How to Integrate Jest and Puppeteer for End-to-End Testing

Learn how to integrate Jest and Puppeteer in your project for End-to-End Testing.

Writing a foolproof code is hard, especially with a team collaborating on a single project. Thus it becomes increasingly important to ensure that no new code breaks existing functionality. And for this purpose, automated tests are used.

Requirements

  1. Basic knowledge of Javascript
  2. Familiarity with Node.js

In this blog, we will learn how to integrate Jest and Puppeteer in our project for End-to-End Testing. [Jest] https://github.com/facebook/jest) is a javascript testing framework maintained by Facebook. Puppeteer is a Node library created by Google, which provides a high-level API to control headless Chrome. Before we delve deeper into Jest and Puppeteer, let’s familiarise ourselves with a few things.

End-to-End(E2E) Testing: E2E testing refers to the testing of a complete functionality of some application. It checks that a functionality acts as intended.

Headless Testing: Headless testing is a way or running browser UI tests without any browser UI. It is a preferred method mainly due to its performance. It is fast, light-weight, and less resource-intensive.

Installation

To install Jest and Puppeteer, open the command line in your project directory and run:

For npm users:

 npm install --save-dev jest puppeteer jest-puppeteer

For yarn users:

 yarn add --dev jest puppeteer jest-puppeteer.

Now that we’ve installed Jest and Puppeteer, it is time to set up the testing environment. Create a file jest.config.js in the project root directory and write the following code in it:

module.exports = {
  preset: "jest-puppeteer",
  globals: {
    URL: "http://localhost:8080"
  },
  testMatch: [
    "<path-to-the-tests-folder>/**.test.js"
  ],
  verbose: true
};

Defining the preset sets up a puppeteer environment for testing. Test match directs it to the folder where tests are defined, for a piece of more detailed knowledge about running Jest with Puppeteer check this out.

Now create a file jest-puppeteer.config.js in the project root directory. Here we define the testing environment further. To begin with you can add the following in this file:

module.exports = {
    launch: {
        headless: process.env.HEADLESS !== 'false',
        slowMo: process.env.SLOWMO ? process.env.SLOWMO : 0,
        devtools: true
    }
}

Testing

Now we can begin writing our tests. In this example, we’ll start writing a basic test to check the title of the page opened. Now head over to the tests folder defined and create a file title.test.js. As you might have noticed, .test.js would be the file extension of the jest tests defined.

This is what a typical title.test.js would look like:

// Defining the timeout for the test
const timeout = process.env.SLOWMO ? 6000 : 4000;
const fs = require('fs');

// Go to the specified path and wait for the domcontent to load before running the tests
beforeAll(async () => {
  path = fs.realpathSync('file://<file-path>');
  await page.goto('file://' + path, {waitUntil: 'domcontentloaded'});
});

describe('Title of the page', () => {
  test('Title of the page', async () => {
    // Gets page title
    const title = await page.title();
    // Compares it with the intended behaviour
    expect(title).toBe('<title-of-the-page>');

  }, timeout);
});

Hurray! You’ve added Headless UI tests to your project. Now you can similarly define tests for different functionalities using the docs here.

#testing #jest #puppeteer #javascript #node

What is GEEK

Buddha Community

How to Integrate Jest and Puppeteer for End-to-End Testing
Tamia  Walter

Tamia Walter

1596754901

Testing Microservices Applications

The shift towards microservices and modular applications makes testing more important and more challenging at the same time. You have to make sure that the microservices running in containers perform well and as intended, but you can no longer rely on conventional testing strategies to get the job done.

This is where new testing approaches are needed. Testing your microservices applications require the right approach, a suitable set of tools, and immense attention to details. This article will guide you through the process of testing your microservices and talk about the challenges you will have to overcome along the way. Let’s get started, shall we?

A Brave New World

Traditionally, testing a monolith application meant configuring a test environment and setting up all of the application components in a way that matched the production environment. It took time to set up the testing environment, and there were a lot of complexities around the process.

