Fix format string in assert_in()/assert_not_in()

Author: jwilk

tests/util.py

@@ -109,10 +109,10 @@ def assert_node(node, cls=None, **kwargs):
 except ImportError:
     def assert_in(x, thing, msg=''):
         if x not in thing:
-            assert False, msg or '%r is not in %r%r' % (x, thing)
+            assert False, msg or '%r is not in %r' % (x, thing)
     def assert_not_in(x, thing, msg=''):
         if x in thing:
-            assert False, msg or '%r is in %r%r' % (x, thing)
+            assert False, msg or '%r is in %r' % (x, thing)
 
 
 def skip_if(condition, msg=None):