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Hands On Workshop: The Art of Unit Testing & TDD in Modern JavaScript

with Roy Osherove

The Problem

Unit testing, done badly, can hurt your project more than it helps. In some cases, it may lead to project schedule delays, and unhappy developers due to huge maintenance problems. But when unit testing is done right, it can help the project and developers’ confidence immensely. The challenge is - how do you do it in a way that is helping, rather than hurting your project?

Objective

Specifically designed for the new age of modern JavaScript in 2020, In this coding-packed training workshop we will learn essential test driven skills and techniques for writing unit tests in a readable, maintainable and trustworthy fashion, so that we can feel more confident in our code,  make it simpler, and save ourselves time in debugging and maintaining our code base. we will also look at some code design issues that hurt testability.

  1. Learn how to write readable, maintainable, trustworthy unit tests using Javascript and node.js, 

  2. Learn how to refactor code, and SOLID design concepts.

  3. Learn the principles of Test Driven Development, and develop new features using TDD.

  4. Learn how to Pair Program, and experience it throughout the course

  5. Learn about mocks, stubs, spies & fakes, and the difference between them

  6. Learn about testing frameworks such as jest and Jasmine, and isolation (mocking) frameworks like sinon & jest mocks.

Pre-Requisites

  • The course will benefit both backend (node.js) developers and frontend (Angular, React, Vue etc..) developers with at least a year’s experience developing with JavaScript ES2015 syntax knowledge

  • No knowledge of typescript is required, but drills can be executed in typescript if you find it useful.

  • VS Code, IntelliJ, Webstorm or other JS enabled IDEs with JavaScript or Typescript enabled plugins

  • JS ES2015 syntax knowledge

Agenda

Day 1: Beginnings (09:00-16:00)

  1. Units, entry points & exit points.

  2. The first unit test & a continuous testing environment

  3. Jest basics & Drills

  4. Writing readable, maintainable tests

  5. Test Driven Development Introduction

  6. String Calculator,Password Verifier Kata Drills

  7. Value based,  State Based and Interaction Based Tests

  8. Drills

Day 2: Mocks & Stubs (09:00-16:00)

  1. Understanding Fakes, Spies Mocks and Stubs

  2. Hand Written Fakes, Stubs and Mocks

  3. Faking Time & Drills

  4. Faking other dependencies & Drills

  5. Jest.fn, jest.spyOn and other creatures

  6. Drills, Drills, Drills

Day 3: Diving Deeper (09:00-16:00)

  1. Async in Tests & Drills

  2. Legacy Refactorings

  3. Faking whole modules & Drills

  4. Unit Testing Good Practices

  5. Code Review Drills

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