TST run tests without parsel by default, ann environments with parsel

Author: kmike

tests/test_html_text.py

@@ -101,6 +101,7 @@ def test_bad_punct_whitespace():
 
 
 def test_selectors(all_options):
+    pytest.importorskip("parsel")
     html = (u'<span><span id="extract-me">text<a>more</a>'
             '</span>and more text <a> and some more</a> <a></a> </span>')
     # Selector

tox.ini

@@ -1,11 +1,11 @@
 [tox]
-envlist = py27,py35,py36,py37
+envlist = py27,py35,py36,py37,{py2,py3}-parsel
 
 [testenv]
 deps =
     pytest
     pytest-cov
-    parsel
+    {py2,py3}-parsel: parsel
 
 commands =
     pip install -U pip