Test-Driven Development (TDD)

TDD is a software development methodology where tests are written before the code they are intended to test. 

Its purpose is to reduce the number of bugs early on and to increase testability. 

It follows a short, iterative cycle: 

TDD helps to ensure that code is testable, well-designed and meets its requirements.

 TDD mainly comprises three cycles - the Red-Green-Refactor concept:

Think of TDD like writing the rules of a game before you play it.

What it is: A software development method where you write tests first, then write the code to pass those tests.

Steps:
Write a test that describes what the code should do.
Run the test (it fails because the code doesn’t exist yet).
Write the minimum code needed to pass the test.
Refactor the code (just means `clean it up`).
Repeat.

Why it’s awesome:
Helps catch bugs early.
Makes sure your code does what it’s supposed to.
Encourages clean, modular code.