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const { expect } = require('chai');
const sinon = require('sinon');
const timeElapsed = require('./time-elapsed.js');

describe('Time Elapsed', () => {
  let clock;

  before(() => {
    timeElapsed.start();
    clock = sinon.useFakeTimers();
  });

  after(() => {
    timeElapsed.stop();
    clock.restore();
  });

  it('should increment seconds', () => {
    clock.tick(1000);
    expect(timeElapsed.getSeconds()).to.equal(1);
  });

  it('should increment minutes and reset seconds', () => {
    clock.tick(59000);
    expect(timeElapsed.getMinutes()).to.equal(1);
    expect(timeElapsed.getSeconds()).to.equal(0);
  });

  it('should increment hours and reset minutes', () => {
    clock.tick(3590000);
    expect(timeElapsed.getHours()).to.equal(1);
    expect(timeElapsed.getMinutes()).to.equal(0);
  });
});

# Refactored and optimized code

def sum_and_multiply(x1, x2):
    # Rename variables to be more descriptive
    num1 = x1
    num2 = x2

    # Calculate the sum and multiply it by 10
    total_sum = num1 + num2
    multiplied_sum = total_sum * 10

    # Create an empty list to store the results
    result_list = []

    # Iterate through the range of the multiplied sum
    for i in range(multiplied_sum):
        # Append the double of each value to the list
        result_list.append(i * 2)

    return result_list

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