tests-best-practices is a JavaScript library typically used in Server, Runtime Evironment, Nodejs, MongoDB, Boilerplate, Express.js, Jest applications. nodejs-integration-tests-best-practices has no bugs, it has no vulnerabilities and it has medium support. You can download it from GitHub.
✅ Master the art of the most powerful testing technique for Node.js: Component tests. Including super-comprehensive best practices list and an example app (November 2021)
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  • It has 1892 star(s) with 94 fork(s). There are 21 watchers for this library.
  • It had no major release in the last 12 months.
  • There are 38 open issues and 37 have been closed. On average issues are closed in 68 days. There are 7 open pull requests and 0 closed requests.
  • It has a neutral sentiment in the developer community.
  • The latest version of nodejs-integration-tests-best-practices is 0.1
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nodejs-integration-tests-best-practices Key Features

✅ Master the art of the most powerful testing technique for Node.js: Component tests. Including super-comprehensive best practices list and an example app (November 2021)

⚪️ 1. Use Docker-Compose to host the database and other infrastructure

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# docker-compose.yml
version: '3.6'
services:
  database:
    image: postgres:11
    command: postgres -c fsync=off -c synchronous_commit=off -c full_page_writes=off -c random_page_cost=1.0
    environment:
      - POSTGRES_USER=myuser
      - POSTGRES_PASSWORD=myuserpassword
      - POSTGRES_DB=shop
    container_name: 'postgres-for-testing'
    ports:
      - '54310:5432'
    tmpfs: /var/lib/postgresql/data

⚪️ 2. Start docker-compose using code in the global setup process

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  // jest.config.js
  globalSetup: './example-application/test/global-setup.js'

⚪️ 3. Shutoff the infrastructure only in the CI environment

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  // jest.config.js
  globalTeardown: './example-application/test/global-teardown.js',

⚪️ 4. Optimize your real DB for testing, Don't fake it

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# docker-compose file
version: "3.6"
services:
  db:
    image: postgres:13
    container_name: 'postgres-for-testing'
    // fsync=off means don't wait for disc acknowledgement
    command: postgres -c fsync=off -c synchronous_commit=off -c full_page_writes=off -c random_page_cost=1.0
    tmpfs: /var/lib/postgresql/data
    # ...

⚪️ 5. Store test data in RAM folder

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# docker-compose file
version: "3.6"
services:
  db:
    image: postgres:13
    container_name: 'postgres-for-testing'
    // 👇 Stores the DB data in RAM folder. Works only in Linux
    tmpfs: /var/lib/postgresql/data
    # ...

⚪️ 6. Build the DB schema using migrations, ensure it happens only once in dev

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// jest.config.js
globalSetup: './example-application/test/global-setup.js'

// global-setup.js
const npm = require('npm');
const util = require('util');
module.exports = async () => {
  // ...
  const npmCommandAsPromise = util.promisify(npm.commands.run);
  await npmCommandAsPromise(['db:migrate']); // Migrating the DB using a npm script before running any tests.
  // ...
}

⚪️ 1. The test and the backend should live within the same process

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const apiUnderTest = require('../api/start.js');

beforeAll(async (done) => {
  //Start the backend in the same process

⚪️ 2. Let the tests control when the server should start and shutoff

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const initializeWebServer = async (customMiddleware) => {
  return new Promise((resolve, reject) => {
    // A typical Express setup
    expressApp = express();
    defineRoutes(expressApp);
    connection = expressApp.listen(() => {
      resolve(expressApp);
    });
  });
};

const stopWebServer = async () => {
  return new Promise((resolve, reject) => {
    connection.close(() => {
      resolve();
    })
  });
};

beforeAll(async (done) => {
  expressApp = await initializeWebServer();
  done();
});

afterAll(async (done) => {
  await stopWebServer();
  done();
});


⚪️ 3. Specify a port in production, randomize in testing

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// api-under-test.js
const initializeWebServer = async (customMiddleware) => {
  return new Promise((resolve, reject) => {
    // A typical Express setup
    expressApp = express();
    connection = expressApp.listen(webServerPort, () => {// No port
      resolve(expressApp);
    });
  });
};

// test.js
beforeAll(async (done) => {
  expressApp = await initializeWebServer();// No port
});

