No need to (badly) mock transfer task + small refactor

Signed-off-by: onekiloparsec <[email protected]>

tests/tasks.py

@@ -1,29 +1,14 @@
 from queued_storage.tasks import Transfer
-from queued_storage.utils import import_attribute
 
 from .models import TestModel
 
 
-def test_task(name, cache_key,
-              local_path, remote_path,
-              local_options, remote_options):
-    local = import_attribute(local_path)(**local_options)
-    remote = import_attribute(remote_path)(**remote_options)
-    remote.save(name, local.open(name))
-
-
-def delay(*args, **kwargs):
-    test_task(*args, **kwargs)
-
-test_task.delay = delay
-
-
-class NoneReturningTask(Transfer):
+class NoneReturningTransferTask(Transfer):
     def transfer(self, *args, **kwargs):
         return None
 
 
-class RetryingTask(Transfer):
+class RetryingTransferTask(Transfer):
     def transfer(self, *args, **kwargs):
         if TestModel.retried:
             return True