Edward Jackson

Edward Jackson


Unit vs E2E Testing for Vue.js

In this article, you’ll see Unit vs E2E Testing for Vue.js. What’s the difference? Do you need both?

Writing tests when developing Vue.js apps can save you a lot of time which would be otherwise spent fixing bugs. The bigger and more complex your app gets, the truer this becomes.

There are two types of tests that are commonly performed for web applications: unit tests and end-to-end (E2E) tests.

What’s the difference? Do you need both?

Let’s explore.

Unit tests

The idea of a “unit” in testing, is to break down the code into small, easily testable parts. Usually, the unit is a single function, but can also be a class or even a complex algorithm.

A crucial concept of unit testing is that a given input of the function should always result in the same output.

For example, if we had a function that added two numbers called add we could write a unit test to ensure that a particular pair of numbers we provided as arguments would always return the output we expect.


// Function we want to test
const add = (x, y) => x + y;

// Unit test
test("should add two numbers", () => {
  const result = add(2, 3);

Any time we run that test and it doesn’t equal 5, we can conclude a bug has entered our code.

Component tests

In most Vue.js applications functions don’t really represent the atomic makeup of the app. Sure, we can unit test our methods, but what we also really care about is the HTML that’s generated.

For this reason, the unit in a Vue.js app test is a component rather than a function.

How do we test components? Let’s take this one as an example:


export default {
  template: `<div>Hello, {{ name }}</div>`,
  props: ['name']

As previously stated, a unit test must, for a given input (in this case, a prop), return a consistent output (in this case, text content).

Using a library like Vue Test Utils, we can mount a Vue component in memory and create a “wrapper” object. We can then query the wrapper to make assertions about the rendered HTML.


import displayGreeting from "./displayGreeting.js";

test("displays message", () => {
  const name = "Michael";
  const wrapper = mount(displayGreeting, { propsData: { name } });
  expect(wrapper.text()).toBe(`Hello, ${name}`);

Snapshot tests

In the above example, we used the wrapper.text() to query for the text in the component output.

In most components, though, testing the veracity of the output will require more than one snippet of text. We often want to ensure that a variety of elements are present.

Maybe it’d be easier to test the entire HTML output of the component?

Another kind of component unit test is a snapshot test where you do exactly that.

How it works is that you generate the output of the component once and write it to a text file. For example:


exports[`renders correctly 1`] = `<div>Hello, Michael</div>`;

Now, any time the tests run, if the rendered output of the component differs from what’s in the file, the test will fail.

Snapshots are a blunt instrument, but they are good for testing components which display a lot of HTML.

E2E tests

E2E (end-to-end) testing is a type of functional test. Unlike a unit test, you’re not breaking the application down into smaller parts in order to test it - you’re testing the entire application.

E2E tests interact with your app just like a real user would. For example, you may write an E2E test which:

  1. Loads your site
  2. Clicks on the “Sign up” link
  3. Provides some valid details to the inputs in the registration form
  4. Click the “Register button”.

This test should pass if an authentication token has been stored in the cookies and the app redirected to the profile page.


E2E tests are made on top of a browser automation driver like Selenium that provides an API to drive the browser.

An E2E testing framework like Cypress or Nightwatch will then provide a way for you to script your E2E tests for the browser automation driver.

The following code is what you might use in Nightwatch to perform the test described in the section above. You can probably tell what it does even if you’ve never used Nightwatch.


"register user": browser => {

  // Navigate to register page
    .waitForElementPresent(form.selector, 5000);

  // Fill out the form
    .setValue("@nameInput", "Anthony")
    .setValue("@emailInput", "anthony@test.com")
    .setValue("@passwordInput", "test1234")

  // Make assertions
    .getCookie(name, (result) => {
      this.assert.equals(result.name, 'auth');


Unit and E2E comparison

Unit pros:

  • Tests run fast
  • Test are precise and allow you to identify exact problems

Unit cons:

  • Tests run fast
  • Test are precise and allow you to identify exact problems

E2E pros:

  • Tests run fast
  • Test are precise and allow you to identify exact problems

E2E cons:

  • Tests run fast
  • Test are precise and allow you to identify exact problems


In my opinion, a combination of both unit and E2E tests is the best approach. The cons of one type can be mostly nullified by the pros of the other.