⚪️ 1. Stick to unit testing best practices, aim for great developer-experience

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// basic-tests.test.ts
test('When asked for an existing order, Then should retrieve it and receive 200 response', async () => {
  // Arrange
  const orderToAdd = {
    userId: 1,
    productId: 2,
    mode: 'approved',
  };
  const {
    data: { id: addedOrderId },
  } = await axiosAPIClient.post(`/order`, orderToAdd);

  // Act
  const getResponse = await axiosAPIClient.get(`/order/${addedOrderId}`);

  // Assert
  expect(getResponse).toMatchObject({
    status: 200,
    data: {
      userId: 1,
      productId: 2,
      mode: 'approved',
    },
  });
});

⚪️ 2. Approach the API using a library that is a pure HTTP client (e.g. axios, not supertest)

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// basic-test.test.ts
const axios = require('axios');
let axiosAPIClient;

beforeAll(async (done) => {
  const apiConnection = await initializeWebServer();
  const axiosConfig = {
    baseURL: `http://127.0.0.1:${apiConnection.port}`,
    validateStatus: () => true,
  };
  // Create axios client for the whole test suite
  axiosAPIClient = axios.create(axiosConfig);
  // ...
});

test('When asked for an existing order, Then should retrieve it and receive 200 response', async () => {
  const orderToAdd = {
    userId: 1,
    productId: 2,
    mode: 'approved',
  };

  // Use axios to create an order
  const {
    data: { id: addedOrderId },
  } = await axiosAPIClient.post(`/order`, orderToAdd);

  // Use axios to retrieve the same order by id
  const getResponse = await axiosAPIClient.get(`/order/${addedOrderId}`);
  // ...
});

⚪️ 3. Provide real credentials or token. If possible, avoid security back doors

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// Code example with signing JWT token

⚪️ 4. Assert on the entire HTTP response object, not on every field

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// basic-tests.test.ts
test('When asked for an existing order, Then should retrieve it and receive 200 response', async () => {
  // ...
  const getResponse = await axiosAPIClient.get(`/order/${addedOrderId}`);

  // Assert on entire HTTP response object
  expect(getResponse).toMatchObject({
    status: 200,
    data: {
      userId: 1,
      productId: 2,
      mode: 'approved',
    },
  });
});

⚪️ 5. Structure tests by routes and stories

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// basic-tests.test.js
describe('/api', () => {
  describe('GET /order', () => {
    // ...
  });

  describe('POST /orders', () => {
    // ...
  });
});

⚪️ 1. Isolate the component from the world using HTTP interceptor

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// Intercept requests for 3rd party APIs and return a predefined response 
beforeEach(() => {
  nock('http://localhost/user/').get(`/1`).reply(200, {
    id: 1,
    name: 'John',
  });
});

⚪️ 2. Define default responses before every test to ensure a clean slate

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// Create a one-time interceptor before every test
beforeEach(() => {
  nock('http://localhost/user/').get(`/1`).reply(200, {
    id: 1,
    name: 'John',
  });
});

// Endure clean slate after each test
afterEach(() => {
  nock.cleanAll();
});

⚪️ 3. Override the happy defaults with corner cases using unique paths

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// Using an uncommon user id (7) and create a compatible interceptor
test('When the user does not exist, return http 404', async () => {
  //Arrange
  const orderToAdd = {
    userId: 7,
    productId: 2,
    mode: 'draft',
  };

  nock('http://localhost/user/').get(`/7`).reply(404, {
    message: 'User does not exist',
    code: 'nonExisting',
  });

  //Act
  const orderAddResult = await axiosAPIClient.post('/order', orderToAdd);

  //Assert
  expect(orderAddResult.status).toBe(404);
});

⚪️ 4. Deny all outgoing requests by default

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beforeAll(async (done) => {
  // ...
  // ️️️Ensure that this component is isolated by preventing unknown calls
  nock.disableNetConnect();
  // Enable only requests for the API under test
  nock.enableNetConnect('127.0.0.1');

  done();
});

⚪️ 5. Simulate network chaos

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test('When users service replies with 503 once and retry mechanism is applied, then an order is added successfully', async () => {
  //Arrange
  nock.removeInterceptor(userServiceNock.interceptors[0])
  nock('http://localhost/user/')
    .get('/1')
    .reply(503, undefined, { 'Retry-After': 100 });
  nock('http://localhost/user/')
    .get('/1')
    .reply(200);
  const orderToAdd = {
    userId: 1,
    productId: 2,
    mode: 'approved',
  };

