turn datapath into a classmethod

1 files changed, 3 insertions, 2 deletions

diff --git a/testlib.py b/testlib.py
index 2f5489e..22526c2 100644
--- a/testlib.py
+++ b/testlib.py
@@ -1090,9 +1090,10 @@ class TestCase(unittest.TestCase):
     # instantiated for each test run)
     datadir = classproperty(cached(datadir))
 
-    def datapath(self, fname):
+    def datapath(cls, fname):
         """joins the object's datadir and `fname`"""
-        return osp.join(self.datadir, fname)
+        return osp.join(cls.datadir, fname)
+    datapath = classmethod(datapath)
 
     def set_description(self, descr):
         """sets the current test's description.