text: 'use strict';
  
  const formatCharge = require('../formatCharge');
  
  test('formatCharge', () => {
    expect(formatCharge(-2)).toBe('-2');
    expect(formatCharge(-1)).toBe('-1');
    expect(formatCharge(0)).toBe('');
    expect(formatCharge(1)).toBe('+');
    expect(formatCharge(2)).toBe('+2');
  });
  