Unit Testing with Javascript Training in Copenhagen, Denmark

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.

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.