Testing Application and Continuous Delivery Pipeline

Introduction

It is a best practice to test and create a continuous delivery pipeline when building an application. Using TypeScript and flow in JavaScript tends to reduce these errors, but a well-structured test guarantees the application will work as intended. A continuous delivery pipeline acts as a gatekeeper to ensure the application will not break when a new feature is introduced.

The Continuous Delivery Pipeline (CDP) represents the workflows, activities, and automation needed to shepherd a new piece of functionality from ideation to an on-demand release of value to the end-user.

Testing

We can select and configure unit testing and end-to-end testing when creating a project using Vue CLI.

vue create whatsapp-clone

// select unit testing and end-to-end testing
Vue CLI v5.0.8
? Please pick a preset: Manually select features
? Check the features needed for your project: (Press <space> to select, <a> to toggle all, <i> to invert selection, and <enter> to 
proceed)
 ◉ Babel
 ◯ TypeScript
 ◯ Progressive Web App (PWA) Support
 ◯ Router
 ◯ Vuex
 ◯ CSS Pre-processors
 ◉ Linter / Formatter
 ◉ Unit Testing
❯◉ E2E Testing

Once we have selected unit testing and end-to-end testing, Vue CLI will configure our application with unit testing and end-to-end testing.

Unit testing is a software testing method by which individual units of source code—sets of one or more computer program modules together with associated control data, usage procedures, and operating procedures—are tested to determine whether they are fit for use.

End-to-end testing is a technique that tests the entire software product from beginning to end to ensure the application flow behaves as expected.

Select the unit testing of your choice:

? Pick a unit testing solution: (Use arrow keys)
> Mocha + Chai
  Jest      

Select the end-to-end testing of your choice:

? Pick an E2E testing solution: (Use arrow keys)
> Cypress (Chrome only)
  Nightwatch (WebDriver-based)
  WebdriverIO (WebDriver/DevTools based) 

The concept of testing using any of the products provided by default is similar. The main objective of testing is to design the tests so that they systematically find different types of errors without taking much time and effort so that less time is required to develop the software.