diff --git a/data/model/test/test_model_blob.py b/data/model/test/test_model_blob.py
index d322d57cc..7adb2f5bf 100644
--- a/data/model/test/test_model_blob.py
+++ b/data/model/test/test_model_blob.py
@@ -1,3 +1,4 @@
+from app import storage
 from data import model, database
 
 from test.fixtures import *
@@ -30,3 +31,11 @@ def test_store_blob(initialized_db):
   assert blob_storage3.id != blob_storage.id
   assert blob_storage3.image_size == 1234
   assert blob_storage3.uncompressed_size == 5678
+
+
+def test_get_or_create_shared_blob(initialized_db):
+  shared = model.blob.get_or_create_shared_blob('sha256:abcdef', 'somecontent', storage)
+  assert shared.content_checksum == 'sha256:abcdef'
+
+  again = model.blob.get_or_create_shared_blob('sha256:abcdef', 'somecontent', storage)
+  assert shared == again