diff -up Markdown-2.6.11/tests/__init__.py.orig markdown/tests/__init__.py
--- Markdown-2.6.11/tests/__init__.py.orig	2018-06-03 10:51:55.518781537 +0000
+++ Markdown-2.6.11/tests/__init__.py	2018-06-03 10:59:34.088350325 +0000
@@ -185,5 +185,7 @@ def run():
     # Except for the warnings that shouldn't
     warnings.filterwarnings('default', category=PendingDeprecationWarning)
     warnings.filterwarnings('default', category=DeprecationWarning, module='markdown')
+    warnings.filterwarnings('default', category=DeprecationWarning, module='yaml')
+    warnings.filterwarnings('default', category=DeprecationWarning, module='nose')
 
     nose.main(addplugins=[HtmlOutput(), Markdown()])