try to get more info on failing test

looks like m is not being formatted for markdown2 test case. No idea
why. Trying to make output more verbose to figure out what's happening.

pip in ci reports version 2.4.2 of markdown2 according to:

https://app.travis-ci.com/github/roundup-tracker/roundup/jobs/568309619

same version I run locally with python 3.6.9. Fails in CI on 3.6, 3.8,
3.10.4.

python 2.7 works on with version 2.3.10 of markdown2

Author: rouilj

test/test_templating.py

@@ -714,7 +714,12 @@ def test_string_markdown_code_block_attribute(self):
         elif type(self) == MarkdownTestCase:
             self.assertEqual(m.replace('\n\n','\n'), '<p>embedded code block &lt;pre&gt;</p>\n<pre><code class="language-python">line 1\nline 2\n</code></pre>\n<p>new &lt;/pre&gt; paragraph</p>')
         else:
-            self.assertEqual(m.replace('\n\n', '\n'), '<p>embedded code block &lt;pre&gt;</p>\n<div class="codehilite"><pre><span></span><code><span class="n">line</span> <span class="mi">1</span>\n<span class="n">line</span> <span class="mi">2</span>\n</code></pre></div>\n<p>new &lt;/pre&gt; paragraph</p>')
+            test_output = m.replace('\n\n', '\n')
+            expected_result = '<p>embedded code block &lt;pre&gt;</p>\n<div class="codehilite"><pre><span></span><code><span class="n">line</span> <span class="mi">1</span>\n<span class="n">line</span> <span class="mi">2</span>\n</code></pre></div>\n<p>new &lt;/pre&gt; paragraph</p>g'
+            if  test_output != expected_result:
+                print("test_output:", test_output, file=sys.stderr)
+                print("expected_result:", expected_result, file=sys.stderr)
+            self.assertEqual( test_output, expected_result)
 
     def test_markdown_return_text_on_exception(self):
         ''' string is invalid markdown. missing end of fenced code block '''