What is test-driven development (TDD) and how can it be practiced in Ruby on Rails?

In Ruby on Rails, a popular web application framework, there are several types of testing that developers employ to ensure the quality and reliability of their applications. Let's discuss the three main types of testing in Ruby on Rails: unit testing, integration testing, and system testing. 1. Unit Testing: Unit testing focuses on testing individual components or units of code in isolation. In Ruby on Rails, the primary unit of testing is typically the model, although it can also include methods in controllers and other classes. Unit tests are designed to verify that each unit of code functions correctly and independently. These tests are often written using a testing framework like RSpec or MiniTest. They help identify and catch bugs early in the development process, making it easier to isolate and fix issues within specific units of code. 2. Integration Testing: Integration testing involves testing how different compo....