Example in documentation for a test for upload via FileUploadParser

[AlekseiKhatkevich]

Hi
It is rather question/proposition then bug or issue.

Is it possible to add in documentation example of how to test file/image upload api endpoint that uses FileUploadParser?
It is kind of unclear as FileUploadParser uses binary protocol and self.client and rest test client accept only json or multipart format.

Sorry if question is naive or dumb.

Thanks for awesome framework and good luck!