Remove unused imports in tests (GH-14518)

diff --git a/Lib/test/test_pyclbr.py b/Lib/test/test_pyclbr.py
index 5313040..4385271 100644
--- a/Lib/test/test_pyclbr.py
+++ b/Lib/test/test_pyclbr.py
@@ -3,15 +3,13 @@
    Nick Mathewson
 '''
 
-import os
 import sys
 from textwrap import dedent
 from types import FunctionType, MethodType, BuiltinFunctionType
 import pyclbr
 from unittest import TestCase, main as unittest_main
-from test import support
 from test.test_importlib import util as test_importlib_util
-from functools import partial
+
 
 StaticMethodType = type(staticmethod(lambda: None))
 ClassMethodType = type(classmethod(lambda c: None))