diff --git a/blender_asset_tracer/pack/shaman/transfer.py b/blender_asset_tracer/pack/shaman/transfer.py
index 0395fe6..b7381f5 100644
--- a/blender_asset_tracer/pack/shaman/transfer.py
+++ b/blender_asset_tracer/pack/shaman/transfer.py
@@ -30,6 +30,9 @@ import blender_asset_tracer.pack.transfer as bat_transfer
 MAX_DEFERRED_PATHS = 8
 MAX_FAILED_PATHS = 8
 
+response_file_unknown = "file-unknown"
+response_already_uploading = "already-uploading"
+
 
 class FileInfo:
     def __init__(self, checksum: str, filesize: int, abspath: pathlib.Path):
@@ -204,9 +207,9 @@ class ShamanTransferrer(bat_transfer.FileTransferer):
                 self.error_set(msg)
                 return None
 
-            if response == 'does-not-exist':
+            if response == response_file_unknown:
                 to_upload.appendleft(path)
-            elif response == 'already-uploading':
+            elif response == response_already_uploading:
                 to_upload.append(path)
             elif response == 'ERROR':
                 msg = 'Error from Shaman: %s' % path
diff --git a/tests/test_shaman_transfer.py b/tests/test_shaman_transfer.py
index cdced05..14bf1e8 100644
--- a/tests/test_shaman_transfer.py
+++ b/tests/test_shaman_transfer.py
@@ -65,7 +65,7 @@ class AbstractChecksumTest(AbstractBlendFileTest):
             self.assertEqual('text/plain', request.headers['Content-Type'])
             self.assertValidCheckoutDef(request.body)
 
-            body = 'does-not-exist path/in/pack/test1.blend\n'
+            body = 'file-unknown path/in/pack/test1.blend\n'
             return 200, {'Content-Type': 'text/plain'}, body
 
         def mock_checkout_create(request):
@@ -87,5 +87,5 @@ class AbstractChecksumTest(AbstractBlendFileTest):
         trans.queue_copy(self.test_file2, pathlib.Path('/') / self.packed_names[self.test_file2])
         trans.done_and_join()
 
-        self.assertFalse(trans.has_error)
+        self.assertFalse(trans.has_error, trans.error_message())
         self.assertEqual('DA/-JOB-ID', trans.checkout_location)