For example, E2E test won’t tell you the root cause of failure, but unit tests will, while unit tests won’t tell you if the whole application is working or not, while E2E tests will.

Using these test types together will give you a lot of confidence in your application, allowing you to add features or refactor without fear of collapse.

The general strategy for combining unit and E2E tests for a Vue.js app is this:

  • Tests run fast
  • Test are precise and allow you to identify exact problems

Bonus: testing tools

So you’re ready to start testing, what tool can you use?

For frontend unit testing, the best tool right now is Jest. It has many useful features, for example, allowing you to compile TypeScript and modern JS before the tests run.

You can use Jest in conjunction with Vue Test Utils which allows you to mount and query Vue components.

For E2E, the state-of-the-art tool right now is Cypress. Another more basic tool that also works well is Nightwatch.

The good news is that it’s easy to add all of these tools to a Vue application with Vue CLI 3.

Finally, it’s a good idea to use a continuous integration tool like Travis or Circle CI that will run your tests in the cloud (especially good for time-consuming E2E tests) and deploy your code conditional on all your tests passing.

Happy testing!

#vue-js #javascript #testing

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Unit vs E2E Testing for Vue.js
Aria Barnes

Aria Barnes


Why is Vue JS the most Preferred Choice for Responsive Web Application Development?

For more than two decades, JavaScript has facilitated businesses to develop responsive web applications for their customers. Used both client and server-side, JavaScript enables you to bring dynamics to pages through expanded functionality and real-time modifications.

Did you know!

According to a web development survey 2020, JavaScript is the most used language for the 8th year, with 67.7% of people choosing it. With this came up several javascript frameworks for frontend, backend development, or even testing.

And one such framework is Vue.Js. It is used to build simple projects and can also be advanced to create sophisticated apps using state-of-the-art tools. Beyond that, some other solid reasons give Vuejs a thumbs up for responsive web application development.

Want to know them? Then follow this blog until the end. Through this article, I will describe all the reasons and benefits of Vue js development. So, stay tuned.

Vue.Js - A Brief Introduction

Released in the year 2014 for public use, Vue.Js is an open-source JavaScript framework used to create UIs and single-page applications. It has over 77.4 million likes on Github for creating intuitive web interfaces.

The recent version is Vue.js 2.6, and is the second most preferred framework according to Stack Overflow Developer Survey 2019.

Every Vue.js development company is widely using the framework across the world for responsive web application development. It is centered around the view layer, provides a lot of functionality for the view layer, and builds single-page web applications.

Some most astonishing stats about Vue.Js:

• Vue was ranked #2 in the Front End JavaScript Framework rankings in the State of JS 2019 survey by developers.

• Approximately 427k to 693k sites are built with Vue js, according to Wappalyzer and BuiltWith statistics of June 2020.

• According to the State of JS 2019 survey, 40.5% of JavaScript developers are currently using Vue, while 34.5% have shown keen interest in using it in the future.

• In Stack Overflow's Developer Survey 2020, Vue was ranked the 3rd most popular front-end JavaScript framework.

Why is Vue.Js so popular?

• High-speed run-time performance
• Vue.Js uses a virtual DOM.
• The main focus is on the core library, while the collaborating libraries handle other features such as global state management and routing.
• Vue.JS provides responsive visual components.

Top 7 Reasons to Choose Vue JS for Web Application Development

Vue js development has certain benefits, which will encourage you to use it in your projects. For example, Vue.js is similar to Angular and React in many aspects, and it continues to enjoy increasing popularity compared to other frameworks.

The framework is only 20 kilobytes in size, making it easy for you to download files instantly. Vue.js easily beats other frameworks when it comes to loading times and usage.

Take a look at the compelling advantages of using Vue.Js for web app development.

#1 Simple Integration

Vue.Js is popular because it allows you to integrate Vue.js into other frameworks such as React, enabling you to customize the project as per your needs and requirements.

