Test-Driven UI Development

2.1 Definitions

• Test-Driven Development (TDD): A development methodology where tests are written prior to the code.
• Unit Testing: Testing individual components in isolation to ensure they behave as expected.
• UI Components: The building blocks of user interfaces, such as buttons, forms, and dialogs.

2.2 Importance of TDD

• Ensures high code quality.
• Facilitates refactoring.
• Increases developer confidence.
• Reduces debugging time.

3.1 Steps in TDD

1. Write a Test: Begin by writing a test for a new feature or functionality.
2. Run the Test: Execute the test that should fail since the feature is not implemented yet.
3. Write the Code: Implement the minimum code required to pass the test.
4. Run the Test Again: Check if the test passes. If it does, move to the next step.
5. Refactor: Clean up the code while ensuring the test still passes.
6. Repeat: Continue this process for new features.

4.1 Tips for Successful TDD

• Keep tests small and focused.
• Avoid complex logic in tests.
• Use descriptive naming conventions for tests.
• Maintain a fast feedback loop.
• Utilize testing libraries such as Jest or Mocha.

4.2 Example Code Snippet

import React from 'react';
import { render, screen } from '@testing-library/react';
import Button from './Button'; // Assume Button is a UI component

test('renders button with correct text', () => {
    render();
    const buttonElement = screen.getByText(/Click Me/i);
    expect(buttonElement).toBeInTheDocument();
});