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This is a bug in Django:
assertInHTML(needle, haystack)
has the following behaviour
assertInHTML('<p>a</p>', '<div><p>a</p><p>b</p></div>')
passes: clearly correct
assertInHTML('<p>a</p><p>b</p>', '<p>a</p><p>b</p>')
passes: possibly correct
assertInHTML('<p>a</p><p>b</p>', '<div><p>a</p><p>b</p></div>')
fails with an assertion error.
The problem occurs when the needle does not have a unique root element that wraps everything else.
The proposed fix (which has been languishing for some time!) is to raise an exception if you try to do this – i.e., the needle must have a HTML tag that wraps everything inside it.
Source:stackexchange.com