Unit Testing with Javascript Training in London

Unit Testing with Javascript Training in London, United Kingdom

The course covers key concepts such as setting up testing environments, writing test cases, and using assertions to validate code behavior.

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Unit Testing with Javascript Training is a professional training program delivered by ProgNXT in London, United Kingdom. ProgNXT, a globally recognized corporate training provider in 55+ countries, offers this Unit Testing with Javascript Training course with hands-on, instructor-led sessions. Unit testing with JavaScript training teaches participants how to write effective and automated unit tests for JavaScript applications using popular...

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Designed and delivered by the ProgNXT Software Engineering Expert Panel — a vetted team of industry professionals with 18+ years of hands-on experience in system design, microservices architecture, Git, and SDLC practices

ProgNXT Software Engineering Expert Panel

Course Code: PRR40
14 Hrs
Last Updated: April 2026

Course Rating5/5

Unit testing with JavaScript training teaches participants how to write effective and automated unit tests for JavaScript applications using popular frameworks like Jest, Mocha, or Jasmine. The course covers key concepts such as setting up testing environments, writing test cases, and using assertions to validate code behavior. Participants learn how to mock dependencies, handle asynchronous code, and ensure that individual components of their JavaScript application work correctly in isolation. Hands-on exercises help participants practice organizing tests, debugging failing tests, and integrating testing into CI/CD pipelines. By the end of the training, attendees will be proficient in applying unit testing techniques to ensure the reliability and quality of their JavaScript code.

Basic knowledge of JavaScript programming language.
Familiarity with object-oriented programming concepts and functions.
No prior experience with unit testing is required.

Upon completion of this course, participants will:

Understand the core concepts of unit testing and its significance in JavaScript development.
Learn to write unit tests using popular JavaScript testing frameworks like Jest and Mocha.
Gain hands-on experience in mocking and spying on functions.
Understand how to test both synchronous and asynchronous JavaScript code.
Learn how to integrate unit testing into the development lifecycle.
Be able to write effective and maintainable tests for JavaScript applications.

Unit Testing with JavaScript: Ability to write and execute unit tests using Jest, Mocha, or other testing frameworks.
Test Framework Setup: Skill in setting up testing frameworks for JavaScript applications.
Mocking and Stubbing: Understanding how to mock dependencies and use spies to isolate code components during tests.
Testing Asynchronous Code: Proficiency in writing tests for asynchronous JavaScript code using promises, async/await, and callbacks.
Test-Driven Development (TDD): Ability to use TDD principles to write tests first and then implement the corresponding code.
Code Coverage and Quality: Knowledge of tools and techniques for measuring and improving test coverage.

Participants will be assessed on:

Writing Unit Tests: Ability to write unit tests for JavaScript functions and methods.
Test Framework Usage: Proficiency in using Jest, Mocha, or other popular JavaScript testing libraries.
Mocking and Spying: Ability to mock and spy on functions and objects to isolate test components.
Asynchronous Testing: Knowledge and application of testing asynchronous JavaScript code using promises and async/await.
Code Coverage and Refactoring: Understanding of how to measure test coverage and refactor code based on test results.

Certificate of Completion: Participants who attend all sessions and successfully complete the course assessments will receive a ProgNXT Certificate of Completion for Unit Testing with JavaScript Training.

Introduction to Unit Testing with JavaScript

Introduction to Unit Testing

What is unit testing and why is it important in JavaScript development?
Benefits of unit testing: improved code quality, early bug detection, and better maintainability.
Overview of unit testing frameworks: Jest, Mocha, Chai, and Jasmine.
Setting up a simple JavaScript testing project using Jest.
Hands-on Exercise

Understanding Test Cases and Assertions

Anatomy of a unit test: describe, it, expect, assertions.
Common assertions in JavaScript tests: expect().toBe(), expect().toEqual(), expect().toThrow(), etc.
Writing your first test case with assertions.
Hands-on Exercise

Mocking and Stubbing Functions

What is mocking, and why is it important for unit testing?
Introduction to mocking in Jest using jest.fn() and jest.spyOn().
Difference between mocking and stubbing.
Hands-on Exercise

Testing Synchronous Code

Writing tests for basic synchronous JavaScript functions.
Use cases for testing simple functions like mathematical operations, string manipulations, etc.
Hands-on Exercise

Summary and Q&A

Recap of key concepts learned.
Q&A session to address challenges and doubts faced during exercises.

Advanced Unit Testing Techniques with JavaScript

Testing Asynchronous JavaScript Code

How to test asynchronous code using Promises, async/await, and callbacks.
Techniques to handle asynchronous code in Jest and Mocha.
Testing asynchronous functions with done() callback, resolves, and rejects.
Hands-on Exercise

Test-Driven Development (TDD) in JavaScript

The concept of Test-Driven Development (TDD) and the Red-Green-Refactor cycle.
Benefits of TDD: ensuring code reliability and fostering good design practices.
Writing unit tests before code: practical examples using TDD.
Hands-on Exercise

Working with External Libraries and APIs

Mocking API calls using nock or jest-fetch-mock for unit testing.
Testing functions that interact with external services.
Hands-on Exercise

Advanced Mocking Techniques

Using spies to monitor function calls and arguments in tests.
Mocking entire modules using jest.mock() and mockImplementation().
Hands-on Exercise

Code Coverage and Test Reports

Introduction to code coverage tools: jest --coverage, Istanbul.
Measuring and improving code coverage in JavaScript projects.
Generating test reports and analyzing them to improve test effectiveness.
Hands-on Exercise

Best Practices for Unit Testing in JavaScript

Writing maintainable and effective tests: keeping tests isolated and focused.
Organizing tests: structuring tests to reflect the application's architecture.
Naming conventions and documenting tests.
Hands-on Exercise

Course Summary and Q&A

Recap of all concepts learned during the course.
Final Q&A session to address any lingering questions.
Closing remarks and feedback on the course.

JavaScript testing framework setup guides (Jest, Mocha).
Sample JavaScript code for hands-on exercises.
Documentation for mocking libraries (jest.fn(), jest.spyOn(), nock).
Best practices for unit testing JavaScript applications.

Evaluation based on participation in practical exercises, the quality of unit tests written, and successful completion of the final project.
ProgNXT Certificate of Completion will be awarded to participants who successfully complete the course and assessments.

This Unit Testing with JavaScript Training will provide participants with the knowledge and hands-on experience necessary to write effective unit tests using Jest, Mocha, and other testing tools. Participants will learn to test both synchronous and asynchronous JavaScript code, mock dependencies, apply TDD principles, and integrate unit tests into their development process to ensure robust, reliable code.

Unit Testing with Javascript Training Events in london

Online Events

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More Upcoming Session Dates

October 2026

🌐 Online Instructor-Led

26th Oct 2026→27th Oct 2026

November 2026

📍 London, United Kingdom

1st Nov 2026→2nd Nov 2026

🌐 Online Instructor-Led

12th Nov 2026→13th Nov 2026

🌐 Online Instructor-Led

20th Nov 2026→21st Nov 2026

📍 London, United Kingdom

24th Nov 2026→25th Nov 2026

December 2026

🌐 Online Instructor-Led

9th Dec 2026→10th Dec 2026

📍 London, United Kingdom

10th Dec 2026→11th Dec 2026

🌐 Online Instructor-Led

21st Dec 2026→22nd Dec 2026

📍 London, United Kingdom

25th Dec 2026→26th Dec 2026

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Unit Testing with Javascript Training in London