From db31fa66e82d097c2378734950bd3066acdae397 Mon Sep 17 00:00:00 2001
From: Leonard Richardson <leonardr@segfault.org>
Date: Wed, 21 Aug 2019 18:50:43 -0400
Subject: Copying a Tag preserves information that was originally obtained from
    the TreeBuilder used to build the original Tag. [bug=1838903]

---
 bs4/tests/test_tree.py | 25 +++++++++++++++++++++++++
 1 file changed, 25 insertions(+)

(limited to 'bs4/tests/test_tree.py')

diff --git a/bs4/tests/test_tree.py b/bs4/tests/test_tree.py
index c995c46..7d8da01 100644
--- a/bs4/tests/test_tree.py
+++ b/bs4/tests/test_tree.py
@@ -1490,6 +1490,31 @@ class TestPersistence(SoupTest):
         self.assertEqual(u"<p> </p>", unicode(copy))
         self.assertEqual(encoding, copy.original_encoding)
 
+    def test_copy_preserves_builder_information(self):
+
+        tag = self.soup('<p></p>').p
+
+        # Simulate a tag obtained from a source file.
+        tag.sourceline = 10
+        tag.sourcepos = 33
+        
+        copied = tag.__copy__()
+
+        # The TreeBuilder object is no longer availble, but information
+        # obtained from it gets copied over to the new Tag object.
+        self.assertEqual(tag.sourceline, copied.sourceline)
+        self.assertEqual(tag.sourcepos, copied.sourcepos)
+        self.assertEqual(
+            tag.can_be_empty_element, copied.can_be_empty_element
+        )
+        self.assertEqual(
+            tag.cdata_list_attributes, copied.cdata_list_attributes
+        )
+        self.assertEqual(
+            tag.preserve_whitespace_tags, copied.preserve_whitespace_tags
+        )
+        
+        
     def test_unicode_pickle(self):
         # A tree containing Unicode characters can be pickled.
         html = u"<b>\N{SNOWMAN}</b>"
-- 
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