1 files changed, 17 insertions, 0 deletions
diff --git a/bs4/testing.py b/bs4/testing.py
index 9f12e8d..3e8d15b 100644
--- a/bs4/testing.py
+++ b/bs4/testing.py
@@ -790,6 +790,23 @@ Hello, world!
         soup = self.soup(BAD_DOCUMENT)
         self.linkage_validator(soup)
 
+    def test_tracking_line_numbers(self):
+        # In general, TreeBuilders do not keep track of
+        # line numbers from the original markup. Even if you
+        # ask for line numbers, we don't have 'em.
+        #
+        # This means that if you have a tag like <lineno> or <offset>,
+        # tag.lineno will find it rather than giving you a numeric
+        # answer.
+        #
+        # See HTMLParserTreeBuilderSmokeTest for a situation
+        # where the parser _does_ keep track of the line numbers.
+        soup = self.soup(
+            "\n   <p>\n\n<lineno>\n<b>text</b></lineno><offset></p>",
+            store_line_numbers=True
+        )
+        self.assertEqual("lineno", soup.p.lineno.name)
+        self.assertEqual("offset", soup.p.offset.name)
 
 class XMLTreeBuilderSmokeTest(object):