How to use the pipupgrade.tree.Node function in pipupgrade

def test_node():
    tree1 = Node("foo")
    assert tree1.empty == True
    assert tree1 == Node("foo")

    assert str(tree1) == ""

    assert tree1.render() == \
"""\
foo
"""

    tree2 = Node("foo", children = ["bar", "baz"])
    assert tree2.parent == None
    assert tree2 != Node("foo", children = ["bar", "baz", "boo"])
    assert Node("foo", children = ["bar", "baz"]) \
        == Node("foo", children = ["bar", "baz"])
    assert not Node("foo", children = ["bar", "baz"]) \
            == Node("foo", children = ["baz", "boo"])

assert tree1.empty == True
    assert tree1 == Node("foo")

    assert str(tree1) == ""

    assert tree1.render() == \
"""\
foo
"""

    tree2 = Node("foo", children = ["bar", "baz"])
    assert tree2.parent == None
    assert tree2 != Node("foo", children = ["bar", "baz", "boo"])
    assert Node("foo", children = ["bar", "baz"]) \
        == Node("foo", children = ["bar", "baz"])
    assert not Node("foo", children = ["bar", "baz"]) \
            == Node("foo", children = ["baz", "boo"])

    assert tree2.render() == \
"""\
foo
  bar
  baz
"""

    assert tree2.render(indent = 4) == \
"""\
foo
    bar
    baz
"""

bar
    baz
"""

    assert tree2.render(indent = 4, formatter = lambda x: "* %s" % x) == \
"""\
* foo
    * bar
    * baz
"""

    assert      tree2.find(lambda x: x.obj == "foo")
    assert      tree2.find(lambda x: x.obj == "bar")
    assert not  tree2.find(lambda x: x.obj == "foobaz")

    tree3 = Node("foo")
    tree3.add_children(["bar", "baz"])

    tree4           = Node("foo")
    tree4.children  = ["bar", "baz"]

    with pytest.raises(TypeError):
        tree4.children = "bar"

def test_node():
    tree1 = Node("foo")
    assert tree1.empty == True
    assert tree1 == Node("foo")

    assert str(tree1) == ""

    assert tree1.render() == \
"""\
foo
"""

    tree2 = Node("foo", children = ["bar", "baz"])
    assert tree2.parent == None
    assert tree2 != Node("foo", children = ["bar", "baz", "boo"])
    assert Node("foo", children = ["bar", "baz"]) \
        == Node("foo", children = ["bar", "baz"])
    assert not Node("foo", children = ["bar", "baz"]) \
            == Node("foo", children = ["baz", "boo"])

    assert tree2.render() == \
"""\
foo
  bar
  baz
"""

    assert tree2.render(indent = 4) == \
"""\

assert tree2.render(indent = 4, formatter = lambda x: "* %s" % x) == \
"""\
* foo
    * bar
    * baz
"""

    assert      tree2.find(lambda x: x.obj == "foo")
    assert      tree2.find(lambda x: x.obj == "bar")
    assert not  tree2.find(lambda x: x.obj == "foobaz")

    tree3 = Node("foo")
    tree3.add_children(["bar", "baz"])

    tree4           = Node("foo")
    tree4.children  = ["bar", "baz"]

    with pytest.raises(TypeError):
        tree4.children = "bar"

def test_node():
    tree1 = Node("foo")
    assert tree1.empty == True
    assert tree1 == Node("foo")

    assert str(tree1) == ""

    assert tree1.render() == \
"""\
foo
"""

    tree2 = Node("foo", children = ["bar", "baz"])
    assert tree2.parent == None
    assert tree2 != Node("foo", children = ["bar", "baz", "boo"])
    assert Node("foo", children = ["bar", "baz"]) \
        == Node("foo", children = ["bar", "baz"])
    assert not Node("foo", children = ["bar", "baz"]) \

def _get_dependency_tree_for_package(package, parent = None, sync = False,
    jobs = 1):
    if package.name not in _TREE_DICT:
        logger.info("Building dependency tree for package: %s..." % package)

        tree            = TreeNode(package, parent = parent)

        dependencies    = [ ]
        
        with parallel.no_daemon_pool(processes = jobs) as pool:
            dependencies = pool.imap_unordered(
                partial(
                    _create_package, **{
                        "sync": sync
                    }
                ),
                _INFO_DICT[package.name]["dependencies"]
            )

        with parallel.no_daemon_pool(processes = jobs) as pool:
            children = pool.imap_unordered(
                partial(

try:
					_db.query("""
						UPDATE `tabPackage`
							SET latest_version = '%s', home_page = '%s', _updated_at = '%s'
						WHERE
							name = '%s'
					""" % (self.latest_version, self.home_page, datetime.now(), self.name))
				except db.OperationalError as e:
					logger.warn("Unable to update package name. %s" % e)
			else:
				logger.info("Using cached info for package %s." % self)

				self.latest_version = res["latest_version"]
				self.home_page      = res["home_page"]

		self.dependency_tree = TreeNode(self)