  //Act
  const response = await axiosAPIClient.post('/order', orderToAdd);

  //Assert
  expect(response.status).toBe(200);
});

⚪️ 6. Catch invalid outgoing requests by specifying the request schema

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// ️️️Assert that the app called the mailer service appropriately with the right input
test('When order failed, send mail to admin', async () => {
  //Arrange
  // ...
  let emailPayload;
  nock('http://mailer.com')
    .post('/send', (payload) => ((emailPayload = payload), true))
    .reply(202);
  const orderToAdd = {
    userId: 1,
    productId: 2,
    mode: 'approved',
  };

  //Act
  await axiosAPIClient.post('/order', orderToAdd);

  // ️️️Assert
  expect(emailPayload).toMatchObject({
    subject: expect.any(String),
    body: expect.any(String),
    recipientAddress: expect.stringMatching(
      /^[\w-\.]+@([\w-]+\.)+[\w-]{2,4}$/
    ),
  });
});

⚪️ 7. Record real outgoing requests for awareness

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// TODO

⚪️ 8. Fake the time to minimize network call duration

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// use "fake timers" to simulate long requests.
test("When users service doesn't reply within 2 seconds, return 503", async () => {
  //Arrange
  const clock = sinon.useFakeTimers();
  nock('http://localhost/user/')
    .get('/1', () => clock.tick(5000))
    .reply(200);

  const orderToAdd = {
    userId: 1,
    productId: 2,
    mode: 'approved',
  };

  //Act
  const response = await axiosAPIClient.post('/order', orderToAdd);

  //Assert
  expect(response.status).toBe(503);

  //Clean
  clock.uninstall();
});

⚪️ 1. Important: Each test should act on its own records only

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test('When asked for an existing order, Then should retrieve it and receive 200 response', async () => {
    //Arrange - Create a record so we can later query for it and assert for is existence
    const orderToAdd = {
        userId: 1,
        productId: 2,
        mode: 'approved',
    };
    await axiosAPIClient.post(`/order`, orderToAdd);

    //Next -> Invoke the route under test and asssert for something
});

⚪️ 2. Only metadata and context data should get pre-seeded to the database

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// Adding metadata globally. Done once regardless of the amount of tests
module.exports = async () => {
  console.time('global-setup');
  // ...
  await npmCommandAsPromise(['db:seed']); // Will create a countries (metadata) list. This is not related to the tests subject
  // ...
  // 👍🏼 We're ready
  console.timeEnd('global-setup');
};

⚪️ 3. Assert the new data state using the public API

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test('When adding a new valid order, Then should be able to retrieve it', async () => {
  //Arrange
  const orderToAdd = {
    userId: 1,
    productId: 2,
    mode: 'approved',
  };

  //Act
  const {
    data: { id: addedOrderId },
  } = await axiosAPIClient.post('/order', orderToAdd);

  //Assert by fetch the new order, and not only by the POST response
  const { data, status } = await axiosAPIClient.get(
    `/order/${addedOrderId}`
  );

  expect({
    data,
    status,
  }).toMatchObject({
    status: 200,
    data: {
      id: addedOrderId,
      userId: 1,
      productId: 2,
    },
  });
});

⚪️ 4. Important: Choose a clear data clean-up strategy: After-all (recommended) or after-each

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// After-all clean up (recommended)
// global-teardown.js
module.exports = async () => {
  // ...
  if (Math.ceil(Math.random() * 10) === 10) {
    await new OrderRepository().cleanup();
  }
};

⚪️ 5. Add some randomness to unique fields

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// Adding a short unique suffix to the externalIdentifier enable the writer to ignore other tests
// and the need to clean the db after each test
test('When adding a new valid order, Then should get back 200 response', async () => {
  //Arrange
  const orderToAdd = {
    userId: 1,
    productId: 2,
    mode: 'approved',
    externalIdentifier: `id-${getShortUnique()}`, //unique value
  };

  //Act
  const receivedAPIResponse = await axiosAPIClient.post(
    '/order',
    orderToAdd
  );
  // ...
});

