beforeEach does not execute for each test

[fatso83]

See sinonjs/sinon#2022 (comment).

Testcase below should print the "beforeEach" twice, but it only happens once.

const assert = require('chai').assert;
const sinon = require('sinon');

describe('resetHistory', function() {
  var num = null;


  var i = 0;
  beforeEach(function() {
    num = sinon.createStubInstance(Number);
    console.log('beforeEach', ++i);
  });

  afterEach(() => {
    // Restore the default sandbox here
    sinon.restore();
  });

  describe('called on individual stub method', function() {
    it('should clear "called" status on stub', function() {
      num.toFixed();
      assert.isTrue(num.toFixed.called);
      num.toFixed.resetHistory();
      assert.isFalse(num.toFixed.called);
    });
  });

  describe('called on module', function() {
    it('should clear "called" status on all stubs', function() {
      num.toFixed();
      assert.isTrue(num.toFixed.called);
      sinon.resetHistory();
      assert.isFalse(num.toFixed.called);
    });
  });
});