Add test for variable comments

Expand the comment test to capture the comments found on variables in a
class.

Author: josephsnyder

unittests/test_comments.py

@@ -51,6 +51,11 @@ def test(self):
         self.assertIn("comment", dir(tconstructor))
         self.assertEqual(["/** doc comment */"], tconstructor.comment.text)
 
+        for indx, cmt in enumerate(['//! mutable field comment',"/// bit field comment"]):
+            tvariable = tclass.variables()[indx]
+            self.assertIn("comment", dir(tvariable))
+            self.assertEqual([cmt], tvariable.comment.text)
+
 def create_suite():
     suite = unittest.TestSuite()
     suite.addTest(unittest.makeSuite(Test))