export default function capitalizeWords(sentence) {
  // TODO: Capitalize first letter of each word
  throw new Error('Not implemented');
}

import capitalizeWords from './capitalizeWords';

describe('capitalizeWords', () => {
  test('capitalizes each word in a simple sentence', () => {
    expect(capitalizeWords('hello world')).toBe('Hello World');
  });

  test('handles mixed casing', () => {
    expect(capitalizeWords('jaVaScript IS fUn')).toBe('Javascript Is Fun');
  });

  test('preserves multiple spaces', () => {
    expect(capitalizeWords('  welcome   to  earth  ')).toBe('  Welcome   To  Earth  ');
  });

  test('returns empty string for empty input', () => {
    expect(capitalizeWords('')).toBe('');
  });
});