old_contents: var db = source('lib/database');
  
  describe('database tests', function () {
    it('should test getting data', function (done) {
      expect(db).to.have.property('getPeople');
      db.getPeople.should.be.a('function');
  
      db.getPeople(function (err, people) {
        if (err) {
          return done(err);
        }
  
        expect(people).to.be.an('array');
        done();
      });
    });
  
    it('should check the internal sandwich function', function () {
      var data = [];
  
      expect(db).to.have.property('addSandwich');
      db.addSandwich.should.be.a('function');
  
      db.addSandwich(data);
  
      expect(data).to.have.length(1);
      expect(data).to.deep.equal([{ 'id': 6, 'name': 'A Large Sandwich' }]);
    });
  
    // an example of a pending test, kind of like a reminder that it should be filled in later
    it('should test the database error function');
  
    // skip also makes it a pending test case, and the test doesn't execute.
    // from the Mocha documentation:
    //   '[skip] is favoured over commenting out tests which you may forget to uncomment'
    it.skip('should test the error function', function (done) {
      expect(db).to.have.property('getError');
      db.getError.should.be.a('function');
  
      db.getError(function (err) {
        expect(err).to.be.an.instanceOf(Error);
        expect(err.message).to.equal('database error');
  
        // getting an error in this case means the test passed, lol
        done();
      });
    });
  });
  
new_contents: var db = source('lib/database/mongoose');
  
  describe('database tests', function () {
    it('should test getting data', function (done) {
      expect(db).to.have.property('getPeople');
      db.getPeople.should.be.a('function');
  
      db.getPeople(function (err, people) {
        if (err) {
          return done(err);
        }
  
        expect(people).to.be.an('array');
        done();
      });
    });
  
    it('should check the internal sandwich function', function () {
      var data = [];
  
      expect(db).to.have.property('addSandwich');
      db.addSandwich.should.be.a('function');
  
      db.addSandwich(data);
  
      expect(data).to.have.length(1);
      expect(data).to.deep.equal([{ 'id': 6, 'name': 'A Large Sandwich' }]);
    });
  
    // an example of a pending test, kind of like a reminder that it should be filled in later
    it('should test the database error function');
  
    // skip also makes it a pending test case, and the test doesn't execute.
    // from the Mocha documentation:
    //   '[skip] is favoured over commenting out tests which you may forget to uncomment'
    it.skip('should test the error function', function (done) {
      expect(db).to.have.property('getError');
      db.getError.should.be.a('function');
  
      db.getError(function (err) {
        expect(err).to.be.an.instanceOf(Error);
        expect(err.message).to.equal('database error');
  
        // getting an error in this case means the test passed, lol
        done();
      });
    });
  });
  
subject: Update backend database test to reference mongoose library