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-rw-r--r--docs/topics/testing/tools.txt3
1 files changed, 3 insertions, 0 deletions
diff --git a/docs/topics/testing/tools.txt b/docs/topics/testing/tools.txt
index e656f89124..62b37bb63b 100644
--- a/docs/topics/testing/tools.txt
+++ b/docs/topics/testing/tools.txt
@@ -1641,6 +1641,9 @@ your test suite.
syntax differences. When invalid XML is passed in any parameter, an
``AssertionError`` is always raised, even if both string are identical.
+ XML declaration and comments are ignored. Only the root element and its
+ children are compared.
+
Output in case of error can be customized with the ``msg`` argument.
.. method:: SimpleTestCase.assertXMLNotEqual(xml1, xml2, msg=None)