[tests] Try to exercize pygments transforms code paths

test/unittest_transforms.py

@@ -20,11 +20,13 @@ from logilab.common.testlib import TestCase, unittest_main
 
 from logilab.mtconverter.engine import TransformEngine
 from logilab.mtconverter import TransformData, TransformError, \
-     register_base_transforms, register_pil_transforms
+     register_base_transforms, register_pil_transforms, \
+     register_pygments_transforms
 
 ENGINE = TransformEngine()
 register_base_transforms(ENGINE)
 register_pil_transforms(ENGINE)
+_pygments_available = register_pygments_transforms(ENGINE)
 
 import logilab.mtconverter as mtc
 import os
@@ -101,6 +103,14 @@ r2MAoIO1DSsuM23SzgmqubGJEZuSRWhR
         converted = ENGINE.convert(data, 'text/plain').decode().strip()
         self.assertEqual(converted, u'hello')
 
+    def test_python_to_html(self):
+        if not _pygments_available:
+            self.skipTest('pygments is not installed')
+        with open(__file__, 'rb') as fobj:
+            data = TransformData(fobj.read(), 'text/x-python3', 'latin1')
+        converted = ENGINE.convert(data, 'text/html').decode()
+        self.assertTrue(converted.startswith('<div class="highlight">'))
+
     def tearDown(self):
         for ext in ('pdf', 'aux', 'log'):
             try: