[1.3.X] Fixed #17908 -- Made some `contrib.markup` tests be skipped so they don't fail on old versions of Markdown. Thanks to Preston Holmes for the patch.

Backport of r17749 from trunk.

git-svn-id: http://code.djangoproject.com/svn/django/branches/releases/1.3.X@17750 bcc190cf-cafb-0310-a4f2-bffc1f526a37

django/contrib/markup/tests.py

@@ -14,6 +14,7 @@ except ImportError:
 
 try:
     import markdown
+    markdown_version = getattr(markdown, "version_info", 0)
 except ImportError:
     markdown = None
 
@@ -38,7 +39,6 @@ Paragraph 2 with a link_
 
 .. _link: http://www.example.com/"""
 
-
     @unittest.skipUnless(textile, 'texttile not installed')
     def test_textile(self):
         t = Template("{{ textile_content|textile }}")
@@ -60,14 +60,14 @@ Paragraph 2 with a link_
         pattern = re.compile("""<p>Paragraph 1\s*</p>\s*<h2>\s*An h2</h2>""")
         self.assertTrue(pattern.match(rendered))
 
-    @unittest.skipUnless(markdown, 'markdown no installed')
+    @unittest.skipUnless(markdown and markdown_version >= (2,1), 'markdown >= 2.1 not installed')
     def test_markdown_attribute_disable(self):
         t = Template("{% load markup %}{{ markdown_content|markdown:'safe' }}")
         markdown_content = "{@onclick=alert('hi')}some paragraph"
         rendered = t.render(Context({'markdown_content':markdown_content})).strip()
         self.assertTrue('@' in rendered)
 
-    @unittest.skipUnless(markdown, 'markdown no installed')
+    @unittest.skipUnless(markdown and markdown_version >= (2,1), 'markdown >= 2.1 not installed')
     def test_markdown_attribute_enable(self):
         t = Template("{% load markup %}{{ markdown_content|markdown }}")
         markdown_content = "{@onclick=alert('hi')}some paragraph"