API: File upload infrastructure

src/pretix/testutils/api.py

@@ -0,0 +1,11 @@
+from rest_framework.renderers import BaseRenderer
+
+
+class UploadRenderer(BaseRenderer):
+    media_type = None
+    format = 'upload'
+    charset = 'utf-8'
+
+    def render(self, data, accepted_media_type=None, renderer_context=None):
+        self.media_type = data['media_type']
+        return data['file']