fix test on win32

(cherry picked from commit 41be41e72522d71792bdbbdc391ad983af88d0a5)
diff --git a/test/test_template.py b/test/test_template.py
index c4ab99a..c5873dc 100644
--- a/test/test_template.py
+++ b/test/test_template.py
@@ -1117,7 +1117,7 @@
         eq_(
             canary,
             [os.path.join(module_base, "modtest.html.py"),
-            os.path.join(module_base, "subdir/modtest.html.py")]
+            os.path.join(module_base, "subdir", "modtest.html.py")]
         )
 
 class FilenameToURITest(TemplateTest):