added tests for the clean command
diff --git a/Lib/distutils/command/clean.py b/Lib/distutils/command/clean.py
index ba03d1f..90ef35f 100644
--- a/Lib/distutils/command/clean.py
+++ b/Lib/distutils/command/clean.py
@@ -11,7 +11,7 @@
 from distutils.dir_util import remove_tree
 from distutils import log
 
-class clean (Command):
+class clean(Command):
 
     description = "clean up temporary files from 'build' command"
     user_options = [