def METHOD_NAME():
    """
    Test element tree interface.
    >>> element = ET.Element("tag", key="value")
    >>> tree = ET.ElementTree(element)
    Make sure all standard element methods exist.
    >>> check_method(element.append)
    >>> check_method(element.insert)
    >>> check_method(element.remove)
    >>> check_method(element.getchildren)
    >>> check_method(element.find)
    >>> check_method(element.findall)
    >>> check_method(element.findtext)
    >>> check_method(element.clear)
    >>> check_method(element.get)
    >>> check_method(element.set)
    >>> check_method(element.keys)
    >>> check_method(element.items)
    >>> check_method(element.getiterator)
    Basic method sanity checks.
    >>> serialize(ET, element) # 1
    '<tag key="value" />'
    >>> subelement = ET.Element("subtag")
    >>> element.append(subelement)
    >>> serialize(ET, element) #  2
    '<tag key="value"><subtag /></tag>'
    >>> element.insert(0, subelement)
    >>> serialize(ET, element) # 3
    '<tag key="value"><subtag /><subtag /></tag>'
    >>> element.remove(subelement)
    >>> serialize(ET, element) # 4
    '<tag key="value"><subtag /></tag>'
    >>> element.remove(subelement)
    >>> serialize(ET, element) # 5
    '<tag key="value" />'
    >>> element.remove(subelement)
    Traceback (most recent call last):
    ValueError: list.remove(x): x not in list
    >>> serialize(ET, element) # 6
    '<tag key="value" />'
    """