diff --git a/test_objstorage_api.py b/test_objstorage_api.py
index 6676cd7..4e43f18 100644
--- a/test_objstorage_api.py
+++ b/test_objstorage_api.py
@@ -1,97 +1,88 @@
 # Copyright (C) 2015  The Software Heritage developers
 # See the AUTHORS file at the top-level directory of this distribution
 # License: GNU General Public License version 3, or any later version
 # See top-level LICENSE file for more information
 
-import os
 import tempfile
 import unittest
 
 from nose.tools import istest
 from nose.plugins.attrib import attr
 
 from swh.core import hashutil
 from swh.storage.exc import ObjNotFoundError, Error
 from swh.storage.tests.server_testing import ServerTestFixture
 from swh.storage.objstorage.api.client import RemoteObjStorage
 from swh.storage.objstorage.api.server import app
 
 
 @attr('db')
 class TestRemoteObjStorage(ServerTestFixture, unittest.TestCase):
     """ Test the remote archive API.
     """
 
     def setUp(self):
         self.config = {'storage_base': tempfile.mkdtemp(),
-                       'storage_depth': 3}
+                       'storage_slicing': '0:1/0:5'}
         self.app = app
         super().setUp()
         self.objstorage = RemoteObjStorage(self.url())
 
     def tearDown(self):
         super().tearDown()
 
     @istest
     def content_add(self):
         content = bytes('Test content', 'utf8')
         id = self.objstorage.content_add(content)
         self.assertEquals(self.objstorage.content_get(id), content)
 
     @istest
     def content_get_present(self):
         content = bytes('content_get_present', 'utf8')
         content_hash = hashutil.hashdata(content)
         id = self.objstorage.content_add(content)
         self.assertEquals(content_hash['sha1'], id)
 
     @istest
     def content_get_missing(self):
         content = bytes('content_get_missing', 'utf8')
         content_hash = hashutil.hashdata(content)
         with self.assertRaises(ObjNotFoundError):
             self.objstorage.content_get(content_hash['sha1'])
 
     @istest
     def content_get_random(self):
         ids = []
         for i in range(100):
             content = bytes('content_get_present', 'utf8')
             id = self.objstorage.content_add(content)
             ids.append(id)
         for id in self.objstorage.content_get_random(50):
             self.assertIn(id, ids)
 
     @istest
     def content_check_invalid(self):
         content = bytes('content_check_invalid', 'utf8')
-        id = self.objstorage.content_add(content)
-        hex_obj_id = hashutil.hash_to_hex(id)
-        dir_path = os.path.join(
-            self.config['storage_base'],
-            *[hex_obj_id[i*2:i*2+2]
-              for i in range(int(self.config['storage_depth']))]
-        )
-        path = os.path.join(dir_path, hex_obj_id)
-        content = list(content)
-        with open(path, 'bw') as f:
-            content[0] = (content[0] + 1) % 128
-            f.write(bytes(content))
+        invalid_id = hashutil.hashdata(b'invalid content')['sha1']
+        # Add the content with an invalid id.
+        self.objstorage.content_add(content, invalid_id)
+        # Then check it and expect an error.
         with self.assertRaises(Error):
-            self.objstorage.content_check(id)
+            self.objstorage.content_check(invalid_id)
 
     @istest
     def content_check_valid(self):
         content = bytes('content_check_valid', 'utf8')
         id = self.objstorage.content_add(content)
         try:
             self.objstorage.content_check(id)
         except:
             self.fail('Integrity check failed')
 
     @istest
     def content_check_missing(self):
         content = bytes('content_check_valid', 'utf8')
         content_hash = hashutil.hashdata(content)
         with self.assertRaises(ObjNotFoundError):
             self.objstorage.content_check(content_hash['sha1'])