⚪️ 6. Test also the response schema. Mostly when there are auto-generated fields

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test('When adding a new valid order, Then should get back approval with 200 response', async () => {
  // ...
  //Assert
  expect(receivedAPIResponse).toMatchObject({
    status: 200,
    data: {
      id: expect.any(Number), // Any number satisfies this test
      mode: 'approved',
    },
  });
});

⚪️ 7. Install the DB schema using the same technique like production

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// Create the DB schema. Done once regardless of the amount of tests
module.exports = async () => {
  console.time('global-setup');
  // ...
  await npmCommandAsPromise(['db:migrate']);
  // ...
  // 👍🏼 We're ready
  console.timeEnd('global-setup');

⚪️ 8. Test for undesired side effects

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test("When deleting an existing order, Then should get a successful message", async () => {
  // Arrange
  const orderToDelete = {
    userId: 1,
    productId: 2,
    externalIdentifier: `id-${getShortUnique()}`, //unique value
  };
  const {
    data: { id: orderToDeleteId },
  } = await axiosAPIClient.post("/order", orderToDelete);

  // Create another order to make sure the delete request deletes only the correct record
  const anotherOrder = {
    userId: 1,
    productId: 2,
    externalIdentifier: `id-${getShortUnique()}`, //unique value
  };

  nock("http://localhost/user/").get(`/1`).reply(200, {
    id: 1,
    name: "John",
  });
  const {
    data: { id: anotherOrderId },
  } = await axiosAPIClient.post("/order", anotherOrder);

  // Act
  const deleteResponse = await axiosAPIClient.delete(`/order/${orderToDeleteId}`);
  const getOrderResponse = await axiosAPIClient.get(`/order/${anotherOrderId}`);

  // Assert
  expect(deleteResponse.status).toBe(204);
  // Assert anotherOrder still exists
  expect(getOrderResponse.status).toBe(200);
});

⚪️ 1. Important: Use a fake MQ for the majority of testing

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// fake-mq.js, Simplistic implementation of MQ client for testing purposes
// Note: This is code is even more simplified, see full example in the example application
class FakeMessageQueueProvider extends EventEmitter {
  async ack() {
    this.emit('message-acknowledged', { event: 'message-acknowledged' }); //Let the test know that this happened
  }

  async sendToQueue(queueName, message) {
    this.emit('message-sent', message);
  }

  async consume(queueName, messageHandler) {
    // We just save the callback (handler) locally, whenever a message will put into this queue
    // we will fire this handler
    this.messageHandler = messageHandler;
  }

  async pushMessageToQueue(queue, newMessage) {
    this.messageHandler(newMessage);
  }
}

⚪️ 2. Promisify the test. Avoid polling, indentation, and callbacks

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// message-queue-client.js. The MQ client/wrapper is throwing an event when the message handler is done
async consume(queueName, onMessageCallback) {
  await this.channel.consume(queueName, async (theNewMessage) => {
    await onMessageCallback(theNewMessage);
    await this.ack(theNewMessage); // Handling is done, acknowledge the msg
    this.emit('message-acknowledged', eventDescription); // Let the tests know that all is over
  });
}

⚪️ 3. Test message acknowledgment and 'nack-cknowledgment'

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//Putting a delete-order message, checking the the app processed this correctly AND acknowledged
test('Whenever a user deletion message arrive, then his orders are deleted', async  ()  => {

  // Arrange
  // Add here a test record - A new order  of a specific user using the API
  
  const  fakeMessageQueue = await  startFakeMessageQueue();
  const  getNextMQEvent =  getNextMQConfirmation(fakeMessageQueue);
  
  // Act
  fakeMessageQueue.pushMessageToQueue('deleted-user', { id:  addedOrderId });
  
  // Assert
  const  eventFromMessageQueue = await  getNextMQEvent;
  // Check here that the user's orders were deleted
  expect(eventFromMessageQueue).toEqual([{ event:  'message-acknowledged' }]);
});

⚪️ 4. Test processing of messages batch

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# docker-compose file
version: "3.6"
services:
  db:
    image: postgres:11
    command: postgres
    environment:
      - POSTGRES_USER=myuser
      - POSTGRES_PASSWORD=myuserpassword
      - POSTGRES_DB=shop
    ports:
      - "5432:5432"

