text: /* const assert = require('assert');
  const CalculatorTest = require('./calculator.service'); */
  const calculator = new CalculatorService();
  
  describe('Calculator Methods', () => {
      describe('Should be true when...', () => {
          it('the addition of 6 plus 4 is equals to 10', () => {
              const result = calculator.addition(6,4);
              expect(result).toBe(10);
          });
          it('the substraction of 6 minus 4 is equals to 2', () => {
              const result = calculator.substract(6,4);
              expect(result).toBe(2);
          });
          it('6 times 4 must be equals to 24', () => {
              const result = calculator.multiply(6,4);
              expect(result).toBe(24);
          });
          it('the division of 6 and 3 is equals to 2', () => {
              const result = calculator.divided(6,3);
              expect(result).toBe(2);
          });
      });
      describe('Should be false when...', () => {
          it('the division by 0 is not permitted', () => {
              expect(() => calculator.divided(6,0)).toThrow(new Error('No se puede dividir entre cero'));
          });
      });
  });
  