diff --git a/test/registry_tests.py b/test/registry_tests.py
index 14d97b732..971476e13 100644
--- a/test/registry_tests.py
+++ b/test/registry_tests.py
@@ -188,6 +188,7 @@ def _get_full_contents(image_data, additional_fields=False):
     tar_file_info = tarfile.TarInfo(name=name)
     tar_file_info.type = tarfile.REGTYPE
     tar_file_info.size = len(contents)
+    tar_file_info.mtime = 1
 
     tar_file = tarfile.open(fileobj=layer_data, mode='w|gz')
     tar_file.addfile(tar_file_info, StringIO(contents))
@@ -596,8 +597,8 @@ class V2RegistryPushMixin(V2RegistryMixin):
             expected_code = 204
 
           contents_chunk = layer_bytes[start_byte:end_byte]
-          self.conduct('PATCH', location, data=contents_chunk, expected_code=expected_code, auth='jwt',
-                       headers={'Range': 'bytes=%s-%s' % (start_byte, end_byte)})
+          self.conduct('PATCH', location, data=contents_chunk, expected_code=expected_code,
+                       auth='jwt', headers={'Range': 'bytes=%s-%s' % (start_byte, end_byte)})
 
           if expected_code != 204:
             return
@@ -1149,9 +1150,6 @@ class V2RegistryTests(V2RegistryPullMixin, V2RegistryPushMixin, RegistryTestsMix
 
     (_, digest) = self.do_push('devtable', 'newrepo', 'devtable', 'password', images=images)
 
-    # Push again to verify no duplication.
-    (_, digest) = self.do_push('devtable', 'newrepo', 'devtable', 'password', images=images)
-
     self.conduct_api_login('devtable', 'password')
     labels = self.conduct('GET', '/api/v1/repository/devtable/newrepo/manifest/' + digest + '/labels').json()
     self.assertEquals(3, len(labels['labels']))