def test_subelement():
parent = Element("parent")
child0 = SubElement(parent, "child0")
assert parent[0].tag == "child0"
assert parent[0].attrib == {}
assert parent[0].text is None
assert parent[0].tail is None
child1 = SubElement(parent, "child1", dict(a=0, b=1))
assert parent[1].tag == "child1"
assert parent[1].attrib == {"a": 0, "b": 1}
assert parent[1].text is None
assert parent[1].tail is None
child2 = SubElement(parent, "child2", a=0, b=1)
assert parent[2].tag == "child2"
assert parent[2].attrib == {"a": 0, "b": 1}
assert parent[2].text is None
assert parent[2].tail is None
child3 = SubElement(parent, "child3", dict(a=0, b=1), c=2)
assert parent[3].tag == "child3"
assert parent[3].attrib == {"a": 0, "b": 1, "c": 2}
assert parent[3].text is None
assert parent[3].tail is None
assert parent.getchildren() == [child0, child1, child2, child3]
def test_element_children():
parent = Element("parent")
parent.append(Element("child0"))
parent.append(Element("child1"))
parent.append(Element("child2"))
parent.append(Element("child3"))
assert len(parent) == 4
assert parent[0].tag == "child0"
assert parent[3].tag == "child3"
parent[3] = Element("child4")
assert parent[3].tag == "child4"
del parent[3]
assert len(parent) == 3
child0, child1 = parent[:2]
assert child0.tag == "child0"
assert child1.tag == "child1"
parent[:2] = Element("firstone"), Element("firsttwo")
assert parent[0].tag == "firstone"
assert parent[1].tag == "firsttwo"
del parent[:2]
assert len(parent) == 1
print parent[0].tag
assert parent[0].tag == "child2"
parent.insert(0, Element("insert1"))
parent.insert(0, Element("insert0"))
assert parent[0].tag == "insert0"
assert parent[1].tag == "insert1"
assert len(parent) == 3
child = parent[-1]
parent.remove(child)
assert len(parent) == 2
children = parent.getchildren()
assert len(children) == 2
assert children[0].tag == "insert0"
assert children[1].tag == "insert1"
parent.clear()
assert parent.tag == "parent"
assert len(parent) == 0
