Testing Practice

A hands-on exploration of Test-Driven Development (TDD) using Jest as part of The Odin Project curriculum. This repository documents my learning journey through writing comprehensive unit tests for various JavaScript functions.

📋 Table of Contents

• Testing Practice
  • 📋 Table of Contents
  • ✨ Features
  • 🚀 Getting Started
    • Prerequisites
    • Installation
    • Running Tests
  • 💡 Future Improvements
  • 📚 What I Learned
  • 🛠️ Technologies Used
  • 🔗 Resources
  • 🙏 Acknowledgments

✨ Features

• String Utilities - capitalize() and reverseString() functions with full test coverage
• Calculator Object - Basic arithmetic operations (add, subtract, multiply, divide) with comprehensive tests
• Caesar Cipher - Character shifting cipher with case preservation and wrapping logic
• Array Analysis - Statistical analysis function returning average, min, max, and length
• Test-Driven Development - All functions implemented using TDD methodology with Jest

🚀 Getting Started

Want to run this project locally? Here's how:

Prerequisites

• Node.js (version 14 or higher)
• npm (comes with Node.js)
• Basic understanding of JavaScript and unit testing

Installation

1. Clone the repository

   git clone https://github.com/top-submissions/fullstackjs-testing-practice.git
   cd fullstackjs-testing-practice

1. Install dependencies

   npm install

1. Verify installation

   npm test

Running Tests

Run all tests:

npm test

Run tests in watch mode:

npm test -- --watch

Run tests with coverage:

npm test -- --coverage

💡 Future Improvements

If I were to continue working on this project, here's what I'd add:

• Add edge case tests for division by zero
• Implement integration tests for combined function usage
• Add performance benchmarks for array analysis with large datasets
• Implement additional cipher algorithms (ROT13, Vigenère)
• Add TypeScript support with type definitions
• Create visual test coverage reports
• Add continuous integration with GitHub Actions
• Implement property-based testing with fast-check

📚 What I Learned

• Test-Driven Development - Writing tests first helps clarify requirements and leads to better code design
• Jest Framework - Mastered Jest's testing syntax, matchers, and test organization with describe/test blocks
• Edge Case Handling - Importance of testing boundary conditions, empty inputs, and invalid data
• Code Coverage - Understanding what code coverage metrics mean and how to achieve comprehensive test coverage
• Modular Design - Structuring code into small, testable functions with single responsibilities
• Array Methods - Leveraging reduce(), map(), and spread operators for elegant solutions
• Character Encoding - Working with character codes and ASCII values for the Caesar cipher implementation

🛠️ Technologies Used

• Jest - JavaScript testing framework
• Babel - JavaScript transpiler for ES6+ support
• Node.js - JavaScript runtime environment
• ES6 Modules - Modern JavaScript module system

🔗 Resources

• Jest Documentation
• The Odin Project - Testing Basics
• The Odin Project - Testing Practice
• MDN - Array Methods

🙏 Acknowledgments

• The Odin Project - For providing an amazing free curriculum

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Built with 💡 and ☕ as part of my journey through The Odin Project