Learning TDD with the Money Problem

• Workshop to learn TDD step-by-step from Saleem Siddiqui 's book :
  • Learning Test-Driven Development
    • The book explains the different concepts in 3 languages : Go, Python, JS
    • Thanks Saleem for your great sharing
• You will find other languages in this repository : C#, java, scala, Kotlin, F#
  • I have chosen to make a step-by-step guide from the book in C#

What is TDD

TDD is a technique borne of a set of beliefs about code :

• Simplicity - the art of maximizing the amount of work not done
• Obviousness and clarity are more virtuous than cleverness
• Writing uncluttered code is a key component of being successful

Test-Driven Development is a way of managing fear during programming - Kant Beck

Designing and structuring code

• TDD is not fundamentally about testing code
• Its purpose : improve the design and structure of the code
  • The Unit Tests that we end up with are an added bonus
  • Primary benefit : simplicity of design we get

A bias toward simplicity

• In software we can measure simplicity :
  • Fewer lines of code per feature
  • Lower Cyclomatic Complexity
  • Fewer side effects
  • Smaller runtime / memory requirements
• TDD forces us to craft the simplest thing that works
• Virtue isn't mystical :
  • Using TDD won't cut by half :
    • your development time
    • the lines of code
    • defect count
  • It will allow you to arrest the temptation to introduce artificial / contrived complexity

Increased Confidence

TDD increases our confidence in our code :

• Each new test flexes the system in new and previously untested ways
• Over time : the tests suite guards us against regression failures

About this repo

This is a monorepo containing all the source code for the "Learning Test-Driven Development" book, published by O'Reilly.

Prerequisites

• You need to install the runtime environment for the language you prefer use (Go, Python, C#, Scala, JS)
• To understand the evolution and purpose of the code, you need the accompanying book.

Workshop

• Follow the instructions for the different steps of this workshop :

  • Part 1 - Getting Started
  • Part 2 - Modularization
  • Part 3 - Features and Redesign
  • Part 4 - Finishing Up
  • Go Further

• Each part contains chapters in a step-by-step approach

  • At the end of each chapter you will find a step by step guide link
  • It will demonstrate my approach to solve the given problem in C#