import xml.etree.ElementTree as ET

##   Documentation for XMLParser:
##      class xml.etree.ElementTree.XMLParser(*, target=None, encoding=None)
##      ...If target is omitted, the standard TreeBuilder is used.
##
##   Testing results:
##      Success if target omitted or passed as standard TreeBuilder
##      Fails if target is explicity passed as None

trivialXml = '<root></root>'

# Test:  Target omitted
# Success
parser = ET.XMLParser()
parser.feed(trivialXml)
root = parser.close()
print(root) # root is <Element 'root'>

# Test:  Target explicity set to standard TreeBuilder
# Success
parser = ET.XMLParser(target=ET.TreeBuilder())
parser.feed(trivialXml)
root = parser.close()
print(root) # root is <Element 'root'>

# Test:  Target explicitly set to None
# Fail
parser = ET.XMLParser(target=None)
parser.feed(trivialXml)
root = parser.close()
print(root) # root is None