If rst missing skip; initial attempt to test structuredtext.

Try to set up structured text testing. I can't get StructuredText to
run under python3, but this test passes under python2. Once I get
StructuredText to pass under p3, I'll install StructuredText to ci
and these tests won't be skipped.

Also if import for reStructuredText fails, skip the test rather than
silently passing.

Author: rouilj

test/test_templating.py

@@ -5,10 +5,29 @@
 from roundup.cgi.templating import *
 from .test_actions import MockNull, true
 
+
+import pytest
+from .pytest_patcher import mark_class
+
 try:
     from docutils.core import publish_parts as ReStructuredText
+    skip_rst = lambda func, *args, **kwargs: func
 except ImportError:
     ReStructuredText = None
+    skip_rst = mark_class(pytest.mark.skip(
+        reason='ReStructuredText not available'))
+
+try:
+    from StructuredText.StructuredText import HTML as StructuredText
+    skip_stext = lambda func, *args, **kwargs: func
+except ImportError:
+    try: # older version
+        import StructuredText
+        skip_stext = lambda func, *args, **kwargs: func
+    except ImportError:
+        StructuredText = None
+        skip_stext = mark_class(pytest.mark.skip(
+                reason='StructuredText not available'))
 
 from roundup.anypy.strings import u2s, s2u
 
@@ -217,13 +236,22 @@ def test_string_plain_or_hyperlinked(self):
 
         self.assertEqual(p.hyperlinked(), 'A string &lt;b&gt; with <a href="mailto:[email protected]">[email protected]</a> embedded &amp;lt; html&lt;/b&gt;')
 
+    @skip_rst
     def test_string_rst(self):
         p = StringHTMLProperty(self.client, 'test', '1', None, 'test', u2s(u'A string with [email protected] *embedded* \u00df'))
         if ReStructuredText:
             self.assertEqual(p.rst(), u2s(u'<div class="document">\n<p>A string with <a class="reference external" href="mailto:cmeerw&#64;example.com">cmeerw&#64;example.com</a> <em>embedded</em> \u00df</p>\n</div>\n'))
         else:
             self.assertEqual(p.rst(), u2s(u'A string with <a href="mailto:[email protected]">[email protected]</a> *embedded* \u00df'))
 
+    @skip_stext
+    def test_string_stext(self):
+        p = StringHTMLProperty(self.client, 'test', '1', None, 'test', u2s(u'A string with [email protected] *embedded* \u00df'))
+        if StructuredText:
+            self.assertEqual(p.stext(), u2s(u'<p>A string with <a href="mailto:[email protected]">[email protected]</a> <em>embedded</em> \u00df</p>\n'))
+        else:
+            self.assertEqual(p.stext(), u2s(u'A string with <a href="mailto:[email protected]">[email protected]</a> *embedded* \u00df'))
+
     def test_string_field(self):
         p = StringHTMLProperty(self.client, 'test', '1', None, 'test', 'A string <b> with [email protected] embedded &lt; html</b>')
         self.assertEqual(p.field(), '<input name="test1@test" size="30" type="text" value="A string &lt;b&gt; with [email protected] embedded &amp;lt; html&lt;/b&gt;">')