text: var cn = require('./index.js');
  
  test('Object with only true values', () => {
    var result = cn({
      a: true,
      b: true,
      c: true,
      d: true,
      e: true,
      f: true
    });
  
    expect(result).toBe('f e d c b a');
  });
  
  test('Object with only false values', () => {
    var result = cn({
      a: false,
      b: false,
      c: false,
      d: false,
      e: false,
      f: false
    });
  
    expect(result).toBe('');
  });
  
  test('Object with values of different types', () => {
    var result = cn({
      a: true,
      b: false,
      c: 0,
      d: null,
      e: undefined,
      f: 1
    });
  
    expect(result).toBe('f a');
  });
  
  test('Empty object as parameter', () => {
    var result = cn({});
  
    expect(result).toBe('');
  });
  
  test('Empty array as parameter', () => {
    var result = cn([]);
  
    expect(result).toBe('');
  });
  
  test('String as parameter', () => {
    var result = cn('string');
  
    expect(result).toBe('5 4 3 2 1 0');
  });
  
  test('Number as parameter', () => {
    var result = cn(123456);
  
    expect(result).toBe('');
  });
  