Test-driven development (TDD) is a software development practice that involves writing tests before writing code.Bun Test is a built-in testing tool that helps with TDD and is known for its speed and simplicity.To set up your JavaScript project with Bun Test, you can use the bun init command.When writing your first test with Bun Test, it's important to define all of the testing scenarios you want to cover.To run the same tests with different input values, you can use the each() method in Bun Test.Test coverage is a metric that measures the percentage of your codebase executed during automated tests.While high test coverage is important, it's not the only measure of code quality.Adopting TDD promotes a mindset of writing testable, modular code from the start.Start small, iterate often, and let your tests guide your implementation.By focusing on requirements first and ensuring functionality through iterative testing, you can write clean, maintainable, and robust code.