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from __future__ import annotations

from airflow.sdk import DAG, TaskGroup


def test_mapped_task_group_id_prefix_task_id():
    def f(z):
        pass

    with DAG(dag_id="d", schedule=None) as dag:
        x1 = dag.task(task_id="t1")(f).expand(z=[])
        with TaskGroup("g"):
            x2 = dag.task(task_id="t2")(f).expand(z=[])

    assert x1.operator.task_id == "t1"
    assert x2.operator.task_id == "g.t2"

    assert dag.get_task("t1") == x1.operator
    assert dag.get_task("g.t2") == x2.operator
