text: // Let's test drive summing numbers
  // sum() -> 0
  // sum(5) -> 5
  // sum(4, 5, 6) -> 15
  import sum from '../sum';
  // var sum = require('./sum');
  
  test('sum(0) should return 0', () => {
    const result = sum();
    expect(result).toBe(0);
  });
  
  test('passing a single argument, returns just that', () => {
    const result = sum(5);
    expect(result).toBe(5);
  });
  
  test('passing any numbers, returns their sum', () => {
      const result = sum(4,5,6);
      expect(result).toBe(15);
  });