def save(self, filename=None):
        filename = Path(filename) if filename is not None else self.filename
        with filename.open("w") as f:
            f.write(self.yaml)
def setUp(self):
        super().setUp()

        self.project1 = self.env["project.project"].create({"name": "Project 1"})
        self.task1 = self.env["project.task"].create(
            {"name": "name1", "project_id": self.project1.id}
        )
        self.subtask1 = self.env["project.task"].create(
            {"name": "2", "project_id": self.project1.id, "parent_id": self.task1.id}
        )
        self.subtask2 = self.env["project.task"].create(
            {"name": "3", "project_id": self.project1.id, "parent_id": self.task1.id}
        )