It helps you build apps with Vue.js from scratch and introduce Vue.js elements into their existing apps. Due to its ease of integration, Vue.js is becoming a popular choice for web development as it can be used with various existing web applications.

You can feel free to include Vue.js CDN and start using it. Most third-party Vue components and libraries are additionally accessible and supported with the Vue.js CDN.

You don't need to set up node and npm to start using Vue.js. This implies that it helps develop new web applications, just like modifying previous applications.

The diversity of components allows you to create different types of web applications and replace existing frameworks. In addition, you can also choose to hire Vue js developers to use the technology to experiment with many other JavaScript applications.

#2 Easy to Understand

One of the main reasons for the growing popularity of Vue.Js is that the framework is straightforward to understand for individuals. This means that you can easily add Vue.Js to your web projects.

Also, Vue.Js has a well-defined architecture for storing your data with life-cycle and custom methods. Vue.Js also provides additional features such as watchers, directives, and computed properties, making it extremely easy to build modern apps and web applications with ease.

Another significant advantage of using the Vue.Js framework is that it makes it easy to build small and large-scale web applications in the shortest amount of time.

#3 Well-defined Ecosystem

The VueJS ecosystem is vibrant and well-defined, allowing Vue.Js development company to switch users to VueJS over other frameworks for web app development.

Without spending hours, you can easily find solutions to your problems. Furthermore, VueJs lets you choose only the building blocks you need.

Although the main focus of Vue is the view layer, with the help of Vue Router, Vue Test Utils, Vuex, and Vue CLI, you can find solutions and recommendations for frequently occurring problems.

The problems fall into these categories, and hence it becomes easy for programmers to get started with coding right away and not waste time figuring out how to use these tools.

The Vue ecosystem is easy to customize and scales between a library and a framework. Compared to other frameworks, its development speed is excellent, and it can also integrate different projects. This is the reason why most website development companies also prefer the Vue.Js ecosystem over others.

#4 Flexibility

Another benefit of going with Vue.Js for web app development needs is flexibility. Vue.Js provides an excellent level of flexibility. And makes it easier for web app development companies to write their templates in HTML, JavaScript, or pure JavaScript using virtual nodes.

Another significant benefit of using Vue.Js is that it makes it easier for developers to work with tools like templating engines, CSS preprocessors, and type checking tools like TypeScript.

#5 Two-Way Communication

Vue.Js is an excellent option for you because it encourages two-way communication. This has become possible with the MVVM architecture to handle HTML blocks. In this way, Vue.Js is very similar to Angular.Js, making it easier to handle HTML blocks as well.

With Vue.Js, two-way data binding is straightforward. This means that any changes made by the developer to the UI are passed to the data, and the changes made to the data are reflected in the UI.

This is also one reason why Vue.Js is also known as reactive because it can react to changes made to the data. This sets it apart from other libraries such as React.Js, which are designed to support only one-way communication.

#6 Detailed Documentation

One essential thing is well-defined documentation that helps you understand the required mechanism and build your application with ease. It shows all the options offered by the framework and related best practice examples.

Vue has excellent docs, and its API references are one of the best in the industry. They are well written, clear, and accessible in dealing with everything you need to know to build a Vue application.

Besides, the documentation at Vue.js is constantly improved and updated. It also includes a simple introductory guide and an excellent overview of the API. Perhaps, this is one of the most detailed documentation available for this type of language.

#7 Large Community Support

Support for the platform is impressive. In 2018, support continued to impress as every question was answered diligently. Over 6,200 problems were solved with an average resolution time of just six hours.

To support the community, there are frequent release cycles of updated information. Furthermore, the community continues to grow and develop with backend support from developers.

Wrapping Up

VueJS is an incredible choice for responsive web app development. Since it is lightweight and user-friendly, it builds a fast and integrated web application. The capabilities and potential of VueJS for web app development are extensive.

While Vuejs is simple to get started with, using it to build scalable web apps requires professionalism. Hence, you can approach a top Vue js development company in India to develop high-performing web apps.

Equipped with all the above features, it doesn't matter whether you want to build a small concept app or a full-fledged web app; Vue.Js is the most performant you can rely on.

