We do not have this optional test dependency packaged yet.

--- mako-1.3.6/tox.ini.orig
+++ mako-1.3.6/tox.ini
@@ -5,7 +5,6 @@
 cov_args=--cov=mako --cov-report term --cov-report xml
 
 deps=pytest>=3.1.0
-     beaker
      markupsafe
      pygments
      babel