APIRequestor: don't mutate incoming multipart headers #1091
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Pulled out from #1088 since it's a behavior change.
Also fixes the
file
tests. Unfortunately the special multipart form behavior is implemented in api_requestor, but our mocks mock at the api_requestor level so in order to actually make assertions about multipart you have to mock at the http_client level.These tests were accidentally working because of the unintended mutation. Stopping the mutation broke them, but required the tests to change.
FileUpload is an alias for File, so I deleted
file_upload_test.py
as it's basically completely redundant.