⚪️ 5. Test for 'poisoned' messages

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# docker-compose file
version: "3.6"
services:
  db:
    image: postgres:11
    command: postgres
    environment:
      - POSTGRES_USER=myuser
      - POSTGRES_PASSWORD=myuserpassword
      - POSTGRES_DB=shop
    ports:
      - "5432:5432"

⚪️ 6. Test for idempotency

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# docker-compose file
version: "3.6"
services:
  db:
    image: postgres:11
    command: postgres
    environment:
      - POSTGRES_USER=myuser
      - POSTGRES_PASSWORD=myuserpassword
      - POSTGRES_DB=shop
    ports:
      - "5432:5432"

⚪️ 7. Avoid a zombie process by testing connection failures

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# docker-compose file
version: "3.6"
services:
  db:
    image: postgres:11
    command: postgres
    environment:
      - POSTGRES_USER=myuser
      - POSTGRES_PASSWORD=myuserpassword
      - POSTGRES_DB=shop
    ports:
      - "5432:5432"

⚪️ 8. top of development testing, write a few E2E tests

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# docker-compose file
version: "3.6"
services:
  db:
    image: postgres:11
    command: postgres
    environment:
      - POSTGRES_USER=myuser
      - POSTGRES_PASSWORD=myuserpassword
      - POSTGRES_DB=shop
    ports:
      - "5432:5432"

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QUESTION

environment variables not working in node js server

Asked 2022-Feb-17 at 12:18

When i set my username and password directly in a nodemailer server, it works as expected

auth: {
    user: 'myusername',
    pass: 'mypassword'
},

But on using dotenv, nothing happens

require ('dotenv').config();

auth: {
  user: process.env.USERNAME,
  pass: process.env.PASSWORD
},

I ran npm install dotenv on server side and set up a .env file with the variables below:

USERNAME:myusername

PASSWORD:mypassword

ANSWER

Answered 2021-Dec-31 at 07:29

The syntax in your .env file is incorrect. Use equals = signs rather than colon :.

USERNAME=myusername
PASSWORD=mypassword

Source https://stackoverflow.com/questions/70539943

Community Discussions, Code Snippets contain sources that include Stack Exchange Network

Vulnerabilities

No vulnerabilities reported

Install nodejs-integration-tests-best-practices

:white_check_mark: Do: While there are various way to create the DB tables, always prefer the technique that is used in production - probably migrations. By doing so, another layer of bugs are covered: Should there be an issue with the DB schema - It will get caught during testing. Performance is always a critical concern, without thoughtful setup every tests execution will start with the migration framework approaching the DB to check if updates are needed. Alternatively, run the migrations only if a specific environment flag was passed. This will result in tests failing when the DB should get updated, developers must manually run npm script for migration but will maximize the tests start time. Note that migration is the right tool for building the schema and potentially also some metadata - But not the tests data itself (See bullet: Each tests must act on its own data). 👀   Alternatives: Most ORMs provide a 'sync' method that build the DB by the code model - This technique is not recommended for production and using it only for testing will bypass issues that exist in the production technique (e.g. migrations) ❌; Some migration frameworks (e.g. umzug which is also used by Sequelize) allow checking for newer version by looking at local files which is way faster, this is a viable option but not applicable in many ORMs ✅; You may store locally the last migration check and execute the migration command only if the migration folder changed since then ✅;. Section 2: Web server setup.
:white_check_mark: Do: In testing, use the same mechanism and code that installs the DB tables in production. Typically this will be a migration command (i.e., ORM) or .sql files invoked by a bash command. In principle, any production element that can be copied to testing is a blessing - It covers another layer of bugs. Should you mistakenly re-ceate an existing table or rename a non-existing column, this glitch will get caught during coding long before deployment. A recommended place to invoke the installation is within the global test setup - This way, there is no way to run the tests without its pre-requisites (see more in the section 'Infrastructure Setup'). 👀   Alternatives: Manually copy a DB dump - This is a great way to find installation issues only in production and also complicate the developer testing experience ❌   Automate a custom testing installation command (e.g., Docker with pre-defined tables, custom code) - Same caveats like previous paragraph ❌ .

Support

For any new features, suggestions and bugs create an issue on GitHub. If you have any questions check and ask questions on community page Stack Overflow .

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