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443e3ef90b
Old xml.etree.cElementTree versions (python2) reorder the attributes
while recent xml.etree.cElementTree versions (python3) keep the
document order.
Example:
python3:
>>> ET.tostring(ET.fromstring('<foo y="foo" x="bar"/>'))
b'<foo y="foo" x="bar" />'
>>>
python2:
>>> ET.tostring(ET.fromstring('<foo y="foo" x="bar"/>'))
'<foo x="bar" y="foo" />'
>>>
So far, the testsuite compared two serialized XML documents via a simple
string comparison. For instance via,
self.assertEqual(actual_serialized_xml, expected_serialized_xml) where
the expected_serialized_xml is, for instance, a hardcoded str. Obviously,
this would only work for python2 or python3.
In order to support both python versions, we first parse both XML
documents and then compare the corresponding trees (this is OK because
we do not care about comments etc.).
A related issue is the way how the testsuite compares data that is "send"
to the API. So far, this was a plain bytes comparison. Again, this won't
work in case of XML documents (see above). Moreover, we have currently
no notion to "indicate" that the transmitted data is an XML document.
As a workaround, we keep the plain bytes comparison and in case it fails,
we try an xml comparison (see above) as a last resort. Strictly speaking,
this is "wrong" (there might be cases (in the future) where we want to
ensure that the transmitted XML data is bit identical to a fixture file)
but a reasonable comprise for now.
Fixes: #751 ("[python3.8] Testsuite fails")