test_system: rename Checker to ImmutableChecker, to make room for a mutable one

diff --git a/src/allmydata/test/test_system.py b/src/allmydata/test/test_system.py
index dd920fc0fb662dbe723cd88d137c5c801ab010c6..af64ec97cac342b34aaddb16b930d2b7a60a8fe6 100644 (file)
--- a/src/allmydata/test/test_system.py
+++ b/src/allmydata/test/test_system.py
@@ -1693,7 +1693,7 @@ class SystemTest(SystemTestMixin, unittest.TestCase):
         return d
 
 
-class Checker(ShareManglingMixin, unittest.TestCase):
+class ImmutableChecker(ShareManglingMixin, unittest.TestCase):
     def setUp(self):
         # Set self.basedir to a temp dir which has the name of the current test method in its
         # name.