Python: Add test for XMLPullParser

But handling this in a nice way will require some restructuring

Author: RasmusWL

python/ql/test/experimental/library-tests/frameworks/XML/xml_etree.py

@@ -33,6 +33,12 @@
 parser.feed(data=x) # $ input=x vuln='Billion Laughs' vuln='Quadratic Blowup'
 parser.close()
 
+# manual use of feed method on XMLPullParser
+parser = xml.etree.ElementTree.XMLPullParser()
+parser.feed(x) # $ MISSING: input=x vuln='Billion Laughs' vuln='Quadratic Blowup'
+parser.feed(data=x) # $ MISSING: input=x vuln='Billion Laughs' vuln='Quadratic Blowup'
+parser.close()
+
 # note: it's technically possible to use the thing wrapper func `fromstring` with an
 # `lxml` parser, and thereby change what vulnerabilities you are exposed to.. but it
 # seems very unlikely that anyone would do this, so we have intentionally not added any