old_contents: import { expect } from 'chai';
  import sinon from 'sinon';
  import mongoToKnex from '../';
  
  describe('mongo-to-knex', function () {
    beforeEach(function () {
      const knex = require('knex')({});
      this.knexQuery = knex('table');
      sinon.stub(this.knexQuery, 'where').returns(this.knexQuery);
    });
  
    it('should apply a query with "$lt" operator', function () {
      mongoToKnex({ age: { $lt: 10 }}, this.knexQuery);
      expect(this.knexQuery.where.args[0]).to.eql([ '$lt', '<', 10 ]);
    });
  
    it('should apply a query with "$lte" operator', function () {
      mongoToKnex({ age: { $lte: 10 }}, this.knexQuery);
      expect(this.knexQuery.where.args[0]).to.eql([ '$lte', '<=', 10 ]);
    });
  
    it('should apply a query with "$gt" operator', function () {
      mongoToKnex({ age: { $gt: 10 }}, this.knexQuery);
      expect(this.knexQuery.where.args[0]).to.eql([ '$gt', '>', 10 ]);
    });
  
    it('should apply a query with "$gte" operator', function () {
      mongoToKnex({ age: { $gte: 10 }}, this.knexQuery);
      expect(this.knexQuery.where.args[0]).to.eql([ '$gte', '>=', 10 ]);
    });
  });
  
new_contents: import { expect } from 'chai';
  import sinon from 'sinon';
  import mongoToKnex from '../src';
  
  describe('mongo-to-knex', function () {
    beforeEach(function () {
      const knex = require('knex')({});
      this.knexQuery = knex('table');
      sinon.stub(this.knexQuery, 'where').returns(this.knexQuery);
    });
  
    it('should apply a query with "$lt" operator', function () {
      mongoToKnex({ age: { $lt: 10 }}, this.knexQuery);
      expect(this.knexQuery.where.args[0]).to.eql([ '$lt', '<', 10 ]);
    });
  
    it('should apply a query with "$lte" operator', function () {
      mongoToKnex({ age: { $lte: 10 }}, this.knexQuery);
      expect(this.knexQuery.where.args[0]).to.eql([ '$lte', '<=', 10 ]);
    });
  
    it('should apply a query with "$gt" operator', function () {
      mongoToKnex({ age: { $gt: 10 }}, this.knexQuery);
      expect(this.knexQuery.where.args[0]).to.eql([ '$gt', '>', 10 ]);
    });
  
    it('should apply a query with "$gte" operator', function () {
      mongoToKnex({ age: { $gte: 10 }}, this.knexQuery);
      expect(this.knexQuery.where.args[0]).to.eql([ '$gte', '>=', 10 ]);
    });
  });
  
subject: test over source code