[Enhancement] : Add testing ability to middleware for PATCH | PUT file upload

[mshemuni]

Hello

I am trying to create a simple dictionary application using Django and support it with a Web API using Django-ninja. Two of the fields I use have FileField. Adding files using Django-ninja was not a problem. However, creating an endpoint for PUT and PATCH was problematic but I solved it according to #719.

The ability to upload files using PUT and PATCH was confirmed using the swagger. However, I cannot create a test case using Django's TestCase to test the endpoint. It still sends None instead of the file.

Can we have a way to create unit tests that are able to send files via PUT and PATCH?