Reusable file object

[Shudrum]

Hello there!

First of all: thank you for this project! Life & time saver.

I am using this middleware on several projects, and I have, on all of those project, the same problem:

How can I correctly test my file uploading system?

The problem is:
I do not only upload files, but I also do some business transformation on them. As I try to keep everything as simple as possible: I just use your file object without decorator or anything else.

So, for the tests… it need many boilerplates or… a decorator…

This is why this pull request:

I would love to have a real FileObject / File or just a factory. I choose the factory option to keep this project also simple.

The steps are split on several commits. If you agree on the principe, I would like to talk about the last one: 64ff2b5

I've exposed the fileFactory, so people who want to use it can simply do:

const fileFactory = require('express-fileupload').fileFactory;

If you just want to replace it by:

const fileFactory = require('express-fileupload/lib/fileFactory');

Just ask.

To finish, as it is quite like a low level functionality, I don't think it should be documented, people who want to test it can find it easily by looking at this repository.

Thank you!

[coveralls]

Coverage increased (+2.2%) to 98.0% when pulling 87d3d5c on Shudrum:reusable-file-object into 9314d38 on richardgirges:master.

[r3wt]

this is awesome. great work @Shudrum

[Shudrum]

Thank you ☺️

[richardgirges]

NICE! Give me a day or two to digest this, I may have some questions. But I agree with the direction and need for this! It'll help me out too for testing.

[richardgirges]

I'm doing a small revamp of the project. I'm going to merge this is in and make my changes on top of your changes (adding new options, changing some lint rules, etc). Thanks so much for taking the time to push this!

[Shudrum]

You're welcome!