chore: add content-type support to multi files in TestClient. #30
I'm using Molten for this project: https://github.com/jairojair/data-integration-example
So, I saw the client testing class don't have support to file content type, I need that to check, validate or maybe make a parser for that.
This way I changed (I little bit) the code to support that.
PS: Today the open api interface send a file with a right content type.