fix test skip and py3.6

test/test_evaluate/test_docstring.py

@@ -183,6 +183,8 @@ def test_numpydoc_parameters_alternative_types():
     assert 'numerator' in names
     assert 'append' in names
 
+@pytest.mark.skipif(numpydoc_unavailable, 
+                    reason='numpydoc module is unavailable')
 def test_numpydoc_returns():
     s = dedent('''
     def foobar():
@@ -242,7 +244,9 @@ def test_numpydoc_returns_alternative_types():
     assert 'capitalize' not in names
     assert 'numerator' in names
     assert 'append' in names
-
+    
+@pytest.mark.skipif(numpydoc_unavailable, 
+                    reason='numpydoc module is unavailable')
 def test_numpydoc_returns_list_of():
     s = dedent('''
     def foobar():

tox.ini

@@ -1,5 +1,5 @@
 [tox]
-envlist = py26, py27, py33, py34, py35
+envlist = py26, py27, py33, py34, py35, py36
 [testenv]
 deps =
     pytest>=2.3.5
@@ -35,6 +35,10 @@ deps =
     numpydoc
     {[testenv]deps}
 [testenv:py35]
+deps =
+    numpydoc
+    {[testenv]deps}
+[testenv:py36]
 deps =
     numpydoc
     {[testenv]deps}