Remove explicit inheritance from object in test suite

Author: EliahKagan

test/lib/helper.py

@@ -65,7 +65,7 @@ def fixture(name):
 # { Adapters
 
 
-class StringProcessAdapter(object):
+class StringProcessAdapter:
     """Allows strings to be used as process objects returned by subprocess.Popen.
 
     This is tailored to work with the test system only.

test/test_index.py

@@ -868,7 +868,7 @@ def test_add_a_file_with_wildcard_chars(self, rw_dir):
     def test__to_relative_path_at_root(self):
         root = osp.abspath(os.sep)
 
-        class Mocked(object):
+        class Mocked:
             bare = False
             git_dir = root
             working_tree_dir = root

test/test_submodule.py

@@ -1044,7 +1044,7 @@ def test_branch_renames(self, rw_dir):
 
     @skipUnless(is_win, "Specifically for Windows.")
     def test_to_relative_path_with_super_at_root_drive(self):
-        class Repo(object):
+        class Repo:
             working_tree_dir = "D:\\"
 
         super_repo = Repo()