def METHOD_NAME():
    client = boto3.client("forecast", region_name=region)
    dataset_arn = f"arn:aws:forecast:{region}:{ACCOUNT_ID}:dataset-group/name"
    with pytest.raises(ClientError) as exc:
        client.create_dataset_group(
            DatasetGroupName="name", Domain="CUSTOM", DatasetArns=[dataset_arn]
        )
    assert exc.value.response["Error"]["Code"] == "InvalidInputException"
    assert exc.value.response["Error"]["Message"] == (
        f"Dataset arns: [{dataset_arn}] are not found"
    )