tests: fix upload tests.

test/test_helpers/download_helper.rb

@@ -1,18 +1,14 @@
 module DownloadTestHelper
   def assert_downloaded(expected_filesize, source)
-    tempfile = Tempfile.new("danbooru-test")
-    download = Downloads::File.new(source, tempfile.path)
-
     assert_nothing_raised(Downloads::File::Error) do
-      download.download!
+      tempfile = Downloads::File.new(source).download!
+      assert_equal(expected_filesize, tempfile.size, "Tested source URL: #{source}")
+      tempfile.close!
     end
-
-    assert_equal(expected_filesize, tempfile.size, "Tested source URL: #{source}")
   end
 
   def assert_rewritten(expected_source, test_source)
-    tempfile = Tempfile.new("danbooru-test")
-    download = Downloads::File.new(test_source, tempfile.path)
+    download = Downloads::File.new(test_source)
 
     rewritten_source, _, _ = download.before_download(test_source, {})
     assert_match(expected_source, rewritten_source, "Tested source URL: #{test_source}")

test/test_helpers/upload_test_helper.rb

@@ -1,23 +1,10 @@
 module UploadTestHelper
-  def upload_file(path, content_type, filename)
-    tempfile = Tempfile.new(filename)
-    FileUtils.copy_file(path, tempfile.path)
+  def upload_file(path)
+    file = Tempfile.new(binmode: true)
+    IO.copy_stream("#{Rails.root}/#{path}", file.path)
+    uploaded_file = ActionDispatch::Http::UploadedFile.new(tempfile: file, filename: File.basename(path))
 
-    (class << tempfile; self; end).class_eval do
-      alias local_path path
-      define_method(:tempfile) {self}
-      define_method(:original_filename) {filename}
-      define_method(:content_type) {content_type}
-    end
-
-    tempfile
-  end
-
-  def upload_jpeg(path)
-    upload_file(path, "image/jpeg", File.basename(path))
-  end
-
-  def upload_zip(path)
-    upload_file(path, "application/zip", File.basename(path))
+    yield uploaded_file if block_given?
+    uploaded_file
   end
 end