Original source


#vue js development company #vue js development company in india #vue js development company india #vue js development services #vue js development #vue js development companies

sophia tondon

sophia tondon


Top 10 VueJS Development Companies To Know In 2021-22

Vue.js is one of the most used and popular frontend development, or you can say client-side development framework. It is mainly used to develop single-page applications for both web and mobile. Famous companies like GitLab, NASA, Monito, Adobe, Accenture are currently using VueJS.

Do You Know?

Around 3079 companies reportedly use Vue.js in their tech stacks.
At GitHub, VueJS got 180.9K GitHub stars, including 28.5K GitHub forks.
Observing the increasing usage of VueJS and its robust features, various industry verticals are preferring to develop the website and mobile app Frontend using VueJS, and due to this reason, businesses are focusing on hiring VueJS developers from the top Vue.js development companies.

But the major concern of the enterprises is how to find the top companies to avail leading VueJS development service? Let’s move further and know what can help you find the best VueJS companies.

Read More - https://www.valuecoders.com/blog/technology-and-apps/top-10-vuejs-development-companies/

#hire vue js developer #hire vue.js developers #hire vue.js developer, #hire vue.js developers, #vue js development company #vue.js development company

Luna  Mosciski

Luna Mosciski


8 Popular Websites That Use The Vue.JS Framework

In this article, we are going to list out the most popular websites using Vue JS as their frontend framework.

Vue JS is one of those elite progressive JavaScript frameworks that has huge demand in the web development industry. Many popular websites are developed using Vue in their frontend development because of its imperative features.

This framework was created by Evan You and still it is maintained by his private team members. Vue is of course an open-source framework which is based on MVVM concept (Model-view view-Model) and used extensively in building sublime user-interfaces and also considered a prime choice for developing single-page heavy applications.

Released in February 2014, Vue JS has gained 64,828 stars on Github, making it very popular in recent times.

Evan used Angular JS on many operations while working for Google and integrated many features in Vue to cover the flaws of Angular.

“I figured, what if I could just extract the part that I really liked about Angular and build something really lightweight." - Evan You

#vuejs #vue #vue-with-laravel #vue-top-story #vue-3 #build-vue-frontend #vue-in-laravel #vue.js

Top VueJS App Development Company in USA

AppClues Infotech is the best & most reliable VueJS App Development Company in USA that builds high-quality and top-notch mobile apps with advanced methodology. The company is focused on providing innovative & technology-oriented solutions as per your specific business needs.

The organization’s VueJS developers have high experience and we have the capability of handling small to big projects. Being one of the leading mobile app development company in USA we are using the latest programming languages and technologies for their clients.

Key Elements:

· Total year of experience - 8+

· Employees Strength - 120+

· Hourly Rate - $25 – $45 / hr

· Location - New York, USA

· Successfully launched projects - 450+

VueJS Development Services by AppClues Infotech

· Custom VueJS Development

· Portal Development Solutions

· Web Application Development

· VueJS Plugin Development

· VueJS Ecommerce Development

· SPA (Single Page App) Development

· VueJS Migration

Why Hire VueJS Developers from AppClues Infotech?

· Agile & Adaptive Development

· 8+ Years of Average Experience

· 100% Transparency

· Guaranteed Bug-free VueJS Solution

· Flexible Engagement Models

· On-Time Project Delivery

· Immediate Technical Support

If you have any project ideas for VueJS app development then share your requirements with AppClues Infotech to get the best solution for your dream projects.

For more info:
Share Yoru Requirements: https://www.appcluesinfotech.com/contact-us/
Email: info@appcluesinfotech.com
Call: +1-978-309-9910

#top vue.js development company #vue.js app development company #best vue js development company #hire top vue js developers #hire top vue.js developers in usa #vue js development company usa

A Secret Weapon for Vue Unit Tests

If your Vue single-file components have dependencies, you’ll need to handle the dependencies somehow when you unit test the component.

One approach is to install the dependencies in the test environment, but this may overcomplicate your tests.

In this article, I’ll show you how to mock a module file in Jest by replacing it in your component’s graph of dependencies.

#vue.js #jest #testing #unit testing #vue