How to use the conllu.models.TokenTree function in conllu

def test_tree_without_id(self):
        tree = TokenTree(token={"form": "hej", "deprel": "nmod"}, children=[])
        with self.assertRaises(ParseException):
            capture_print(tree.print_tree)

def test_missing_id(self):
        tree = TokenTree(token={"form": "hej"}, children=[])
        with self.assertRaises(ParseException):
            tree.serialize()

def test_eq(self):
        metadata = {"meta": "data"}

        tokentree1 = TokenTree(token={"id": 1}, children=[TokenTree(token={"id": 2}, children=[])])
        tokentree1.metadata = metadata

        tokentree2 = TokenTree(token={"id": 1}, children=[])
        self.assertNotEqual(tokentree1, tokentree2)

        tokentree2.metadata = metadata
        self.assertNotEqual(tokentree1, tokentree2)

        tokentree2.children = [TokenTree(token={"id": 2}, children=[])]
        self.assertEqual(tokentree1, tokentree2)

def test_tree_without_deprel(self):
        tree = TokenTree(token={"id": 1, "form": "hej"}, children=[])
        with self.assertRaises(ParseException):
            capture_print(tree.print_tree)

def test_simple_tree(self):
        tokenlist = TokenList([
            Token([("id", 2), ("form", "dog"), ("head", 0)]),
            Token([("id", 1), ("form", "a"), ("head", 2)]),
        ])
        tree = TokenTree(
            token=Token([("id", 2), ("form", "dog"), ("head", 0)]),
            children=[TokenTree(
                token=Token([("id", 1), ("form", "a"), ("head", 2)]),
                children=[]
            )]
        )
        self.assertTreeEqual(tokenlist.to_tree(), tree)

def test_metadata(self):
        tree = TokenTree(token={"id": 1, "form": "hej"}, children=[])
        metadata = {"meta": "data"}
        tree.set_metadata(metadata)
        self.assertEqual(tree.metadata, metadata)

        tree = TokenTree(token={"id": 1, "form": "hej"}, children=[], metadata={"meta": "data"})
        self.assertEqual(tree.metadata, metadata)

def test_removes_negative_nodes(self):
        tokenlist = TokenList([
            Token([("id", 2), ("form", "dog"), ("head", 0)]),
            Token([("id", 1), ("form", "a"), ("head", 2)]),
            Token([("id", 3), ("form", "😍"), ("head", -1)]),
        ])
        tree = TokenTree(
            token=Token([("id", 2), ("form", "dog"), ("head", 0)]),
            children=[TokenTree(
                token=Token([("id", 1), ("form", "a"), ("head", 2)]),
                children=[]
            )]
        )
        self.assertTreeEqual(tokenlist.to_tree(), tree)

def test_eq(self):
        metadata = {"meta": "data"}

        tokentree1 = TokenTree(token={"id": 1}, children=[TokenTree(token={"id": 2}, children=[])])
        tokentree1.metadata = metadata

        tokentree2 = TokenTree(token={"id": 1}, children=[])
        self.assertNotEqual(tokentree1, tokentree2)

        tokentree2.metadata = metadata
        self.assertNotEqual(tokentree1, tokentree2)

        tokentree2.children = [TokenTree(token={"id": 2}, children=[])]
        self.assertEqual(tokentree1, tokentree2)

def _create_tree(head_to_token_mapping, id_=0):
            return [
                TokenTree(child, _create_tree(head_to_token_mapping, child["id"]))
                for child in head_to_token_mapping[id_]
            ]