Testing also requires the application to run in full. It is not possible to test monolith apps on a per-component basis, mainly because there is usually a base code that ties everything together, and the app is designed to run as a complete app to work properly.

Microservices running in containers offer one particular advantage: universal compatibility. You don’t have to match the testing environment with the deployment architecture exactly, and you can get away with testing individual components rather than the full app in some situations.

Of course, you will have to embrace the new cloud-native approach across the pipeline. Rather than creating critical dependencies between microservices, you need to treat each one as a semi-independent module.

The only monolith or centralized portion of the application is the database, but this too is an easy challenge to overcome. As long as you have a persistent database running on your test environment, you can perform tests at any time.

Keep in mind that there are additional things to focus on when testing microservices.

  • Microservices rely on network communications to talk to each other, so network reliability and requirements must be part of the testing.
  • Automation and infrastructure elements are now added as codes, and you have to make sure that they also run properly when microservices are pushed through the pipeline
  • While containerization is universal, you still have to pay attention to specific dependencies and create a testing strategy that allows for those dependencies to be included

Test containers are the method of choice for many developers. Unlike monolith apps, which lets you use stubs and mocks for testing, microservices need to be tested in test containers. Many CI/CD pipelines actually integrate production microservices as part of the testing process.

Contract Testing as an Approach

As mentioned before, there are many ways to test microservices effectively, but the one approach that developers now use reliably is contract testing. Loosely coupled microservices can be tested in an effective and efficient way using contract testing, mainly because this testing approach focuses on contracts; in other words, it focuses on how components or microservices communicate with each other.

Syntax and semantics construct how components communicate with each other. By defining syntax and semantics in a standardized way and testing microservices based on their ability to generate the right message formats and meet behavioral expectations, you can rest assured knowing that the microservices will behave as intended when deployed.

Ways to Test Microservices

It is easy to fall into the trap of making testing microservices complicated, but there are ways to avoid this problem. Testing microservices doesn’t have to be complicated at all when you have the right strategy in place.

There are several ways to test microservices too, including:

  • Unit testing: Which allows developers to test microservices in a granular way. It doesn’t limit testing to individual microservices, but rather allows developers to take a more granular approach such as testing individual features or runtimes.
  • Integration testing: Which handles the testing of microservices in an interactive way. Microservices still need to work with each other when they are deployed, and integration testing is a key process in making sure that they do.
  • End-to-end testing: Which⁠—as the name suggests⁠—tests microservices as a complete app. This type of testing enables the testing of features, UI, communications, and other components that construct the app.

What’s important to note is the fact that these testing approaches allow for asynchronous testing. After all, asynchronous development is what makes developing microservices very appealing in the first place. By allowing for asynchronous testing, you can also make sure that components or microservices can be updated independently to one another.

#blog #microservices #testing #caylent #contract testing #end-to-end testing #hoverfly #integration testing #microservices #microservices architecture #pact #testing #unit testing #vagrant #vcr

Software Testing 101: Regression Tests, Unit Tests, Integration Tests

Automation and segregation can help you build better software
If you write automated tests and deliver them to the customer, he can make sure the software is working properly. And, at the end of the day, he paid for it.

Ok. We can segregate or separate the tests according to some criteria. For example, “white box” tests are used to measure the internal quality of the software, in addition to the expected results. They are very useful to know the percentage of lines of code executed, the cyclomatic complexity and several other software metrics. Unit tests are white box tests.

#testing #software testing #regression tests #unit tests #integration tests

How to Integrate Jest and Puppeteer for End-to-End Testing

Learn how to integrate Jest and Puppeteer in your project for End-to-End Testing.

Writing a foolproof code is hard, especially with a team collaborating on a single project. Thus it becomes increasingly important to ensure that no new code breaks existing functionality. And for this purpose, automated tests are used.

