tests: fix broken tests.

app/logical/source/extractor/moebooru.rb

@@ -66,6 +66,10 @@ module Source
           elsif api_response[:file_url].present?
             api_response[:file_url][/\.(jpg|jpeg|png|gif)\z/i, 1]
 
+          # on yande.re, the file extension doesn't matter, any random string will work. This means we can't guess the true file extension.
+          elsif domain == "yande.re"
+            "png"
+
           # the api_response wasn't available because it's a deleted post.
           elsif post_md5.present?
             %w[jpg png gif].find { |ext| http_exists?("https://#{domain}/image/#{post_md5}.#{ext}") }

app/models/media_asset.rb

@@ -246,6 +246,8 @@ class MediaAsset < ApplicationRecord
       # This can't be called inside a transaction because the transaction will
       # fail if there's a RecordNotUnique error when the asset already exists.
       def upload!(media_file, &block)
+        media_file = MediaFile.open(media_file) unless media_file.is_a?(MediaFile)
+
         raise Error, "File is corrupt" if media_file.is_corrupt?
 
         media_asset = create!(file: media_file, status: :processing)