Unit Testing Components

Welcome to unit testing for React components! Unit testing helps ensure that the smallest, independent parts of your code — your components — work exactly as intended.

• What is a unit test? It's a test for a 'unit' of code, often a single function or component.
• Why test components? To catch bugs early, prevent regressions, and ensure your UI behaves predictably.
• We'll focus on isolating components and testing their specific functionality.

Jest is a popular JavaScript testing framework developed by Facebook. It's often used with React because it's fast, feature-rich, and includes everything you need for testing.

• Test Runner: Executes your tests and reports results.
• Assertion Library: Provides functions like expect to check if values meet certain conditions.
• Mocking Library: Helps isolate code by replacing dependencies with 'mock' versions.