diff --git a/helpdesk/models.py b/helpdesk/models.py
index 73b2ba7c..ab19c9bd 100644
--- a/helpdesk/models.py
+++ b/helpdesk/models.py
@@ -44,10 +44,9 @@ def format_time_spent(time_spent):
 
 
 class EscapeHtml(Extension):
-    def extendMarkdown(self, md, md_globals=None):
-        # del md.preprocessors['html_block']
-        # del md.inlinePatterns['html']
-        pass
+    def extendMarkdown(self, md):
+        md.preprocessors.deregister('html_block')
+        md.inlinePatterns.deregister('html')
 
 
 def get_markdown(text):
diff --git a/helpdesk/tests/test_markdown.py b/helpdesk/tests/test_markdown.py
new file mode 100644
index 00000000..7eeccb02
--- /dev/null
+++ b/helpdesk/tests/test_markdown.py
@@ -0,0 +1,44 @@
+
+from django.test import SimpleTestCase
+from helpdesk.models import get_markdown
+
+
+class MarkDown(SimpleTestCase):
+    """Test work Markdown functional"""
+    def test_markdown_html_tab(self):
+        expected_value = "<p>&lt;div&gt;test&lt;div&gt;</p>"
+        input_value = "<div>test<div>"
+        output_value = get_markdown(input_value)
+        self.assertEqual(output_value, expected_value)
+
+    def test_markdown_nl2br(self):
+        """ warning, after Line 1 - two withespace, esle did't work"""
+        expected_value = "<p>Line 1<br />\n                    Line 2</p>"
+        input_value = """Line 1  
+                    Line 2"""
+        output_value = get_markdown(input_value)
+        self.assertEqual(output_value, expected_value)
+
+    def test_markdown_fenced_code(self):
+        expected_value = '<h1>Title</h1>\n<pre><code class="language-python"># import os\n</code></pre>'
+        input_value = """
+# Title
+
+```python
+# import os
+```
+        """
+        output_value = get_markdown(input_value)
+        self.assertEqual(output_value, expected_value)
+
+    def test_markdown_link_correct_protokol(self):
+        expected_value = '<p><a href="http://www.yahoo.ru">www.google.com</a></p>'
+        input_value = "[www.google.com](http://www.yahoo.ru)"
+        output_value = get_markdown(input_value)
+        self.assertEqual(output_value, expected_value)
+
+    def test_markdown_link_not_correct_protokol(self):
+        expected_value = '<p><a href="//www.yahoo.ru">www.google.com</a></p>'
+        input_value = "[www.google.com](aaaa://www.yahoo.ru)"
+        output_value = get_markdown(input_value)
+        self.assertEqual(output_value, expected_value)