Requirements

  1. Basic knowledge of Javascript
  2. Familiarity with Node.js

In this blog, we will learn how to integrate Jest and Puppeteer in our project for End-to-End Testing. [Jest] https://github.com/facebook/jest) is a javascript testing framework maintained by Facebook. Puppeteer is a Node library created by Google, which provides a high-level API to control headless Chrome. Before we delve deeper into Jest and Puppeteer, let’s familiarise ourselves with a few things.

End-to-End(E2E) Testing: E2E testing refers to the testing of a complete functionality of some application. It checks that a functionality acts as intended.

Headless Testing: Headless testing is a way or running browser UI tests without any browser UI. It is a preferred method mainly due to its performance. It is fast, light-weight, and less resource-intensive.

Installation

To install Jest and Puppeteer, open the command line in your project directory and run:

For npm users:

 npm install --save-dev jest puppeteer jest-puppeteer

For yarn users:

 yarn add --dev jest puppeteer jest-puppeteer.

Now that we’ve installed Jest and Puppeteer, it is time to set up the testing environment. Create a file jest.config.js in the project root directory and write the following code in it:

module.exports = {
  preset: "jest-puppeteer",
  globals: {
    URL: "http://localhost:8080"
  },
  testMatch: [
    "<path-to-the-tests-folder>/**.test.js"
  ],
  verbose: true
};

Defining the preset sets up a puppeteer environment for testing. Test match directs it to the folder where tests are defined, for a piece of more detailed knowledge about running Jest with Puppeteer check this out.

Now create a file jest-puppeteer.config.js in the project root directory. Here we define the testing environment further. To begin with you can add the following in this file:

module.exports = {
    launch: {
        headless: process.env.HEADLESS !== 'false',
        slowMo: process.env.SLOWMO ? process.env.SLOWMO : 0,
        devtools: true
    }
}

Testing

Now we can begin writing our tests. In this example, we’ll start writing a basic test to check the title of the page opened. Now head over to the tests folder defined and create a file title.test.js. As you might have noticed, .test.js would be the file extension of the jest tests defined.

This is what a typical title.test.js would look like:

// Defining the timeout for the test
const timeout = process.env.SLOWMO ? 6000 : 4000;
const fs = require('fs');

// Go to the specified path and wait for the domcontent to load before running the tests
beforeAll(async () => {
  path = fs.realpathSync('file://<file-path>');
  await page.goto('file://' + path, {waitUntil: 'domcontentloaded'});
});

describe('Title of the page', () => {
  test('Title of the page', async () => {
    // Gets page title
    const title = await page.title();
    // Compares it with the intended behaviour
    expect(title).toBe('<title-of-the-page>');

  }, timeout);
});

Hurray! You’ve added Headless UI tests to your project. Now you can similarly define tests for different functionalities using the docs here.

#testing #jest #puppeteer #javascript #node

Rahul  Hickle

Rahul Hickle

1598457456

Is API Load Testing Right for Your App? - DZone Integration

API load testing has been around for decades. There are lots of robust tools you can choose from, both commercial and open-source, and many of these tools have large communities and extensive documentation around how to script the most common causes. It’s a far cry from the browser-level testing space, which is relatively new and sparsely populated by comparison.
API load testing is one of the most cost-efficient ways you can get started with load testing, allowing you to scale up your load relatively cheaply while getting immediate results.
How to Get Started With API Load Testing
API load testing isn’t for every application, but depending on your test scenario, it may be the easiest way to test applic.

#integration #performance testing #load testing #jmeter #puppeteer #api load testing #load testing difficulties

Aman Agrawal

1606280193

End-to-End Testing with Jest and Puppeteer

Writing a foolproof code is hard, especially with a team collaborating on a single project. Thus it becomes increasingly important to ensure that no new code breaks existing functionality. And for this purpose, automated tests are used.

Learn how to integrate Jest and Puppeteer in your project for End-to-End Testing.

https://www.loginradius.com/engineering/blog/e2e-testing-with-jest-puppeteer/

#testing #jest #puppeteer #engineering #developer #technology